Quote:
Originally Posted by Joxer
Interesting figures - oversubsciption would normally affect the upload too, UBR issues would normally also affect the upstream as well (poor SNR on u/s), so it looks like a local issue as are 90% of slow speed calls.
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Hi,
Why would downstream oversubscription affect upstream, the two are, as far as I'm aware, completely discrete channels, the only commonality being TCP connections which use both. As downstream oversubscription doesn't have as dramatic an effect on latency as upstream oversubscription even a quite badly oversubscribed downstream is still more than able to support the upstream rates VM provide.
Those were my understanding anyway. Ditto uBR issues, it's quite possible to have issues with the downstream port on the CMTS card, the upconverter if it's a non-integrated card, or the FPM, none of which affect upstream.
If you know better please do let me know.