Re: [RE] Technical Feasibility & Current Work
John:
I was just in attendance today at an ITU-T SG16 mtg where they are creating documents for
an end to end QoS and signaling system for both real time voice and video conferencing.
They are in the creation phase of crafting an elaborate solution of path awareness and
call blocking in their new draft spec "H.priority" which is attached. This is applying a
version of the prioritization scheme as have you have stated in your note and it would
appear to be a "multi banana" (read $$$ to the new subscribers to this reflector) ).
Reminds me of the priority levels in 802.5 token ring and 3BNet (offshoot of early
Ethernet work)
I first attended this group in the early nineties when they began their work on H.323 for
non-QoS LAN videoconferencing.
Bottom line, after many meetings and pages of documents, not much progress in over 15
years.
Also, there are two published and therefore copyrighted ITU specs that I wish to send to
this reflector as soon as I determine the distribution limitations. Some of you may have
access to ITU documents so those docs are H.360 and G.1010.
Both of these address applications requirements for multimedia LANs which can be helpful
for our work as we move forward.
Richard
John Gildred wrote:
> One of the limitations in the current 802.3 specification is that there
> is no way to say "I need 20Mbps for my application until I say stop or
> timeout". This is absolutely necessary for AV across a point to point
> link (and eventually over a bridge). Currently priorities allow you to
> say "I need my application to be priority x" which may or may not be
> higher than other applications. And if two applications choose to use
> the same priority, then they will inevitably step on each other. Trying
> to manage this at higher levels (higher than 802.3) is much more
> difficult and expensive.
>
> Deterministic latency is also necessary. This is not just a problem
> over a bridge, as a point to point link has several applications on
> each side competing for the pipe at a given moment.
>
> -John Gildred
> Vice President of Engineering
> Pioneer Research Center USA
> A Division of Pioneer Electronics
> 101 Metro Drive, Suite 264
> San Jose, California 95110
> john@pioneer-pra.com
> (408) 437-1800 x105
> (408) 437-1717 Fax
> (510) 295-7770 Mobile
H.priority.zip
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