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Technology Stocks : COM21 (CMTO)
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To: Frank A. Coluccio who wrote (2160)6/5/2000 10:11:00 AM
From: Mark Laubach  Read Replies (2) of 2347
 
With regards to 64Kbps PCM encoding. It has several
benefits which include complete toll quality and
handling of all legacy modems and FAX, it is a constant
bit rate data stream which is real easy to schedule
in the upstream. You just know it is going to work.

I agree that there are codec's now that support varying
degress of compression so as to make more efficient use
of the upstream bandwidth. However, the more the signal
is compressed, the more bursty the packets become due to
the size and temporal varying of silence intervals. CBR
no longer is appropriate for scheduling. My own belief
is that there may have to be some over scheduling to
compensate for not incurring too many round trip times
for scheduling bursty arrivals, which would take back
some of the efficiency gains. I'm waiting to see what
happens as the industry gains experience. I could be
off on this, but I am suspicious, especially on moderately
loaded upstream channels.

For now, 64Kbps PCM works. Compression is definitely on
the way (in the industry). I just don't have numbers that
tell me what the real gains and quality tradeoffs are for
the various levels of compression.

Mark
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