Ascend Archive
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Re: (ASCEND) Am I the only one ??
At 06:10 AM 9/29/98 , Jim Howard wrote:
>At 09:32 1998/09/29 +1100, Neale Banks wrote:
>>It's a minor point and presumably quite separate from the original question
>>of why we see so much 28.8k (as distinct from <28.8k) on the back-channel
>>and never >28.8k. In fairness, I've just now found one session running
>>44k/24k - but it is the first I've seen at <28.8k and if line quality were
>>an issue then surely we'd be seeing a significant number <28.8k?
>
>In testing with the 6.0 beta releases I had V.90/K56flex disabled
>and dialed in with several V.90, K56flex, and V.34 modems.
>I found that several of them would get 33.6/33.6 or 33.6/31.2,
>but once I turned the 56k protocols back on, the upstream (back channel)
>on all of them was either 28.8 or 26.4...
As Matt pointed out, this is as expected. With K56Flex connections, the
symbol rates supported for the upstream direction allowed upto 33.6
connect rates - but the code was developed to be less aggressive with
respect to attaining these rates due to potential issues with interference
to the downstream. With V.90, the symbol rates that support 31200 and 33600
are optional and *apparently* none of the V.90 vendors have implemented
them (partly citing the same reasons).
Kevin Smith (kevin@ascend.com)
Ascend Communications...
...where Network Solutions never end.
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