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Re: Voice over AAL2, Why?

  • From: "J.P. Foster" <jpfoster@cadence.com>
  • Date: Mon, 10 Apr 2000 10:19:58 +0100
  • Organization: Cadence Design Systems, Inc.

Rodney wrote:
> 
> The beauty of AAL2 is that 44 bytes is perfect for PCM voice. You can
> perfectly fill a cell with traffic, so there is minimal overhead and
> latency. With AAL5/VoIP, you must must either add huge amounts of
> latency or incur huge amounts of overhead. AAL2 offers toll quality
> voice today.
>

So what you are saying is that your AAL2 layer processing is optimized 
for 44 byte payloads (PCM), this simplifies the AAL2 processing
significantly
so that it is only marginally more complicated than say AAL1.

Which is naughty in that you are not allowing variable payloads but I
understand
why you are doing it because the processing of AAL2 is enormous.

How do the standards people react to optimizations of this sort?

> Rodney Boles
> Jetstream Communications
> 
> Sent via Deja.com http://www.deja.com/
> Before you buy.
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