From majordomo-owner Tue Oct  2 18:47:54 2001
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Message-ID: <3BB9FDBB.E8AA5570@erg.abdn.ac.uk>
Date: Tue, 02 Oct 2001 18:47:38 +0100
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Organization: ERG
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To: "Chu, Narisa (HT-EX)" <NChu@GI.com>, ip-dvb@erg.abdn.ac.uk
Subject: IP over DVB: Proposals for SI data - LLC - MAC ?
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The following reference has been added to the web site:

http://www.erg.abdn.ac.uk/users/gorry/ip-dvb refs/IP_DVB_descr-MBCS-Oct2001.doc

From majordomo-owner Wed Oct  3 19:08:28 2001
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From: Adrian Jelffs <adrian.jelffs@skystream.com>
To: "'ip-dvb@erg.abdn.ac.uk'" <ip-dvb@erg.abdn.ac.uk>
Subject: RE: First draft for discussion at DVB
Date: Wed, 3 Oct 2001 11:04:53 -0700 
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Hi Gorry,

Just trying to understand a little more about the situation!

Are you going to the CM meeting? 
Who will be making the presentation? 
Do you think this is going to be the only presentation on this topic?
Do you know of any other presentations?
Do you have an agenda for the meeting?

Cheers

Adrian

-----Original Message-----
From: Gorry Fairhurst [mailto:gorry@erg.abdn.ac.uk]
Sent: Tuesday, September 25, 2001 6:48 AM
To: ip-dvb@erg.abdn.ac.uk
Subject: First draft for discussion at DVB



The DVB Commercial Module (CM) meet on 11th October, we need
to ensure the commercial and technical modules in DVB are
aware of this list, and also seek there advice on the
future way things should develop.   

It would be very helpful to jointly prepare a document to come
before this meeting to present the case for the existence of
this mail group and the work we intend to do.  The future
of the mailing list depends on finding a suitable relationship
with DCB technical groups and other such organizations. I'd
like to suggest we co-author a document to bring before this
working group.


The following is a suggested draft outline, as offered by 
Keith Fenwick, please do suggest text, comments, or issues 
to help with
this....


best wishes,

Gorry Fairhurst

-----



Transporting IP over Satellite

Contribution to DVB-TM Meeting of 11th October 2001 presented by 
Keith Fenwick (Hughes Network Systems) and prepared by ......

<< to add list of contributors>>

Summary

This note addresses the problems of carrying IP data over DVB, 
reports on work being proposed in the Internet Engineering 
Task Force (IETF) to improve transport efficiency and proposes 
that DVB should be party to this work.

<<< What is the correct form of words for a BoF? >>>>

Background

The need for DVB systems to carry data has already been recognised. 
It has also been shown that problems exist with the current MPE 
specification, which led to an RFI being issued by DVB-IPI AHG.  
This RFI requested information on current deficiencies (with any 
solutions) for the current MPE specification.  The responses to 
the RFI are now being handled by the DVB-SI AHG.  The majority 
of the RFI responses have been concerned with the signalling of 
IP address information to the terminals.

In addition, the expertise of DVB members tends to be in delivering 
traditional broadcast services and not data delivery using IP. 


Using DVB Systems to Carry IP Traffic

DVB systems need to carry IP traffic to provide true multimedia and 
interactive services. Multi-Protocol Encapsulation has the advantage 
that it is an existing ETSI standard but has some disadvantages 
for IP services using IPv4 and IPv6 which include:
1. It may waste up to 15% capacity in unnecessary overheads (MPE Tax).
2. It is overly complex, incurring significant per-packet processing
overhead.
3. It contains many options, which in practice are not required for 
many IP services, and complicate interoperability between vendors.
4. Some desirable functionality is missing, including: address 
resolution of IP addresses to MPEG2-Transport Stream (TS), Packet 
ID (PIDs), support for IPv4 and IPv6 multicast.
5. Some additional features are desirable, e.g. SNMP support.

Potential Solutions

At present, only outline solutions have been proposed, including a
leaner encapsulation.

>>> Details to be added. <<<

Recommendations

DVB supports and contributes to the work being proposed within IETF to
take 
advantage of the knowledge within that group and to align with other
transport 
systems, e.g. IP over Cable Data Networks.

>>> Details to be added. <<<

From majordomo-owner Thu Oct  4 10:37:00 2001
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Message-ID: <3BBC2DB2.72C3142F@erg.abdn.ac.uk>
Date: Thu, 04 Oct 2001 10:36:48 +0100
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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Subject: Re: First draft for discussion at DVB
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Adrian, you ask important questions, and I'd like to get a sounding
from the rest of this list too.

IF OTHER PEOPLE HAVE VIEWS / INFORMATION - please tell the list.

Adrian Jelffs wrote:
> 
> Hi Gorry,
> 
> Just trying to understand a little more about the situation!
> 
> Are you going to the CM meeting?

I (gorry) do not intend to be at the Commercial Module meeting.

> Who will be making the presentation?

Keith Fenwick kindly prepared the draft for the DVB-CM. At that
time he did volunteer to present a composite document representing
our joint case. --- All contributions welcome from the list,
I'll post a revised copy today with the feedback so far.

> Do you think this is going to be the only presentation on this topic?

If there were to be several, I hope that those in favour of the composite
document would try to avoid conflicting presentations.

> Do you know of any other presentations?

Not yet - does anyone else know?

> Do you have an agenda for the meeting?
> 

The meeting I gather is postponed until the 12th.
Is anybody aware of relevent issues being raised?

> Cheers
> 
> Adrian
> 

---------------

A second issue concerns a question over WHICH IS THE BEST FORUM?

It has more recently been suggested that document should be 
sent to the DVB-TM, not the DVB-CM. Now that DVB is aware that
problems exist, it may be more important to bring the technical
issues to the TM, where they may meet a more appropriate audience?

Any views?

The 44th TM meeting is on 21-22 November.

N.B.
**IF** there is a desire to advance to raise this as a BoF within the 
IETF this year, we need to give notice to the relevant IETF area
Director 
by (approx) the end of October. BoF sessions intended to form
Working Groups are limited to a few each meeting. Of course,the IETF
meets three times a year - so there will be other opportunites next year.

<<snip>>

From majordomo-owner Thu Oct  4 13:33:13 2001
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Date: Thu, 04 Oct 2001 13:32:40 +0100
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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Subject: A presentation on how the IETF operates.
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I include a presentation which I have put together on the working of the IETF,
which I prepared for a course I am giving next month. I hope it provides a
high level over-view of the process.

I thought this may also be useful to those on the list who are still learning
about how the IETF operates.

Attached file in Adobe Acrobat PDF

Best wishes,

Gorry
--------------468A374C32422C0434398C0B
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--------------468A374C32422C0434398C0B--


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Date: Thu, 04 Oct 2001 15:02:31 +0100
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DRAFT TEXT  4th Oct 2001


This is the second draft of the document being prepared to come
before DVB to present the case for the existence of
this mail group and the work we intend to do.  The future
of the mailing list depends on finding a suitable relationship
with DVB technical module and other such organizations. 

Contributions of text  and/or comments from all on the list are welcome.
Please send to:

ip-dvb@erg.abdn.ac.uk

---------

Transporting IP over Satellite

Contribution to DVB-?? Meeting of ???? presented by Keith Fenwick
(Hughes Network Systems) and prepared by Keith Fenwick, Gorry Fairhurst
(University of Aberdeen), Adrian Jelffs (Skystream),

<<< add more contributors as text received>>> 

Summary

This note addresses the problems of carrying IP data over DVB, reports
on work being proposed for study in the Internet Engineering Task Force
(IETF) to improve transport efficiency and proposes that DVB should be
party to this work.

Background

The need for DVB systems to carry data has already been recognised. It
has also been shown that problems exist with the current MPE
specification, which led to an RFI being issued by DVB-IPI AHG.  This
RFI requested information on current deficiencies (with any solutions)
for the current MPE specification.  The responses to the RFI are now
being handled by the DVB-SI AHG.  <<INSERT REFERENCE TO RFI>> The
majority of the RFI responses have been concerned with the signalling of
information to resolve the DCV service from the IP address.
In addition, the expertise of DVB members tends to be in delivering
traditional broadcast services and not data delivery using IP. 
In contrast, the Internet Engineering Task Force (IETF) has a
long-standing tradition of developing  high quality, open protocols
which have a long life-time of use. Examples of work in this area
include IP over Ethernet, IP over ATM, IP over Firewire, IP over Cable
Data Networks, TCP over Satellite. The IETF also provides a peer-review
of all documents issued, which ensures that the document is examined by
experts from applications, operations, routing, enetworking, security
etc. However, the scope of IETF is normally limited only to the services
provided to the IP network layer and the issues concerning IP
networking. 

Using DVB Systems to Carry IP Traffic

DVB systems need to carry IP traffic to provide true multimedia and
interactive services. In addition, some DVB links may support only IP
services.  Multi-Protocol Encapsulation (MPE) has the advantage that it
is an existing ETSI standard, which has been widely implemented.  It is
therefore likely to exist as such for the foreseeable future.
MPE however has some disadvantages when  used for services supporting
IPv4 and IPv6 traffic which include:
1. It wastes up to 15% capacity in unnecessary overheads (MPE Tax). A
more efficient scheme may eliminate may of the headers present in MPE,
since they are not required for IP services.
2. It is too complex, incurring significant per-packet processing
overhead. A simpler more efficient scheme may significantly reduce
receiver processing costs.
3. It contains many options, which in practice are not required for many
IP services. The extra options reduce the inter-operability between
vendor implementations.
4. Some desirable functionality is missing, including: address
resolution of IP addresses to MPEG2-Transport Stream (TS), Packet ID
(PIDs), support for IPv4 and IPv6 multicast. The use of header
compression may also be desirable in some circumstances.
5. Some additional features are desirable, e.g. SNMP support.


Potential Solutions

At present, only outline solutions have been proposed, including a
leaner encapsulation. A leaner encapsulation, offering faster
processing, may also permit a more flexible use of MPEG-2 PIDs.  The
position of the encapulsation form the IP network viewpoint, and its
relationship with the DVB systems stream needs also to be considered to
ensure good and efficient interoperability.

The following principles are suggested for this work:

(i) Minimal overhead.  The proposed encapsulation should minimize
protocol overhead, in terms of the number of additional bytes to be sent
in addition to the IP datagram, and the processing load which is likely
to be envisaged when implementing such schemes. In some cases, the use
of header compression may represent a useful trade-off in increased
processing overhead, but reduced packet header size.

(ii) Robust operation. The encapsulation should rely on the End-to-End
principle when proving reliability. As such, it should minimise the
impact of link failures on the end-to-end transmission. The need for and
appropriate use of ICMP messages needs to be defined.

(iii) Fate Sharing. The encapsulation should not assume it is the only
path from the sender to the receiver.  It should permit alternate paths.
Transparent link fragmentation should be used.

(iv) Minimal set of required options.

Integration with IP Quality of Service (QoS) mechanisms may also need to
be considered.

 >>>> Details to be added. – CONTRIBUTIONS WELCOME <<<
 
 
Recommendations

DVB supports and contributes to the work being proposed within IETF to
take advantage of the knowledge within that group and to align with
other transport systems, e.g. IP over Cable Data Networks.

References

EN 301 192 : Digital Video Broadcasting (DVB); 
DVB specification for data broadcasting 
European Standard (Telecommunications series)

S. Bradner, IETF Working Group Guidelines and Procedures, 
RFC2418 (BCP25 ), September 1998.

Bradner, S., Editor, The Internet Standards Process -- Revision 3, 
RFC 2026 (BCP 9), October 1996.

Hovey, R., and S. Bradner, The Organizations involved in the IETF 
Standards Process, RFC 2028 (BCP 11), October 1996.

<< Add more references received via mailing list >>

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Gorry,

I suggest the following inclusions of reference to the ETSI BSM work in the
text:

> Background
>
> The need for DVB systems to carry data has already been recognised.

The ETSI Broadband Satelilte Multimedia Work Group also focuses work on
broadband satellite data communication, both for DVB and for non-DVB air
interfaces. ETSI BSM is further cooperating also with the DVB-BSS group,
which is outlining requirements for a furture DVB-S format.

> It
> has also been shown that problems exist with the current MPE
> specification, which led to an RFI being issued by DVB-IPI AHG.  This
> RFI requested information on current deficiencies (with any solutions)
> for the current MPE specification...... [and as before]



> Potential Solutions
>
> At present, only outline solutions have been proposed, including a
> leaner encapsulation. A leaner encapsulation, offering faster
> processing, may also permit a more flexible use of MPEG-2 PIDs.  The
> position of the encapulsation form the IP network viewpoint, and its
> relationship with the DVB systems stream needs also to be considered to
> ensure good and efficient interoperability.

It is also possible to envision a minimum encapsulation process that allows
even more optimum use of the spectrum, by segmenting IP packets in
optionally other than ATM (53 byte) or MPEG-TS (188 byte) segments. An
interface between satellite dependent and non-satellite dependent layers is
being considered by ETSI BSM, which may be useful in this respect.

>
> The following principles are suggested for this work:
>
> (iv) Minimal set of required options.

(v) Definition of future proof interface(s) that allows use of 'satelite
optimized' IP over various DVB (ATM, MPEG) or other segmentation schemes,
taking into account issues like adaptive coding and modulation.


> Recommendations
>
> DVB supports and contributes to the work being proposed within IETF to
> take advantage of the knowledge within that group and to align with
> other transport systems, e.g. IP over Cable Data Networks.

DVB also supports the harmonization of such work with ETSI BSM [, and TIA?]
<<comments on the TIA bit please!>>

>
> References
>
> EN 301 192 : Digital Video Broadcasting (DVB);
> DVB specification for data broadcasting
> European Standard (Telecommunications series)
>
> S. Bradner, IETF Working Group Guidelines and Procedures,
> RFC2418 (BCP25 ), September 1998.
>
> Bradner, S., Editor, The Internet Standards Process -- Revision 3,
> RFC 2026 (BCP 9), October 1996.
>
> Hovey, R., and S. Bradner, The Organizations involved in the IETF
> Standards Process, RFC 2028 (BCP 11), October 1996.
>
> << Add more references received via mailing list >>
>

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Dear all,

Actually I watch and usually I read all the emails from this reflector.
Unfortunately I am so busy or often not in the office.
Therefore I am not able to answer immediately. I applogize that I am still so
quite here in this group.

Therefore I would like "take" the buck to put across some thoughts, remarks and
questions according to the
topic of this group.

1. In order to make IP-over-DVB more efficient I still believe that the approach
"MPLS" could work:
     Imagine we transmit each IP connection in a dedicated DVB sub-channel,
given by the PID, we could
     drop the IP headers. We have an unambiguous mappimng between IP and PID.
The PID acts as our
     label. On the receiving side (the engress of our "DVB-MPLS cloud") we
recreate the IP header.
     Think, saves a lot of recources (the complete header).
     Works just in case single IP in a dedicated PID. Often we transmitt many IP
connections in one PID (or all
     in a single PID). Here we could compress headers but not remove. We still
need the IP addresses as
     sub-labels inside PID-channels.

2. In order to have routing function (we are working on our MediaRouter) we need
this mapping between IP
    and PIDs. Problem here, you have to use a free PID and create a new one (if
you insert behind a
    multiplexer). Perhaps it is necessary to read the SI tables to know which
PID is in use and which could be
    use (to modify the tables to signal where is the data stream/IP is not a big
deal).
    When the tables are connected with the routing engine it is guaranteed that
you can change the PID for
    your TV program (new PID) and this is not disturb by the inserted data.
    But: how flexible could be this ? Could you change and use a new PID
on-the-fly ? Does the receiver is
    able to find the new PID to have an uninterrupted data flow ?

3. Next problem: Everything in such a MPEG network is fixed, means the PIDs are
setup permantently.
    And just the system designer knows exactly which bandwidth is used by which
PID for which service.
    How we could define an interface to have access to such a DVB/MPEG network ?
Means: how I can
    allocate a channel, with bandwidth for a limited time period (similar to
Call Setup and Release in telephone
    networks or Resource Reservation Protocols). As far as I know there is no
approach fopr such functions.
    In DAB systems (Digital Sound Broadcasting) we have the STI interface which
support such functions in
    a very flexible way. The service provider can manage his assigned resoruces,
remotely and automated.

4. Question: Should all this work here (a more efficient IP-over-MPEG) consider
to have a mixed TV and data
    system ? Means: We have to share the "wires" with ongoing running TV
programs ? Or is the approach
    to use an entire transport stream just for data (pure data transmission) ?
    Next question: How important is interoperability, with exiting receivers and
decoders and with transport stream
    devices ? Imagine that there is a MPEG-2 infrastructure using MPEG-2 routers
operating on SI tables, PIDs
    etc. Has this still be working ?

5. One remark was to use an ATM-like approach. Why not (know a bit ATM), and I
think the satellite guys are doing
     this already. But MPLS is also based on ATM, therefore again MPLS. Instead
of the ATM header (not so complex
     as IP but still needed to be scanned and parsed) we can use again the PID
as label.
     But an approach like: IP-over-ATM, ATM-over-MPEG is not efficient. ATM does
not support service reliability without
     higher layers (error handling, flow control). The quality of service aspect
(QoS) which we know from ATM comes from
     the very small cells. In MPEG-2 we have larger "cells", the 188 byte
packets. To put ATM on it does not make the
     "cells" smaller.
     To support different service especially CBR (constand bit rate, for
streaming media), VBR (for real-time service)
      and ABR (available bit rate for email, file transfer) is needed. But flow
control for CBR works just with very small cells.
      Problem: how to perform traffic shaping with "MPEG-cells" (the 188 byte
blocks) ? If we add latency and jitter we
      influence dramatically the running TV programs. Works just in a pure data
environment (no PCRs, Program Clock
      References used and needed inside MPEG-2 streams) but not so efficient
like ATM due to the larger units.

6. If we want make IP-via-MPEG more efficient it does not makes sense to drop
just the DSM-CC overhead. We save a
    few bytes but another large wasted bandwidth is within the SI tables. Short
tables are filled with stuffing due to the 188 byte
    borders. Here we could increase the available bandwidth, too. And, the
processing of the complex tables could also
    be canceled.
    Is this the intention ? If yes, what does it mean: IP-over-What ? I belive
just over 188 byte cells (just the sync word 0x47 is
    still used). But than ATM over a coax link is even more efficient and
protocols are existing for the applications and services.

7. Unicast and Multicast:
    Is there a problem: The difference is just the type of IP address and
perhaps some IP header information. The MPEG-2 transport
    stream network itself is not a multicast network, or is it ? Means: is there
an device to duplicate streams in order to send it as
    identical copies to different locations ? If wou want do this you have to
use remultiplexers. But if you bear in mind to design
    your IP-to-PID mapping well, it should work to route transport streams. But
the same problem. Perhaps you have to know
    the PID allocation and useage, the routes in such a MPEG network to decide
in which PID hI have to put my multicast IP in
    order to have many outgoing data connections.

My summary: an exciting and interesting topic but what is the target ? Just to
save a few bytes to increase the bandwidth for
IP ? Not enough. We have to think in services, applications. 100 Kbit/s more
throughput is not a "unique selling proposition"
because with a better service compression (Internet-MPEG-4-movies, MP3 vs. AAC,
HTML text compression) I could have
the same effect. More important, which type of connections or type of traffic
profiles we have to support and how we could manage
this. This seems to me as complex as the ATM challenge was and is (traffic
engineering and management).
I see a lot of opportunities, interesting and challanging items but does this
effort is valuable ? Is a MPEG infrastructure the common
basis of IP networking in future ? I do not think so. IP via MPEG remains the
extension and supplement of digital TV or isn' it ?

Sorry for my brains emission but I have wanted to chip in some ideas and
thoughts. Do not hesitate to reflect to my "none-sense".

Best regards.

Torsten

Torsten Jaekel
Product Marketing Datacasting
Rohde & Schwarz FTK GmbH
Wendenschlossstr. 168, Haus 28
12557 Berlin
Germany
Phone: +49 30 65 89 1 - 103
FAX:     +49 30 65 55 02 21
email: Torsten.Jaekel@FTK.rohde-schwarz.com

PS: Please, I apologize my English mistakes, not my native language and written
quite in hurry.








From majordomo-owner Thu Oct 18 13:41:23 2001
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Date: Thu, 18 Oct 2001 13:41:12 +0100
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Organization: ERG
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The official archive of the ip-dvb is now available via the web at:

http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/archive/

This contains copies of all emails sent via the list and is indexed
by date and thread.

Some people may be surprised to see how short this is. This is because
a high perecentage of the email sent on this topic was sent "off the 
list", and were directed to me personally. I would liek to encourage
more discussion using the ip-dvb list.

Perhaps now is a useful time to review the threads of dicsussion and 
offer comments on some of the issues, or perhaps highlight areas you 
think need further discussion?

best wishes,

Gorry Fairhurst.

From majordomo-owner Fri Oct 19 10:56:39 2001
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I apologize to all on the list - this should have been sent to
all on this list. I noted it missing from the archive and have
includes it here.

This email provides the background to a submission to DVB, 
basically asking for advice, and interest in participation in
a possible future open (ietf) working group...

Martin has agreed to provide the list with feedback on this
discussion item.

Gorry Fairhurst
(admin: ip-dvb@erg.abdn.ac.uk)

----- Forwarded by Martin S Butcher/HNSEU on 09/10/01 16:38 ----- 
   M.Butcher@eu.hns.com 
   Sent by: owner-dvb-tm@list.dvb.org 

   09/10/01 16:18 
   Please respond to M.Butcher 
                                                     
To:        dvb-cm@list.dvb.org, dvb-tm@list.dvb.org 
Subject:        Proposed IETF BoF on IP over DVB - an explaination!

Dear All, 

After some discussions the job of introducing this topic fell on me..
here goes. 


Proposed IETF  BoF on IP over DVB - an explanation! 
------------------------------------------------------   


Background 
------------------ 

With the new direction of DVB 2.0 which has IP as a main element,
certain activities have been started within DVB. Issues with IP have
been raised and many have now
found owner groups. Some issues have not. In some cases expertise on
issues has not been available within the groups within DVB. 

At the last TM meeting a call for remaining technical issues was made
and these are to be debated at the next meeting in November, this
clearly needs to happen and
the following is in no way intended to conflict with this. 

The issue concerning the carriage of IP over DVB have also been raised
in the DVB-BSS group. 

It has been noted that DVB has forged good liaisons with various
external bodies to promote information exchange and the question has
been posed by several DVB
members about liaison with the IETF to ensure that effort is not
duplicated, expertise is available and that good visibility of issues is
achieved. 

One problem with the IETF is that it does not readily support such
liaisons except those formed by the attendees. Thus for any successful
liaison to occur it is important
that DVB members have representation within the IETF and vica versa. 

It came to light in the discussions within the DVB-IPI group that the
PILC (Performance Implications of link Characteristics) group within the
IETF had been studying
transport of IP over links such as MPEG and DVB. Several organisation
who are also DVB members were also active in the IETF and concerned
about the commercial
and technical impliciations of the convergence of DVB/MPEG and IP
networks. Mr Gorry Fairhurst of Aberdeen University (who had presented
work in this group within
the IETF)  undertook to explore how these issues could best be tackled
within both DVB and IETF. 

The question was how to get a group within the IETF that could best
discuss the issues surrounding DVB/MPEG in a similar way to those
tackling ATM, Mobile,
Bluetooth etc. 

How to Create an IETF working group 
------------------------------------------------------- 

The road to creating an IETF group starts with finding a group of people
interested in a topic. 
  
        First one needs to have an issue. 
        This needs to be discussed with an Area Director - e.g. Internet
, Applications, General, Operations, Routing, Security, Sub IP etc. 
        Sufficient interest has to be demonstrated 
        A proposal for a group  at an IETF meeting 
                - This is known as a BoF which stands for 'Birds or a
Feather' ( for those not familiar this is a saying 'Birds of a Feather
Flock Together') 
        The BoF meets - if sufficient people attend the group and a
report is generated the BoF turns into a working group (or else it
dies!). 


Current Status 
--------------------- 

Gorry has a proposal with the relevant Area Director for a BoF to be
held at the next IETF meeting in Salt Lake City (10-14 Dec 2001). He has
created a temporary email
reflector (ip-dvb@erg.abdn.ac.uk) to discuss the formation of this group
and several DVB members have subscribed. 

A decision needs to be taken soon as to:- 

        Is there enough support within DVB for such an activity? 
        Is there any opposition to this activity within DVB? 
        Is the December IETF meeting too soon or should this be
postponed to Minneapolis in March? 

There is no desire to push for an activity that will not have enough
support and therefore not achieve the status of a working group. 

Action Required 
------------------------ 

DVB members interested in this topic and capable of attending the IETF
in either December or March and interested in the proposed BoF should
contact Mr Gorry
Fairhurst gorry@erg.abdn.ac.uk and/or subscribe to the email reflector
ip-dvb@erg.abdn.ac.uk 


Martin Butcher, Technical Manager 
UK Engineering Design Centre 
Hughes Network Systems Europe Ltd. 
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom 
Tel     : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205 
Mobile: +44 7901514110   
Fax    : +44 1908 221127 
Email: M.Butcher@eu.hns.com 


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Hi,

The reaction at the DVB Cm meeting was positive that such liason is 
valuable and should be fostered. I'd expect some more debate from the TM 
but this is not till late November. Noone however has contacted me from 
DVB to say they would attend the meetings, but then I would hope that they 
would react to Gorry or this list. Really I was not expecting other than 
those aleady interested especially from the commercial group but it is 
essential that DVB is kept 'in the loop'.

We have however had a response from Intel representing similar interests 
in ATSC and I will post this on the refector!

                Martin

Martin Butcher, Technical Manager
UK Engineering Design Centre
Hughes Network Systems Europe Ltd.
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom
Tel     : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205  Mobile: 
+44 7901514110 
Fax    : +44 1908 221127
Email: M.Butcher@eu.hns.com


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<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">The reaction at the DVB Cm meeting was positive that such liason is valuable and should be fostered. I'd expect some more debate from the TM but this is not till late November. Noone however has contacted me from DVB to say they would attend the meetings, but then I would hope that they would react to Gorry or this list. Really I was not expecting other than those aleady interested especially from the commercial group but it is essential that DVB is kept 'in the loop'.</font>
<br>
<br><font size=2 face="sans-serif">We have however had a response from Intel representing similar interests in ATSC and I will post this on the refector!</font>
<br>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Martin</font>
<br>
<br><font size=2 face="sans-serif">Martin Butcher, Technical Manager<br>
UK Engineering Design Centre<br>
Hughes Network Systems Europe Ltd.<br>
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom<br>
Tel &nbsp; &nbsp; : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205 &nbsp;Mobile: +44 7901514110 &nbsp;<br>
Fax &nbsp; &nbsp;: +44 1908 221127<br>
Email: M.Butcher@eu.hns.com<br>
</font><CODE><FONT SIZE=3><BR>
<BR>
#**********************************************************************<BR>
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or organisation to whom it is addressed. It may contain<BR>
privileged or confidential information.  If you have received<BR>
this message in error, please notify the originator immediately.<BR>
If you are not the intended recipient, you should not use,<BR>
copy, alter, or disclose the contents of this message.  All<BR>
information or opinions expressed in this message and/or<BR>
any attachments are those of the author and are not<BR>
necessarily those of Hughes Network Systems Limited,<BR>
including its European subsidiaries and affiliates. Hughes<BR>
Network Systems Limited, including its European<BR>
subsidiaries and affiliates accepts no responsibility for loss<BR>
or damage arising from its use, including damage from virus.<BR>
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To: "Crinon, Regis J" <regis.j.crinon@intel.com>
Cc: ip-dvb@erg.abdn.ac.uk
Subject: RE: Proposed IETF BoF on IP over DVB - an explaination!
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Hi,

Would it be possible to see some of the ATSC papers on this subject? It 
would indeed be good to have a single solution. Please join the reflector 
and submit your proposals and we will determine the reaction.

                Martin

Martin Butcher, Technical Manager
UK Engineering Design Centre
Hughes Network Systems Europe Ltd.
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom
Tel     : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205  Mobile: 
+44 7901514110 
Fax    : +44 1908 221127
Email: M.Butcher@eu.hns.com





"Crinon, Regis J" <regis.j.crinon@intel.com>
17/10/01 06:12

 
        To:     "'M.Butcher@eu.hns.com'" <M.Butcher@eu.hns.com>
        cc:     "Crinon, Regis J" <regis.j.crinon@intel.com>
        Subject:        RE: Proposed IETF BoF on IP over DVB - an explaination!



 
    Martin:
                 I read your e-mail with interest. Would it possible 
for  the IETF BoF to widen its focus to IP over ATSC as well ?
The  ATSC T3/S13 Data Broadcast Specialist Group that I 
chair  has just released a specification in which we solved a 
number  of problems related to the mapping of IP networks 
into  an MPEG-2 Transport Stream. We also have defined  
how  SAP/SDP and ATSC PSIP (the counterpart of DVB-SI)
can  coexist and complement each other. Finally we have 
had a  close cooperation with the US cable industry in this 
matter  (DVS 311).  Please let me know. 
 
                 Thank you in advance.
 
                 Regis J. Crinon
                 Intel Corporation 
 
 
============================================
        Regis J.  Crinon, Ph.D.
        Manager, DTV  Standards and Architecture
        Intel  Corporation
         JF3-206
        2111 NE 25th  Avenue
        Hillsboro,  OR 97124 
         USA
        Tel:  503-264-2448
============================================
 
 
 
 
-----Original Message-----
From:  M.Butcher@eu.hns.com [mailto:M.Butcher@eu.hns.com]
Sent: Tuesday,  October 09, 2001 9:19 AM
To: dvb-cm@list.dvb.org;  dvb-tm@list.dvb.org
Subject: Proposed IETF BoF on IP over DVB - an  explaination!


Dear All, 

After some discussions the job of  introducing this topic fell on me.. 
here goes. 


Proposed IETF  BoF on IP over DVB - an  explaination! 
------------------------------------------------------   
------------------------ 

Background 
------------------ 

With the  new direction of DVB 2.0 which has IP as a main element, certain 
activies have  been started within DVB. Issues with IP have been raised 
and many have now  found owner groups. Some issues have not. In some cases 
expertise on issues  has not been available within the groups within DVB. 

At the last TM meeting a call for remaining technical  issues was made and 
these are to be debated at the next meeing in November,  this clearly 
needs to happen and the following is in no way intended to  conflict with 
this. 

The issue  concerning the carriage of IP over DVB have also been raised in 
the DVB-BSS  group. 

It has been noted that DVB  has forged good liasons with various external 
bodies to promote information  exchange and the question has been posed by 
several DVB members about liason  with the IETF to ensure that effort is 
not duplicated, expertise is available  and that good visibility of issues 
is achieved. 

One problem with the IETF is that it does not readily  support such 
liasons except those formed by the attendees. Thus for any  successful 
liason to occur it is important that DVB members have  representation 
within the IETF and vica versa. 

It came to light in the discussions within the DVB-IPI  group that the 
PILC (Performance Implications of link Characteristics) group  within the 
IETF had been studying transport of IP over links such as MPEG and  DVB. 
Several organisation who are also DVB members were also active in the IETF 
and concerned about the commercial and technical impliciations of the 
convergence of DVB/MPEG and IP networks. Mr Gorry Fairhurst of Aberdeen 
University (who had presented work in this group within the IETF) 
 undertook to explore how these issues could best be tackled within both 
DVB and IETF. 

The question was how  to get a group within the IETF that could best 
discuss the issues surrounding  DVB/MPEG in a similar way to those 
tackling ATM, Mobile, Bluetooth etc. 

How to Create an IETF working  group 
------------------------------------------------------- 

The road to creating an IETF group starts  with finding a group of people 
interested in a topic. 
  
         First one needs to have an issue. 
        This needs to be discussed  with an Area Director - e.g. Internet 
, Applications, General, Operations,  Routing, Security, Sub IP etc. 
         Sufficient interest has to be demonstrated 
        A proposal  for a group  at an IETF meeting 
                - This is known  as a BoF which stands for 'Birds or a 
Feather' ( for those not familiar this  is a saying 'Birds of a Feather 
Flock Together') 
        The BoF meets - if  sufficient people attend the group and a 
report is generated the BoF turns  into a working group (or else it 
dies!). 


Current Status 
--------------------- 

Gorry  has a proposal with the relevant Area Director for a BoF to be held 
at the  next IETF meeting in Salt Lake City (10-14 Dec 2001). He has 
created a  temporary email reflector (ip-dvb@erg.abdn.ac.uk) to discuss 
the formation of  this group and several DVB members have subscribed. 

A decision needs to be taken soon as to:- 

        Is there  enough support within DVB for such an activity? 
        Is there any opposition to  this activity within DVB? 
         Is the December IETF meeting too soon or should this be postponed 
to Minneapolis in March? 

There is no desire to push for an activity that will not have enough 
support and therefore not achieve the status of a working group. 

Action Required 
------------------------ 

DVB members interested in this topic and capable of  attending the IETF in 
either December or March and interested in the proposed  BoF should 
contact Mr Gorry Fairhurst gorry@erg.abdn.ac.uk and/or  subscribe to the email reflector ip-dvb@erg.abdn.ac.uk 



         







  

Martin Butcher,  Technical Manager
UK Engineering Design Centre
Hughes Network Systems  Europe Ltd.
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United  Kingdom
Tel     : Direct +44 1908 326 205 Tel Main +44 1908  221122 x 205  Mobile: 
+44 7901514110  
Fax    : +44  1908 221127
Email: M.Butcher@eu.hns.com


#**********************************************************************
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If you are not the intended recipient, you should  not use,
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this message in error, please notify the originator immediately.
If you are not the intended recipient, you should not use,
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Network Systems Limited, including its European
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<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">Would it be possible to see some of the ATSC papers on this subject? It would indeed be good to have a single solution. Please join the reflector and submit your proposals and we will determine the reaction.</font>
<br>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Martin</font>
<br>
<br><font size=2 face="sans-serif">Martin Butcher, Technical Manager<br>
UK Engineering Design Centre<br>
Hughes Network Systems Europe Ltd.<br>
Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom<br>
Tel &nbsp; &nbsp; : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205 &nbsp;Mobile: +44 7901514110 &nbsp;<br>
Fax &nbsp; &nbsp;: +44 1908 221127<br>
Email: M.Butcher@eu.hns.com<br>
</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>&quot;Crinon, Regis J&quot; &lt;regis.j.crinon@intel.com&gt;</b></font>
<p><font size=1 face="sans-serif">17/10/01 06:12</font>
<br>
<td><font size=1 face="Arial">&nbsp; &nbsp; &nbsp; &nbsp; </font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; To: &nbsp; &nbsp; &nbsp; &nbsp;&quot;'M.Butcher@eu.hns.com'&quot; &lt;M.Butcher@eu.hns.com&gt;</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; cc: &nbsp; &nbsp; &nbsp; &nbsp;&quot;Crinon, Regis J&quot; &lt;regis.j.crinon@intel.com&gt;</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Subject: &nbsp; &nbsp; &nbsp; &nbsp;RE: Proposed IETF BoF on IP over DVB - an explaination!</font></table>
<br>
<br>
<br>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp; Martin:</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;I read your e-mail with interest. Would it possible </font>
<br><font size=2 face="sans-serif">for &nbsp;the IETF BoF to widen its focus to IP over ATSC as well ?</font>
<br><font size=2 face="sans-serif">The &nbsp;ATSC T3/S13 Data Broadcast Specialist Group that I </font>
<br><font size=2 face="sans-serif">chair &nbsp;has just released a specification in which we solved a </font>
<br><font size=2 face="sans-serif">number &nbsp;of problems related to the mapping of IP networks </font>
<br><font size=2 face="sans-serif">into &nbsp;an MPEG-2 Transport Stream. We also have defined&nbsp; </font>
<br><font size=2 face="sans-serif">how &nbsp;SAP/SDP and ATSC PSIP (the counterpart of DVB-SI)</font>
<br><font size=2 face="sans-serif">can &nbsp;coexist and complement each other. Finally we have </font>
<br><font size=2 face="sans-serif">had a &nbsp;close cooperation with the US cable industry in this </font>
<br><font size=2 face="sans-serif">matter &nbsp;(DVS 311).&nbsp;&nbsp;Please let me know. </font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;Thank you in advance.</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;Regis J. Crinon</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;Intel Corporation </font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=2 face="sans-serif">============================================</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regis J. &nbsp;Crinon, Ph.D.</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Manager, DTV &nbsp;Standards and Architecture</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Intel &nbsp;Corporation</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;JF3-206</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2111 NE 25th &nbsp;Avenue</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Hillsboro, &nbsp;OR 97124 </font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;USA</font>
<br><font size=2 face="sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Tel: &nbsp;503-264-2448</font>
<br><font size=2 face="sans-serif">============================================</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=3 face="sans-serif">&nbsp;</font>
<br><font size=2 face="sans-serif">-----Original Message-----</font>
<br><font size=2 face="sans-serif"><b>From:</b> &nbsp;M.Butcher@eu.hns.com [mailto:M.Butcher@eu.hns.com]</font>
<br><font size=2 face="sans-serif"><b>Sent:</b> Tuesday, &nbsp;October 09, 2001 9:19 AM</font>
<br><font size=2 face="sans-serif"><b>To:</b> dvb-cm@list.dvb.org; &nbsp;dvb-tm@list.dvb.org</font>
<br><font size=2 face="sans-serif"><b>Subject:</b> Proposed IETF BoF on IP over DVB - an &nbsp;explaination!</font>
<br>
<br>
<br><font size=2 face="sans-serif">Dear All,</font><font size=3 face="sans-serif"> &nbsp;</font>
<br>
<br><font size=2 face="sans-serif">After some discussions the job of &nbsp;introducing this topic fell on me.. here goes.</font><font size=3 face="sans-serif"> </font>
<br>
<br>
<br><font size=2 face="sans-serif">Proposed IETF &nbsp;BoF on IP over DVB - an &nbsp;explaination!</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">------------------------------------------------------ &nbsp; &nbsp;------------------------</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">Background</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">------------------</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">With the &nbsp;new direction of DVB 2.0 which has IP as a main element, certain activies have &nbsp;been started within DVB. Issues with IP have been raised and many have now &nbsp;found owner groups. Some issues have not. In some cases expertise on issues &nbsp;has not been available within the groups within DVB. </font>
<br>
<br><font size=2 face="sans-serif">At the last TM meeting a call for remaining technical &nbsp;issues was made and these are to be debated at the next meeing in November, &nbsp;this clearly needs to happen and the following is in no way intended to &nbsp;conflict with this.</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">The issue &nbsp;concerning the carriage of IP over DVB have also been raised in the DVB-BSS &nbsp;group.</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">It has been noted that DVB &nbsp;has forged good liasons with various external bodies to promote information &nbsp;exchange and the question has been posed by several DVB members about liason &nbsp;with the IETF to ensure that effort is not duplicated, expertise is available &nbsp;and that good visibility of issues is achieved. </font>
<br>
<br><font size=2 face="sans-serif">One problem with the IETF is that it does not readily &nbsp;support such liasons except those formed by the attendees. Thus for any &nbsp;successful liason to occur it is important that DVB members have &nbsp;representation within the IETF and vica versa.</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">It came to light in the discussions within the DVB-IPI &nbsp;group that the PILC (Performance Implications of link Characteristics) group &nbsp;within the IETF had been studying transport of IP over links such as MPEG and &nbsp;DVB. Several organisation who are also DVB members were also active in the &nbsp;IETF and concerned about the commercial and technical impliciations of the &nbsp;convergence of DVB/MPEG and IP networks. Mr Gorry Fairhurst of Aberdeen &nbsp;University (who had presented work in this group within the IETF) &nbsp;&nbsp;undertook to explore how these issues could best be tackled within both &nbsp;DVB and IETF.</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">The question was how &nbsp;to get a group within the IETF that could best discuss the issues surrounding &nbsp;DVB/MPEG in a similar way to those tackling ATM, Mobile, Bluetooth etc. &nbsp;</font>
<br>
<br><font size=2 face="sans-serif">How to Create an IETF working &nbsp;group</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">-------------------------------------------------------</font><font size=3 face="sans-serif"> &nbsp;</font>
<br>
<br><font size=2 face="sans-serif">The road to creating an IETF group starts &nbsp;with finding a group of people interested in a topic.</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp;</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; First one needs to have an issue.</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; This needs to be discussed &nbsp;with an Area Director - e.g. Internet , Applications, General, Operations, &nbsp;Routing, Security, Sub IP etc.</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; Sufficient interest has to be demonstrated &nbsp;</font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; A proposal &nbsp;for a group &nbsp;at an IETF meeting </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; - This is known &nbsp;as a BoF which stands for 'Birds or a Feather' ( for those not familiar this &nbsp;is a saying 'Birds of a Feather Flock Together')</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; The BoF meets - if &nbsp;sufficient people attend the group and a report is generated the BoF turns &nbsp;into a working group (or else it dies!).</font><font size=3 face="sans-serif"> </font>
<br>
<br>
<br><font size=2 face="sans-serif">Current Status</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">---------------------</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">Gorry &nbsp;has a proposal with the relevant Area Director for a BoF to be held at the &nbsp;next IETF meeting in Salt Lake City (10-14 Dec 2001). He has created a &nbsp;temporary email reflector (ip-dvb@erg.abdn.ac.uk) to discuss the formation of &nbsp;this group and several DVB members have subscribed. </font>
<br>
<br><font size=2 face="sans-serif">A decision needs to be taken soon as to:-</font><font size=3 face="sans-serif"> &nbsp;</font>
<br>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Is there &nbsp;enough support within DVB for such an activity?</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Is there any opposition to &nbsp;this activity within DVB?</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; Is the December IETF meeting too soon or should this be &nbsp;postponed to Minneapolis in March? </font>
<br>
<br><font size=2 face="sans-serif">There is no desire to push for an activity that will not have enough &nbsp;support and therefore not achieve the status of a working group. &nbsp;</font>
<br>
<br><font size=2 face="sans-serif">Action Required</font><font size=3 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">------------------------</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">DVB members interested in this topic and capable of &nbsp;attending the IETF in either December or March and interested in the proposed &nbsp;BoF should contact Mr Gorry Fairhurst </font><font size=1 face="sans-serif"><b>gorry@erg.abdn.ac.uk </b></font><font size=2 face="sans-serif">and/or &nbsp;subscribe to the email reflector <b>ip-dvb@erg.abdn.ac.uk &nbsp;</b></font>
<br>
<br>
<br>
<br><font size=2 face="sans-serif"><b>&nbsp; &nbsp; &nbsp;&nbsp; &nbsp; </b></font>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br><font size=2 face="sans-serif">&nbsp;</font><font size=3 face="sans-serif"> </font>
<br>
<br><font size=2 face="sans-serif">Martin Butcher, &nbsp;Technical Manager</font>
<br><font size=2 face="sans-serif">UK Engineering Design Centre</font>
<br><font size=2 face="sans-serif">Hughes Network Systems &nbsp;Europe Ltd.</font>
<br><font size=2 face="sans-serif">Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United &nbsp;Kingdom</font>
<br><font size=2 face="sans-serif">Tel &nbsp; &nbsp; : Direct +44 1908 326 205 Tel Main +44 1908 &nbsp;221122 x 205 &nbsp;Mobile: +44 7901514110 &nbsp;</font>
<br><font size=2 face="sans-serif">Fax &nbsp; &nbsp;: +44 &nbsp;1908 221127</font>
<br><font size=2 face="sans-serif">Email: M.Butcher@eu.hns.com</font>
<br>
<br>
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This message is intended solely for the use of the individual<BR>
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including its European subsidiaries and affiliates. Hughes<BR>
Network Systems Limited, including its European<BR>
subsidiaries and affiliates accepts no responsibility for loss<BR>
or damage arising from its use, including damage from virus.<BR>
#**********************************************************************<BR>
</FONT></CODE>
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From majordomo-owner Fri Oct 19 14:51:24 2001
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Martin,

    I think the transition from BoF to Working Group requires more work than
you state here.  But, that is no reason to scare anyone off, hence my private
responses...


John


M.Butcher@hns.com wrote:
> 
> Hi,
> 
> Would it be possible to see some of the ATSC papers on this subject? It
> would indeed be good to have a single solution. Please join the reflector
> and submit your proposals and we will determine the reaction.
> 
>                 Martin
> 
> Martin Butcher, Technical Manager
> UK Engineering Design Centre
> Hughes Network Systems Europe Ltd.
> Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom
> Tel     : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205  Mobile:
> +44 7901514110
> Fax    : +44 1908 221127
> Email: M.Butcher@eu.hns.com
> 
>  "Crinon, Regis J"
>  <regis.j.crinon@intel.com>                  To:
>                                       "'M.Butcher@eu.hns.com'"
>  17/10/01 06:12                      <M.Butcher@eu.hns.com>
>                                              cc:        "Crinon, Regis J"
>                                      <regis.j.crinon@intel.com>
>                                              Subject:        RE: Proposed
>                                      IETF BoF on IP over DVB - an
>                                      explaination!
> 
> 
>     Martin:
>                  I read your e-mail with interest. Would it possible
> for  the IETF BoF to widen its focus to IP over ATSC as well ?
> The  ATSC T3/S13 Data Broadcast Specialist Group that I
> chair  has just released a specification in which we solved a
> number  of problems related to the mapping of IP networks
> into  an MPEG-2 Transport Stream. We also have defined
> how  SAP/SDP and ATSC PSIP (the counterpart of DVB-SI)
> can  coexist and complement each other. Finally we have
> had a  close cooperation with the US cable industry in this
> matter  (DVS 311).  Please let me know.
> 
>                  Thank you in advance.
> 
>                  Regis J. Crinon
>                  Intel Corporation
> 
> 
> ============================================
>         Regis J.  Crinon, Ph.D.
>         Manager, DTV  Standards and Architecture
>         Intel  Corporation
>          JF3-206
>         2111 NE 25th  Avenue
>         Hillsboro,  OR 97124
>          USA
>         Tel:  503-264-2448
> ============================================
> 
> 
> 
> 
> -----Original Message-----
> From:  M.Butcher@eu.hns.com [mailto:M.Butcher@eu.hns.com]
> Sent: Tuesday,  October 09, 2001 9:19 AM
> To: dvb-cm@list.dvb.org;  dvb-tm@list.dvb.org
> Subject: Proposed IETF BoF on IP over DVB - an  explaination!
> 
> Dear All,
> 
> After some discussions the job of  introducing this topic fell on me.. here
> goes.
> 
> Proposed IETF  BoF on IP over DVB - an  explaination!
> ------------------------------------------------------
>  ------------------------
> 
> Background
> ------------------
> 
> With the  new direction of DVB 2.0 which has IP as a main element, certain
> activies have  been started within DVB. Issues with IP have been raised and
> many have now  found owner groups. Some issues have not. In some cases
> expertise on issues  has not been available within the groups within DVB.
> 
> At the last TM meeting a call for remaining technical  issues was made and
> these are to be debated at the next meeing in November,  this clearly needs
> to happen and the following is in no way intended to  conflict with this.
> 
> The issue  concerning the carriage of IP over DVB have also been raised in
> the DVB-BSS  group.
> 
> It has been noted that DVB  has forged good liasons with various external
> bodies to promote information  exchange and the question has been posed by
> several DVB members about liason  with the IETF to ensure that effort is not
> duplicated, expertise is available  and that good visibility of issues is
> achieved.
> 
> One problem with the IETF is that it does not readily  support such liasons
> except those formed by the attendees. Thus for any  successful liason to
> occur it is important that DVB members have  representation within the IETF
> and vica versa.
> 
> It came to light in the discussions within the DVB-IPI  group that the PILC
> (Performance Implications of link Characteristics) group  within the IETF
> had been studying transport of IP over links such as MPEG and  DVB. Several
> organisation who are also DVB members were also active in the  IETF and
> concerned about the commercial and technical impliciations of the
>  convergence of DVB/MPEG and IP networks. Mr Gorry Fairhurst of Aberdeen
>  University (who had presented work in this group within the IETF)
>   undertook to explore how these issues could best be tackled within both
>  DVB and IETF.
> 
> The question was how  to get a group within the IETF that could best discuss
> the issues surrounding  DVB/MPEG in a similar way to those tackling ATM,
> Mobile, Bluetooth etc.
> 
> How to Create an IETF working  group
> -------------------------------------------------------
> 
> The road to creating an IETF group starts  with finding a group of people
> interested in a topic.
> 
>          First one needs to have an issue.
>         This needs to be discussed  with an Area Director - e.g. Internet ,
> Applications, General, Operations,  Routing, Security, Sub IP etc.
>          Sufficient interest has to be demonstrated
>         A proposal  for a group  at an IETF meeting
>                 - This is known  as a BoF which stands for 'Birds or a
> Feather' ( for those not familiar this  is a saying 'Birds of a Feather
> Flock Together')
>         The BoF meets - if  sufficient people attend the group and a report
> is generated the BoF turns  into a working group (or else it dies!).
> 
> Current Status
> ---------------------
> 
> Gorry  has a proposal with the relevant Area Director for a BoF to be held
> at the  next IETF meeting in Salt Lake City (10-14 Dec 2001). He has created
> a  temporary email reflector (ip-dvb@erg.abdn.ac.uk) to discuss the
> formation of  this group and several DVB members have subscribed.
> 
> A decision needs to be taken soon as to:-
> 
>         Is there  enough support within DVB for such an activity?
>         Is there any opposition to  this activity within DVB?
>          Is the December IETF meeting too soon or should this be  postponed
> to Minneapolis in March?
> 
> There is no desire to push for an activity that will not have enough
>  support and therefore not achieve the status of a working group.
> 
> Action Required
> ------------------------
> 
> DVB members interested in this topic and capable of  attending the IETF in
> either December or March and interested in the proposed  BoF should contact
> Mr Gorry Fairhurst gorry@erg.abdn.ac.uk and/or  subscribe to the email
> reflector ip-dvb@erg.abdn.ac.uk
> 
> 
> 
> 
> 
> Martin Butcher,  Technical Manager
> UK Engineering Design Centre
> Hughes Network Systems  Europe Ltd.
> Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United  Kingdom
> Tel     : Direct +44 1908 326 205 Tel Main +44 1908  221122 x 205  Mobile:
> +44 7901514110
> Fax    : +44  1908 221127
> Email: M.Butcher@eu.hns.com
> 
> #**********************************************************************
> This  message is intended solely for the use of the individual
> or organisation to  whom it is addressed. It may contain
> privileged or confidential  information. If you have received
> this message in error, please notify the  originator immediately.
> If you are not the intended recipient, you should  not use,
> copy, alter, or disclose the contents of this message.  All
> information or opinions expressed in this message and/or
> any  attachments are those of the author and are not
> necessarily those of Hughes  Network Systems Limited,
> including its European subsidiaries and  affiliates. Hughes
> Network Systems Limited, including its  European
> subsidiaries and affiliates accepts no responsibility for  loss
> or damage arising from its use, including damage from  virus.
> #**********************************************************************
> 
> #**********************************************************************
> This message is intended solely for the use of the individual
> or organisation to whom it is addressed. It may contain
> privileged or confidential information. If you have received
> this message in error, please notify the originator immediately.
> If you are not the intended recipient, you should not use,
> copy, alter, or disclose the contents of this message. All
> information or opinions expressed in this message and/or
> any attachments are those of the author and are not
> necessarily those of Hughes Network Systems Limited,
> including its European subsidiaries and affiliates. Hughes
> Network Systems Limited, including its European
> subsidiaries and affiliates accepts no responsibility for loss
> or damage arising from its use, including damage from virus.
> #**********************************************************************

From majordomo-owner Fri Oct 19 15:17:20 2001
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Martin,

    Got interrupted there and sent that prematurely.  (I also noticed that the
message was already limited to the "IETF" DVB list.  I thought you had copied
that message to other lists.)

    Anyway, to finish my previous thought...  To get from BoF to Working
Group, in addition to showing that there are people willing to work on the
problem, you have to convince the IESG that the particular problem which you
define should be worked on within the IETF.  That shouldn't be too hard
though, given all of the other IP over FOO work being done.  

    One of the most important things that needs to happen to get from BoF to
WG is to produce a WG charter.  I think it will be premature to work on a
charter in Salt Lake City. So, I would suggest we try for a BoF just to talk
about this issues at Salt Lake City.  And, then use another BoF in Minneapolis
to finalize a charter (assuming the BoF in Salt Lake City determines that it
is useful to do so).  


John

John Border wrote:
> 
> Martin,
> 
>     I think the transition from BoF to Working Group requires more work than
> you state here.  But, that is no reason to scare anyone off, hence my private
> responses...
> 
> John
> 
> M.Butcher@hns.com wrote:
> >
> > Hi,
> >
> > Would it be possible to see some of the ATSC papers on this subject? It
> > would indeed be good to have a single solution. Please join the reflector
> > and submit your proposals and we will determine the reaction.
> >
> >                 Martin
> >
> > Martin Butcher, Technical Manager
> > UK Engineering Design Centre
> > Hughes Network Systems Europe Ltd.
> > Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United Kingdom
> > Tel     : Direct +44 1908 326 205 Tel Main +44 1908 221122 x 205  Mobile:
> > +44 7901514110
> > Fax    : +44 1908 221127
> > Email: M.Butcher@eu.hns.com
> >
> >  "Crinon, Regis J"
> >  <regis.j.crinon@intel.com>                  To:
> >                                       "'M.Butcher@eu.hns.com'"
> >  17/10/01 06:12                      <M.Butcher@eu.hns.com>
> >                                              cc:        "Crinon, Regis J"
> >                                      <regis.j.crinon@intel.com>
> >                                              Subject:        RE: Proposed
> >                                      IETF BoF on IP over DVB - an
> >                                      explaination!
> >
> >
> >     Martin:
> >                  I read your e-mail with interest. Would it possible
> > for  the IETF BoF to widen its focus to IP over ATSC as well ?
> > The  ATSC T3/S13 Data Broadcast Specialist Group that I
> > chair  has just released a specification in which we solved a
> > number  of problems related to the mapping of IP networks
> > into  an MPEG-2 Transport Stream. We also have defined
> > how  SAP/SDP and ATSC PSIP (the counterpart of DVB-SI)
> > can  coexist and complement each other. Finally we have
> > had a  close cooperation with the US cable industry in this
> > matter  (DVS 311).  Please let me know.
> >
> >                  Thank you in advance.
> >
> >                  Regis J. Crinon
> >                  Intel Corporation
> >
> >
> > ============================================
> >         Regis J.  Crinon, Ph.D.
> >         Manager, DTV  Standards and Architecture
> >         Intel  Corporation
> >          JF3-206
> >         2111 NE 25th  Avenue
> >         Hillsboro,  OR 97124
> >          USA
> >         Tel:  503-264-2448
> > ============================================
> >
> >
> >
> >
> > -----Original Message-----
> > From:  M.Butcher@eu.hns.com [mailto:M.Butcher@eu.hns.com]
> > Sent: Tuesday,  October 09, 2001 9:19 AM
> > To: dvb-cm@list.dvb.org;  dvb-tm@list.dvb.org
> > Subject: Proposed IETF BoF on IP over DVB - an  explaination!
> >
> > Dear All,
> >
> > After some discussions the job of  introducing this topic fell on me.. here
> > goes.
> >
> > Proposed IETF  BoF on IP over DVB - an  explaination!
> > ------------------------------------------------------
> >  ------------------------
> >
> > Background
> > ------------------
> >
> > With the  new direction of DVB 2.0 which has IP as a main element, certain
> > activies have  been started within DVB. Issues with IP have been raised and
> > many have now  found owner groups. Some issues have not. In some cases
> > expertise on issues  has not been available within the groups within DVB.
> >
> > At the last TM meeting a call for remaining technical  issues was made and
> > these are to be debated at the next meeing in November,  this clearly needs
> > to happen and the following is in no way intended to  conflict with this.
> >
> > The issue  concerning the carriage of IP over DVB have also been raised in
> > the DVB-BSS  group.
> >
> > It has been noted that DVB  has forged good liasons with various external
> > bodies to promote information  exchange and the question has been posed by
> > several DVB members about liason  with the IETF to ensure that effort is not
> > duplicated, expertise is available  and that good visibility of issues is
> > achieved.
> >
> > One problem with the IETF is that it does not readily  support such liasons
> > except those formed by the attendees. Thus for any  successful liason to
> > occur it is important that DVB members have  representation within the IETF
> > and vica versa.
> >
> > It came to light in the discussions within the DVB-IPI  group that the PILC
> > (Performance Implications of link Characteristics) group  within the IETF
> > had been studying transport of IP over links such as MPEG and  DVB. Several
> > organisation who are also DVB members were also active in the  IETF and
> > concerned about the commercial and technical impliciations of the
> >  convergence of DVB/MPEG and IP networks. Mr Gorry Fairhurst of Aberdeen
> >  University (who had presented work in this group within the IETF)
> >   undertook to explore how these issues could best be tackled within both
> >  DVB and IETF.
> >
> > The question was how  to get a group within the IETF that could best discuss
> > the issues surrounding  DVB/MPEG in a similar way to those tackling ATM,
> > Mobile, Bluetooth etc.
> >
> > How to Create an IETF working  group
> > -------------------------------------------------------
> >
> > The road to creating an IETF group starts  with finding a group of people
> > interested in a topic.
> >
> >          First one needs to have an issue.
> >         This needs to be discussed  with an Area Director - e.g. Internet ,
> > Applications, General, Operations,  Routing, Security, Sub IP etc.
> >          Sufficient interest has to be demonstrated
> >         A proposal  for a group  at an IETF meeting
> >                 - This is known  as a BoF which stands for 'Birds or a
> > Feather' ( for those not familiar this  is a saying 'Birds of a Feather
> > Flock Together')
> >         The BoF meets - if  sufficient people attend the group and a report
> > is generated the BoF turns  into a working group (or else it dies!).
> >
> > Current Status
> > ---------------------
> >
> > Gorry  has a proposal with the relevant Area Director for a BoF to be held
> > at the  next IETF meeting in Salt Lake City (10-14 Dec 2001). He has created
> > a  temporary email reflector (ip-dvb@erg.abdn.ac.uk) to discuss the
> > formation of  this group and several DVB members have subscribed.
> >
> > A decision needs to be taken soon as to:-
> >
> >         Is there  enough support within DVB for such an activity?
> >         Is there any opposition to  this activity within DVB?
> >          Is the December IETF meeting too soon or should this be  postponed
> > to Minneapolis in March?
> >
> > There is no desire to push for an activity that will not have enough
> >  support and therefore not achieve the status of a working group.
> >
> > Action Required
> > ------------------------
> >
> > DVB members interested in this topic and capable of  attending the IETF in
> > either December or March and interested in the proposed  BoF should contact
> > Mr Gorry Fairhurst gorry@erg.abdn.ac.uk and/or  subscribe to the email
> > reflector ip-dvb@erg.abdn.ac.uk
> >
> >
> >
> >
> >
> > Martin Butcher,  Technical Manager
> > UK Engineering Design Centre
> > Hughes Network Systems  Europe Ltd.
> > Saxon Street, Linford Wood , Milton Keynes MK14 6LD, United  Kingdom
> > Tel     : Direct +44 1908 326 205 Tel Main +44 1908  221122 x 205  Mobile:
> > +44 7901514110
> > Fax    : +44  1908 221127
> > Email: M.Butcher@eu.hns.com
> >
> > #**********************************************************************
> > This  message is intended solely for the use of the individual
> > or organisation to  whom it is addressed. It may contain
> > privileged or confidential  information. If you have received
> > this message in error, please notify the  originator immediately.
> > If you are not the intended recipient, you should  not use,
> > copy, alter, or disclose the contents of this message.  All
> > information or opinions expressed in this message and/or
> > any  attachments are those of the author and are not
> > necessarily those of Hughes  Network Systems Limited,
> > including its European subsidiaries and  affiliates. Hughes
> > Network Systems Limited, including its  European
> > subsidiaries and affiliates accepts no responsibility for  loss
> > or damage arising from its use, including damage from  virus.
> > #**********************************************************************
> >
> > #**********************************************************************
> > This message is intended solely for the use of the individual
> > or organisation to whom it is addressed. It may contain
> > privileged or confidential information. If you have received
> > this message in error, please notify the originator immediately.
> > If you are not the intended recipient, you should not use,
> > copy, alter, or disclose the contents of this message. All
> > information or opinions expressed in this message and/or
> > any attachments are those of the author and are not
> > necessarily those of Hughes Network Systems Limited,
> > including its European subsidiaries and affiliates. Hughes
> > Network Systems Limited, including its European
> > subsidiaries and affiliates accepts no responsibility for loss
> > or damage arising from its use, including damage from virus.
> > #**********************************************************************

From majordomo-owner Fri Oct 19 16:27:27 2001
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Date: Fri, 19 Oct 2001 16:23:07 +0100 (BST)
From: Lloyd Wood <l.wood@eim.surrey.ac.uk>
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a brief comment:

On Fri, 19 Oct 2001, Gorry Fairhurst forwarded Martin Butcher saying:

> It has been noted that DVB has forged good liaisons with various
> external bodies to promote information exchange and the question
> has been posed by several DVB members about liaison with the IETF
> to ensure that effort is not duplicated, expertise is available
> and that good visibility of issues is achieved.
> 
> One problem with the IETF is that it does not readily support such
> liaisons except those formed by the attendees.

Well, there are official memoranda of understandings these
days; thinking of e.g.

RFC3113/3131 3GPP(2)-IETF standardization collaboration

in particular (the 'non-protocol document' bit is always amusing;
these seem intended to keep the non-IETF group happy). The main reason
imo that the IETF doesn't form liasons is that since the
decision-making and document drafting process is more open (to those 
who don't mind wading through email vs attending meetings, anyway) it
thinks it has far less need to...

not sure such a collaboration doc is a worthwhile goal.

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>





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Torsten, you raise some interesting issues, here are my comments!

Are there other viewpoints on where we should be going?

Gorry

Torsten.Jaekel@FTK.rohde-schwarz.com wrote:
> 
> Dear all,
> 
> Actually I watch and usually I read all the emails from this reflector.
> Unfortunately I am so busy or often not in the office.
> Therefore I am not able to answer immediately. I applogize that I am still so
> quite here in this group.
> 
> Therefore I would like "take" the buck to put across some thoughts, remarks and
> questions according to the
> topic of this group.
> 
> 1. In order to make IP-over-DVB more efficient I still believe that the approach
> "MPLS" could work:
>      Imagine we transmit each IP connection in a dedicated DVB sub-channel,
> given by the PID, we could
>      drop the IP headers. We have an unambiguous mappimng between IP and PID.
> The PID acts as our
>      label. On the receiving side (the engress of our "DVB-MPLS cloud") we
> recreate the IP header.
>      Think, saves a lot of recources (the complete header).
>      Works just in case single IP in a dedicated PID. Often we transmitt many IP
> connections in one PID (or all
>      in a single PID). Here we could compress headers but not remove. We still
> need the IP addresses as
>      sub-labels inside PID-channels.

This seems to be relevant, it talks of a way to improve bandwidth
efficiency, however
I'd probably say this was "compression".  MPLS adds extra tags to
simplify routing,
whereas the proposed work in the IETF ROHC WG replaces the IP (and
sometimes other 
headers UDP, RTP,  TCP?) with small header and a context id.

> 
> 2. In order to have routing function (we are working on our MediaRouter) we need
> this mapping between IP
>     and PIDs. Problem here, you have to use a free PID and create a new one (if
> you insert behind a
>     multiplexer). Perhaps it is necessary to read the SI tables to know which
> PID is in use and which could be
>     use (to modify the tables to signal where is the data stream/IP is not a big
> deal).
>     When the tables are connected with the routing engine it is guaranteed that
> you can change the PID for
>     your TV program (new PID) and this is not disturb by the inserted data.
>     But: how flexible could be this ? Could you change and use a new PID
> on-the-fly ? Does the receiver is
>     able to find the new PID to have an uninterrupted data flow ?
> 

OK, so this also relates to the discussion on "arp" type mechanisms

> 3. Next problem: Everything in such a MPEG network is fixed, means the PIDs are
> setup permantently.
>     And just the system designer knows exactly which bandwidth is used by which
> PID for which service.
>     How we could define an interface to have access to such a DVB/MPEG network ?
> Means: how I can
>     allocate a channel, with bandwidth for a limited time period (similar to
> Call Setup and Release in telephone
>     networks or Resource Reservation Protocols). As far as I know there is no
> approach fopr such functions.
>     In DAB systems (Digital Sound Broadcasting) we have the STI interface which
> support such functions in
>     a very flexible way. The service provider can manage his assigned resoruces,
> remotely and automated..
> 
> 4. Question: Should all this work here (a more efficient IP-over-MPEG) consider
> to have a mixed TV and data
>     system ? Means: We have to share the "wires" with ongoing running TV
> programs ? Or is the approach
>     to use an entire transport stream just for data (pure data transmission) ?
>     Next question: How important is interoperability, with exiting receivers and
> decoders and with transport stream
>     devices ? Imagine that there is a MPEG-2 infrastructure using MPEG-2 routers
> operating on SI tables, PIDs
>     etc. Has this still be working ?
> 
> 5. One remark was to use an ATM-like approach. Why not (know a bit ATM), and I
> think the satellite guys are doing
>      this already. But MPLS is also based on ATM, therefore again MPLS. Instead
> of the ATM header (not so complex
>      as IP but still needed to be scanned and parsed) we can use again the PID
> as label.
>      But an approach like: IP-over-ATM, ATM-over-MPEG is not efficient. ATM does
> not support service reliability without
>      higher layers (error handling, flow control). The quality of service aspect
> (QoS) which we know from ATM comes from
>      the very small cells. In MPEG-2 we have larger "cells", the 188 byte
> packets. To put ATM on it does not make the
>      "cells" smaller.
>      To support different service especially CBR (constand bit rate, for
> streaming media), VBR (for real-time service)
>       and ABR (available bit rate for email, file transfer) is needed. But flow
> control for CBR works just with very small cells.
>       Problem: how to perform traffic shaping with "MPEG-cells" (the 188 byte
> blocks) ? If we add latency and jitter we
>       influence dramatically the running TV programs. Works just in a pure data
> environment (no PCRs, Program Clock
>       References used and needed inside MPEG-2 streams) but not so efficient
> like ATM due to the larger units.
> 
> 6. If we want make IP-via-MPEG more efficient it does not makes sense to drop
> just the DSM-CC overhead. We save a
>     few bytes but another large wasted bandwidth is within the SI tables. Short
> tables are filled with stuffing due to the 188 byte
>     borders. Here we could increase the available bandwidth, too. And, the
> processing of the complex tables could also
>     be canceled.
>     Is this the intention ? If yes, what does it mean: IP-over-What ? I belive
> just over 188 byte cells (just the sync word 0x47 is
>     still used). But than ATM over a coax link is even more efficient and
> protocols are existing for the applications and services.
> 

Interesting - should we do away with SI tables reflecting IP content?
Or is the Si to valuable for compatibility reasons?
Is there some compromise - IP signalling with SI to identify PIDs to
other equipment?

> 7. Unicast and Multicast:
>     Is there a problem: The difference is just the type of IP address and
> perhaps some IP header information. The MPEG-2 transport
>     stream network itself is not a multicast network, or is it ? Means: is there
> an device to duplicate streams in order to send it as
>     identical copies to different locations ? If wou want do this you have to
> use remultiplexers. But if you bear in mind to design
>     your IP-to-PID mapping well, it should work to route transport streams. But
> the same problem. Perhaps you have to know
>     the PID allocation and useage, the routes in such a MPEG network to decide
> in which PID hI have to put my multicast IP in
>     order to have many outgoing data connections.
> 

Yes, but the multicast service in IP needs receivers to have the ability to
identify which PIDs they need to listen to, based on the IP join (IGMP group
membership, or routing protocol - which only tells them the IP group
address and 
IP source address, and not the "MAC address" or in MPEG case "PID"
number on 
which it is carried. But surely in DVB - it may even be on a different
multiplex? 
How do we find where the IP multicast traffic is being sent?

It would even be possible to envisage a system in which the IP traffic was
only sent if there wer valid downstream receivers wishing to receive the 
particular flow. How should this be managed over a DVB system?

> My summary: an exciting and interesting topic but what is the target ? Just to
> save a few bytes to increase the bandwidth for
> IP ? Not enough. We have to think in services, applications. 100 Kbit/s more
> throughput is not a "unique selling proposition"
> because with a better service compression (Internet-MPEG-4-movies, MP3 vs. AAC,
> HTML text compression) I could have
> the same effect. More important, which type of connections or type of traffic
> profiles we have to support and how we could manage
> this. This seems to me as complex as the ATM challenge was and is (traffic
> engineering and management).
> I see a lot of opportunities, interesting and challanging items but does this
> effort is valuable ? Is a MPEG infrastructure the common
> basis of IP networking in future ? I do not think so. IP via MPEG remains the
> extension and supplement of digital TV or isn' it ?
> 

Well, DVB components are being used in many current and next generation systems
which do not carry any TV. They are purely IP services. Why DVB? -
Because it
allows the system to be upgraded / re-used in the future for TV? - Or just
because the technology has reached the mass market place? All "radio" 
systems need components - common designs are much cheaper...

> Sorry for my brains emission but I have wanted to chip in some ideas and
> thoughts. Do not hesitate to reflect to my "none-sense".
> 
> Best regards.
> 
> Torsten
> 
> Torsten Jaekel
> Product Marketing Datacasting
> Rohde & Schwarz FTK GmbH
> Wendenschlossstr. 168, Haus 28
> 12557 Berlin
> Germany
> Phone: +49 30 65 89 1 - 103
> FAX:     +49 30 65 55 02 21
> email: Torsten.Jaekel@FTK.rohde-schwarz.com
> 
> PS: Please, I apologize my English mistakes, not my native language and written
> quite in hurry.

From majordomo-owner Sun Oct 28 17:37:09 2001
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From: Patrick Cipiere <Patrick.Cipiere@udcast.com>
To: ip-dvb@erg.abdn.ac.uk
In-reply-to: <3BD87094.39C3E28A@erg.abdn.ac.uk> (message from Gorry Fairhurst
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Torsten.Jaekel@FTK.rohde-schwarz.com wrote:

> Imagine we transmit each IP connection in a dedicated DVB sub-channel,
> given by the PID

We only have 8191 PIDs, and in some cases like Eutelsat Skyplex, or
TDMA access, this number might be reduced to less than a hundred.
So the number of available PIDs might be an issue.

This might also raise some issues from the manufacturers. Currently
most of the cards do hardware filtering on only from 8 to 32 PIDs
simultaneously.
I am also using cards that do not hardware filter the PIDs, but leave
this task to the driver. With these  cards it is easier to deal with the
whole 8191 PIDs, but cost more cpu cycles.

I guess that some questions we will have to discuss on this
mailing-list are about layering:
- what is our layer 1?
  for me: it is MPEG2 TP (included) and under.
  it even can be MPE (included) and under.

Of course considering MPE as the layer 1 you need to encapsulate the
layer 2 (ethernet for example) using LLC_SNAP and RFC1483 with either
- Ethertype 0x6558 `transparent ethernet bridging'
- Bridged Ethernet/802.3
This is will add some extra bytes and therefore waste some bandwith,
but we get something that we might consider as a valuable information
with the IEEE 48 bits source MAC address (which is not in the MPE
datagram section).

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

From majordomo-owner Sun Oct 28 17:46:10 2001
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Gorry: in your document http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/
You say 

> Some missing functionality: e.g. arp, mcast, requiring additional
> features to complete the system design. 

Could you please explain what you mean by this?

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

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Patrick Cipiere wrote:
> 
> Torsten.Jaekel@FTK.rohde-schwarz.com wrote:
> 
> > Imagine we transmit each IP connection in a dedicated DVB sub-channel,
> > given by the PID
> 
> We only have 8191 PIDs, and in some cases like Eutelsat Skyplex, or
> TDMA access, this number might be reduced to less than a hundred.
> So the number of available PIDs might be an issue.
> 
> This might also raise some issues from the manufacturers. Currently
> most of the cards do hardware filtering on only from 8 to 32 PIDs
> simultaneously.

Yes, this current PID limit is true of other potential next generation 
schemes too.

I wonder how much this is due to the complexity of current MPE / DSM-CC
solutions? If we were to re-think this, I do wonder whether one
could come up with a scheme which significantly simplified the
re-assembly of IP datagrams and the information needed by the driver
or on-card processing that is needed to know which PIDs needed
to be forwarded by this particular receive interface. Is this
an interesting area?

> I am also using cards that do not hardware filter the PIDs, but leave
> this task to the driver. With these  cards it is easier to deal with the
> whole 8191 PIDs, but cost more cpu cycles.
> 

Yes - I also presume this offers a way to modify the IP protocol
processing with some existing cards. How much experience do you
have of this?

> I guess that some questions we will have to discuss on this
> mailing-list are about layering:
> - what is our layer 1?
>   for me: it is MPEG2 TP (included) and under.
>   it even can be MPE (included) and under.
> 
> Of course considering MPE as the layer 1 you need to encapsulate the
> layer 2 (ethernet for example) using LLC_SNAP and RFC1483 with either
> - Ethertype 0x6558 `transparent ethernet bridging'
> - Bridged Ethernet/802.3
> This is will add some extra bytes and therefore waste some bandwith,
> but we get something that we might consider as a valuable information
> with the IEEE 48 bits source MAC address (which is not in the MPE
> datagram section).
> 

Yes, that is, if you want to do a MAC level bridge, rather than 
full IP routing?

> Patrick.
> --
> UDcast: Full IP over Broadcast Media
> 
> Phone:  (+33) (0)4 93 00 16 99
> Mobile: (+33) (0)6 14 21 55 98
> Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

From majordomo-owner Mon Oct 29 14:08:48 2001
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Patrick Cipiere wrote:
> 
> Gorry: in your document http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/
> You say
> 
> > Some missing functionality: e.g. arp, mcast, requiring additional
> > features to complete the system design.
> 
> Could you please explain what you mean by this?
> 

There are three separate players, who each have raised this:

(i) DVB receiver developers.
The need is for DVB receivers to identify quickly and efficiently
the DVB multiplex associated with a received IP flow, and the
PIDs used to support this service. This assumes the IP service
uses multiple PIDs/transport multiplexes. Such mapping of IP 
address to PID could be performed using DVB tables.  Various proposals
were sent to DVB-SI DAT about this, some (not all) are in the list
archive. 

http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/docs/
http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/refs/

Whatever way this is done, future systems may have a need to
do this quickly and efficiently.

(ii) Non-TV DVB satellite
Some people use DVB as a bearer network, with little intent on 
providing full DVB services. These may be using it as a private
network - and simply want a standard transmission format. 
Since the mechanism is very similar to "arp" - then it could 
make sense to re-use the arp protocol, keeping this as an
IP-level function rather than a DVB-specific function. This
allows ip driver software-based processing as well.

(iii) Future non-DVB systems
In future, people building next generation systems may use
DVB, or may choose to use other (but similar) technologies:

http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/archive/msg00019.html

Such systems also need to work with satellites performing OBP
and with advanced QoS support. 

Providing a generic protocol solution could also help solve
this problem in similar, but, non-DVB systems. 

Other ideas?

Do we need one scheme? A few?

Gorry

> Patrick.
> --
> UDcast: Full IP over Broadcast Media
> 
> Phone:  (+33) (0)4 93 00 16 99
> Mobile: (+33) (0)6 14 21 55 98
> Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

From majordomo-owner Tue Oct 30 09:30:46 2001
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In-reply-to: <3BDD386E.5386DEB2@erg.abdn.ac.uk> (message from Gorry Fairhurst
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Patrick Cipiere wrote:

>> I am also using cards that do not hardware filter the PIDs, but leave
>> this task to the driver. With these  cards it is easier to deal with the
>> whole 8191 PIDs, but cost more cpu cycles.
>> 

Gorry wrote:

> Yes - I also presume this offers a way to modify the IP protocol
> processing with some existing cards. How much experience do you
> have of this?

Emmanuel Duros <Emmanuel.Duros@UDcast.com> and I already wrote 6
drivers for different DVB-S cards and manufacturers running with
FreeBSD. And we are currently coding a new one.
We try to make them as simple as usual ethernet drivers.
In fact we consider the driver as an ethernet layer 2 driver, and we
consider that RF/mpeg2/mpe are in layer 1.
By doing so, the DVB-S NIC card/driver fits nicely in the stack, with
standard ethernet interface with layer 3.

This might explain my previous remark about layering.

I strongly believe that we need a source MAC address, and this can be
solved today with LLC_SNAP and RFC1483.
This need is reinforced when using RFC3077 on this interface, because
you transform a unidirectional simplex interface into a duplex
interface.
The interface needs to be able to reject its own packets (received
250ms later).

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

From majordomo-owner Tue Oct 30 10:20:58 2001
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extract from ETSI document EN 301 192

> LLC_SNAP_flag: this is a 1-bit flag. If this flag is set to "1" the
> payload carries an LLC/SNAP encapsulated datagram following the
> MAC_address_1 field. The LLC/SNAP structure shall indicate the type of
> the datagram conveyed. If this flag is set to "0", the section shall
> contain an IP datagram without LLC/SNAP encapsulation. 

What about IPv4 vs IPv6?
Any opinions about the way `IP datagram' should be interpreted?

I think that LLC_SNAP_flag == 0 should (must?) be restricted to IPv4
(Ethertype 0x800) and for IPv6 LLC_SNAP_flag == 1 (Ethertype 0x86DD)

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

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On Tue, 30 Oct 2001, Patrick Cipiere wrote:

> extract from ETSI document EN 301 192
> 
> > LLC_SNAP_flag: this is a 1-bit flag. If this flag is set to "1" the
> > payload carries an LLC/SNAP encapsulated datagram following the
> > MAC_address_1 field. The LLC/SNAP structure shall indicate the type of
> > the datagram conveyed. If this flag is set to "0", the section shall
> > contain an IP datagram without LLC/SNAP encapsulation. 
> 
> What about IPv4 vs IPv6?

the first few bits of the IP header are the version number. Since you
know it's an IP datagram because the LLC_SNAP_flag is 0, you know to
pass it to code that will interpret it correctly based on
the content of the version number field.

If the LLC_SNAP_flag is 1, the LLC/SNAP encapsulation must identify
the content it is carrying. normal layering.


> Any opinions about the way `IP datagram' should be interpreted?
> 
> I think that LLC_SNAP_flag == 0 should (must?) be restricted to IPv4
> (Ethertype 0x800) and for IPv6 LLC_SNAP_flag == 1 (Ethertype 0x86DD)

but then you can't handle the encap/non-encap case.

I think your suggestion would break the existing mechanism, as well as
being unable to cope with any future version of IP beyond IPv6.

(I haven't seen the ETSI document you quote, but that extract seems
 quite sensible.)

I would guess that a reason IPv4 and v6 got given different
ethertypes was because a lot of existing IPv4 implementations just
didn't bother checking the IP header version field contents. Seems
like an unnecessary kludge to me.

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>




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From: Patrick Cipiere <Patrick.Cipiere@udcast.com>
To: L.Wood@eim.surrey.ac.uk
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	<Pine.GSO.4.21.0110301148540.8008-100000@phaestos.ee.surrey.ac.uk>
	(message from Lloyd Wood on Tue, 30 Oct 2001 12:04:29 +0000 (GMT))
Subject: Re: IP MPE payload
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Lloyd Wood wrote:

> the first few bits of the IP header are the version number.

I think I've already heard about this feature :-)

> Since you know it's an IP datagram because the LLC_SNAP_flag is 0,
> you know to pass it to code that will interpret it correctly based on
> the content of the version number field.

As you might expect, this is the way we handle this today.
But I don't like to decode layer 3 information in layer 2.

>> I think that LLC_SNAP_flag == 0 should (must?) be restricted to IPv4
>> (Ethertype 0x800) and for IPv6 LLC_SNAP_flag == 1 (Ethertype 0x86DD)

> but then you can't handle the encap/non-encap case.

No, I can handle both cases.

> I think your suggestion would break the existing mechanism,

No, I don't understand how this will break the existing mechanism.

> as well as
> being unable to cope with any future version of IP beyond IPv6.

Yes, if any future version of IP do not get a specific Ethertype.
Ethernet will face the same problem.

> I would guess that a reason IPv4 and v6 got given different
> ethertypes was because a lot of existing IPv4 implementations just
> didn't bother checking the IP header version field contents. Seems
> like an unnecessary kludge to me.

You are completely right.
If the IP stack can cope with the version field, we just have to send
the IP (v4 or v6) datagram to the IP layer.
Unfortunately most of the current IP stacks, are not ready for that.

So I guess we have to deal with it: we have 2 different Ethertype
values from IEEE for IPv4 and IPv6

0800 Internet IP (IPv4)        [IANA]
86DD IPv6                      [IANA]

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
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From majordomo-owner Tue Oct 30 15:17:27 2001
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On Tue, 30 Oct 2001, Patrick Cipiere wrote:

> Lloyd Wood wrote:
> 
> > the first few bits of the IP header are the version number.
> 
> I think I've already heard about this feature :-)

good to know I'm not making things up.


> > Since you know it's an IP datagram because the LLC_SNAP_flag is 0,
> > you know to pass it to code that will interpret it correctly based on
> > the content of the version number field.
> 
> As you might expect, this is the way we handle this today.
> But I don't like to decode layer 3 information in layer 2.

you decode layer 3 information in layer 3; because you know it's an IP
packet directly encapsulated, you pass it straight up the stack to the
layer-3 handling code. Many implementations work that way.


> >> I think that LLC_SNAP_flag == 0 should (must?) be restricted to IPv4
> >> (Ethertype 0x800) and for IPv6 LLC_SNAP_flag == 1 (Ethertype 0x86DD)
> 
> > but then you can't handle the encap/non-encap case.
> 
> No, I can handle both cases.

I don't follow this.

In your previous mail, you were suggesting redefining the bit from
indicating
(LLC_SNAP encap)/(raw IP datagram) to indicating
(raw IPv4 datagram)/(raw IPv6 datagram).

Which suggested you're after a convenient IP protocol indicator, and
do not need LLC_SNAP encapsulation - or have I misread your previous
email, or are you getting the information from somewhere else in the
header, suggesting that this bit may be redundant?

(I've downloaded ETSI EN 301 192 and am trying to translate the
datagram strucutre in the table on p13 into IETF/DoD ascii notation...
doesn't look like this bit is redundant unless e.g. private
descriptor/indicator or reserved MAC values are overloaded. And if
you're scrambling the payload do you really want to indicate what
you're carrying?

I have the suspicion that a misformatted Word table has messed up more
than one protocol spec...)


> > I think your suggestion would break the existing mechanism,
> 
> No, I don't understand how this will break the existing mechanism.

If that bit is the only way to indicate LLC/SNAP encapsulation, and it
is redefined to indicate IP protocol type (4/6), then LLC_SNAP
encapsulation cannot be indicated, yes?


> > as well as
> > being unable to cope with any future version of IP beyond IPv6.
> 
> Yes, if any future version of IP do not get a specific Ethertype.
> Ethernet will face the same problem.

they'll just define a new Ethertype (or reuse a value). 

> > I would guess that a reason IPv4 and v6 got given different
> > ethertypes was because a lot of existing IPv4 implementations just
> > didn't bother checking the IP header version field contents. Seems
> > like an unnecessary kludge to me.
> 
> You are completely right.
> If the IP stack can cope with the version field, we just have to send
> the IP (v4 or v6) datagram to the IP layer.
> Unfortunately most of the current IP stacks, are not ready for that.

Presumably you can snoop the payload and make the decision to pass it
to the stack, or discard it because thew stack doesn't support it,
yourself, if you're going to work with legacy stacks. (If you're
running separate IPv4 and IPv6 stacks on a box I suppose you probably
need to do that in your separate driver anyway.)

cheers,

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>




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Lloyd Wood wrote:

> you decode layer 3 information in layer 3; because you know it's an IP
> packet directly encapsulated, you pass it straight up the stack to the
> layer-3 handling code. Many implementations work that way.

Unfortunately this is not the case in the implementations I am using.
Have a look a net/if_ethersubr.c in FreeBSD, and net/ipv[46}/ip_input.c
in Linux.

> In your previous mail, you were suggesting redefining the bit from
> indicating
> (LLC_SNAP encap)/(raw IP datagram) to indicating
> (raw IPv4 datagram)/(raw IPv6 datagram).

By no way I want to redefine any bit. I just want to use it the
way the standard is designed.

LLC_SNAP_flag == 0 means payload raw IPv4
LLC_SNAP_flag == 1 means whatever is in the AAL5 (see  RFC1483)
                   if AAL5 Ethertype == 0x86DD then IPv6

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

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On Tue, 30 Oct 2001, Patrick Cipiere wrote:

> > In your previous mail, you were suggesting redefining the bit from
> > indicating
> > (LLC_SNAP encap)/(raw IP datagram) to indicating
> > (raw IPv4 datagram)/(raw IPv6 datagram).
> 
> By no way I want to redefine any bit. I just want to use it the
> way the standard is designed.
> 
> LLC_SNAP_flag == 0 means payload raw IPv4
> LLC_SNAP_flag == 1 means whatever is in the AAL5 (see  RFC1483)
>                    if AAL5 Ethertype == 0x86DD then IPv6

Ah, that's slightly clearer and I understand your previous mails
better...

...but then you wouldn't need the flag, since IPv4 has an Ethertype
anyway. And if you used the flag this way you'd favour IPv6 rather
than 4 - since IPv6 has bigger headers and MTU requirements, and
benefits from the added space resulting from removing the encap.

...but there is no mention of AAL5 in EN 301 192. Why would you want
the additional overhead of AAL5 encapsulation/checksumming etc - and
when you say 'the standard', which standard are you referring to?

...but DVB != ATM... going through AAL5 doesn't get you anywhere near
a decent IP over DVB encapsulation, and afaik DSM-CC doesn't have to
use AAL5 as the broadcast type. 

And EN 301 192 (V1.2.1 199-06) talks about IP, not IPv4.

still puzzled,

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>



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> ....but there is no mention of AAL5 in EN 301 192.

You are right. I should not have mentioned AAL5 (it just comes from
rfc1483)

In fact this is the extract from EN 301 192

  LLC_SNAP: this structure shall contain the datagram according to the
  ISO/IEC 8802-2 [11] Logical Link Control (LLC) and ISO/IEC 8802-1 [11]
  a SubNetwork Attachment Point (SNAP) specifications. If the payload of
  the section is scrambled (see payload_scrambling_mode), these bytes
  are scrambled.

As far as I know the LLC and SNAP used today are the same as described
in rfc1483.

Patrick.
-- 
UDcast: Full IP over Broadcast Media

Phone:  (+33) (0)4 93 00 16 99
Mobile: (+33) (0)6 14 21 55 98
Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

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I think we're moving on to an interesting topic...

Let me try to clarify a few points - especially for those
who do not have a copy of the EN 301 192 being quoted.

The EN implements a partial MAC service, and seems rather poor
on defining the mapping of IP onto it. See in-line comments below. 

Gorry

----

Lloyd Wood wrote:
> 
> On Tue, 30 Oct 2001, Patrick Cipiere wrote:
> 
> > > In your previous mail, you were suggesting redefining the bit from
> > > indicating
> > > (LLC_SNAP encap)/(raw IP datagram) to indicating
> > > (raw IPv4 datagram)/(raw IPv6 datagram).
> >
> > By no way I want to redefine any bit. I just want to use it the
> > way the standard is designed.
> >
> > LLC_SNAP_flag == 0 means payload raw IPv4
> > LLC_SNAP_flag == 1 means whatever is in the AAL5 (see  RFC1483)
> >                    if AAL5 Ethertype == 0x86DD then IPv6
> 
> Ah, that's slightly clearer and I understand your previous mails
> better...
> 
> ...but then you wouldn't need the flag, since IPv4 has an Ethertype
> anyway. And if you used the flag this way you'd favour IPv6 rather
> than 4 - since IPv6 has bigger headers and MTU requirements, and
> benefits from the added space resulting from removing the encap.
> 

The EtherType is not carried in the normal MPE header (without LLC).

> ...but there is no mention of AAL5 in EN 301 192. Why would you want
> the additional overhead of AAL5 encapsulation/checksumming etc - and
> when you say 'the standard', which standard are you referring to?
> 

There isn't a reference in the EN to an RFC describing IP over LLC/SNAP!!

> ...but DVB != ATM... going through AAL5 doesn't get you anywhere near
> a decent IP over DVB encapsulation, and afaik DSM-CC doesn't have to
> use AAL5 as the broadcast type.

The EN also doesn't permit a MAC Ether-Type without LLC or 
a MAC source address.  

The latest rev of EN 301 192 that I have seen is V1.1.1 (1997-08) 
In Chapter 7 (Multiprotocol encapsulation) subsection  7.1 
(Data transport specification), this says:

"The semantics of the datagram_section are as follows:
<snip> 

LLC_SNAP_flag: this is a 1-bit flag. 
If this flag is set to "1" the payload carries an LLC/SNAP encapsulated 
datagram following the MAC_address_1 field. The LLC/SNAP structure 
shall indicate the type of the datagram conveyed. If this
flag is set to "0", the section shall contain an IP datagram without 
LLC/SNAP encapsulation."

When the LLC flag is 0, the payload is an "IP datagram",
I don't see anything here which says this is IPv4 ONLY, but the
lack of an Ethertype field suggests this. 

An arp frame could also (potentially) be sent, but this would
have to be encapsulated in LLC.
- But I'm not sure this was anticipated.

> 
> And EN 301 192 (V1.2.1 199-06) talks about IP, not IPv4.

This is a nuisance. The EN appears to only support IPv4 without LLC/SNAP,
but this is NEVER explicitly stated. Indeed it didn't differentiate IPv4
or IPv6. There isn't even a ref to an IP RFC!!!!

> 
> still puzzled,
> 
> L.
> 
> <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>

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Thanks, 

Could I ask some questions to probe on other alternatives to the way
in which IP is sent over MPE?

Patrick Cipiere wrote:
> 
> Patrick Cipiere wrote:
> 
> >> I am also using cards that do not hardware filter the PIDs, but leave
> >> this task to the driver. With these  cards it is easier to deal with the
> >> whole 8191 PIDs, but cost more cpu cycles.
> >>
> 
> Gorry wrote:
> 
> > Yes - I also presume this offers a way to modify the IP protocol
> > processing with some existing cards. How much experience do you
> > have of this?
> 
> Emmanuel Duros <Emmanuel.Duros@UDcast.com> and I already wrote 6
> drivers for different DVB-S cards and manufacturers running with
> FreeBSD. And we are currently coding a new one.

Useful experience.

> We try to make them as simple as usual ethernet drivers.
> In fact we consider the driver as an ethernet layer 2 driver, and we
> consider that RF/mpeg2/mpe are in layer 1.
> By doing so, the DVB-S NIC card/driver fits nicely in the stack, with
> standard ethernet interface with layer 3.
> 
> This might explain my previous remark about layering.
> 
> I strongly believe that we need a source MAC address, and this can be
> solved today with LLC_SNAP and RFC1483.

Agreed, can be solved in this way in current MPE.

The use of LLC/SNAP adds to the payload overhead, it doesn't seem to
add significantly to the capability - although, like in Ethernet,
you're perfectly entitled to use it, if you wish. Have I missed
something?

If we are contemplating redefining the IP service over DVB, though we
may not necessarily choose to do it this way.

> This need is reinforced when using RFC3077 on this interface, because
> you transform a unidirectional simplex interface into a duplex
> interface.
> The interface needs to be able to reject its own packets (received
> 250ms later).

This, I think is based on the UDLR approach, which is essentially a 
LAN solution rather than native IP solution. It is well-suited to 
some important application scenarios, but not all.

Some people have another view of how such networks should operate.
There are various flavours - those doing backbone routing, those with
two-way DVB services. 

Two alternative viewpoints: 

(i) Some people have argued for a full MAC 
	- source and destination IP address with EtherType.
(ii) Others could manage quite well with no MAC address, and will 
use IP routing (or some other scheme to address DVB end points).

I believe most networks will benefit from an EtherType - this doesn't
preclude the use of this to denote LLC/SNAP if you so desire, it also
provides a good access point for differentiating IPv4 and IPv6
datagrams, support for a flavour of arp (how that works without
MAC addresses, and how it relates to PIDs and MPEG-multiplexes is 
at the moment an open issue?)

How important is the EtherType field in compression schemes like ROHC?

> 
> Patrick.
> --
> UDcast: Full IP over Broadcast Media
> 
> Phone:  (+33) (0)4 93 00 16 99
> Mobile: (+33) (0)6 14 21 55 98
> Fax:    (+33) (0)4 93 00 16 61                 http://www.UDcast.com

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On Wed, 31 Oct 2001, Gorry Fairhurst wrote:

> Let me try to clarify a few points - especially for those
> who do not have a copy of the EN 301 192 being quoted.

register at www.etsi.org and you get three free downloads. That's
how I got my pdf copy... the latest copy is 1999 1.2.1, btw.


Patrick suggested:
> > > LLC_SNAP_flag == 0 means payload raw IPv4
> > > LLC_SNAP_flag == 1 means whatever is in the AAL5 (see  RFC1483)
> > >                    if AAL5 Ethertype == 0x86DD then IPv6
> > 
> > Ah, that's slightly clearer and I understand your previous mails
> > better...
> > 
> > ...but then you wouldn't need the flag, since IPv4 has an Ethertype
> > anyway. And if you used the flag this way you'd favour IPv6 rather
> > than 4 - since IPv6 has bigger headers and MTU requirements, and
> > benefits from the added space resulting from removing the encap.
> > 
> 
> The EtherType is not carried in the normal MPE header (without LLC).

Yes, you would need an Etherype-aware encap in there.


> > ...but there is no mention of AAL5 in EN 301 192. Why would you want
> > the additional overhead of AAL5 encapsulation/checksumming etc - and
> > when you say 'the standard', which standard are you referring to?
> > 
> 
> There isn't a reference in the EN to an RFC describing IP over LLC/SNAP!!

no change there in the latest version. they presume IP (4 and 6) is
carried raw.

> The latest rev of EN 301 192 that I have seen is V1.1.1 (1997-08) 

the 1999 copy is available from www.esti.org after you jump through
some annoying give-details hoops.

> > And EN 301 192 (V1.2.1 199-06) talks about IP, not IPv4.

1999-06, sorry.


> This is a nuisance. The EN appears to only support IPv4 without LLC/SNAP,
> but this is NEVER explicitly stated. Indeed it didn't differentiate IPv4
> or IPv6. There isn't even a ref to an IP RFC!!!!

...and they make me register to read it, so I thought it was going to
be GOOD!

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>