Re: IESG WG Review: IP over DVB (ipdvb)

[Lloyd Wood <l.wood@eim.surrey.ac.uk>]

On Wed, 22 Oct 2003 alain.ritoux@6wind.com wrote:

> >>  ... Snip
> >>
> >>The current list of work items is:
> >>
> >>1. Issue an Internet Draft specifying Requirements and Framework for
> >>supporting IP services via MPEG-2 transmission networks. Such requirements
>
> So, its is more IP-over-MPEG2 rather tah IP-over-DVB. Am I correct ?

I would say IP-over-MPEG transport streams in general (MPEG-4 is out
there, there are others. MPEG-7, anyone?)

> >> ... Snip
> >>2. The working group will investigate and design an efficient encapsulation
> >>method for IPv4/IPv6, and advance this via the IESG to a standards-track
> >>RFC. The design needs to consider the need for MAC addresses, the potential
> >>need for synchronisation between streams, support for IPv6 and multicast
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Is there not a risk of mixing different layers ? because this notion is
> more a DVB one ?
>
> Are the systems over MPEG-2 such as DVB, ATSC, ISDB-T ... compatible in
> terms of stream synchronisation ?
>
> Anyway, what is the purpose of such sync between IP flows and other
> streams ?

multiplexing of different traffic types.

> or between IP flows ? shouldn't it be more a pb to be solved
> at application and/or transport level (using RTP) rather than at a
> newtork level ?

RTP can't solve it; you're already IP at that point..

L.

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