Quote:
Originally Posted by Sephiroth
A primer (I hope).
It's all suitably complex. You have a two way circuit from your perspective.
Downstream power is needed to send data TO you from the server (CMTS). Upstream power is needed to send data to the cable modem FROM the CMTS.
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Just a quick correction (and thanks to Broadbandings for his adjustments to my primer).
Upstream power is needed to send data to the CMTS from the cable modem.
---------- Post added at 09:22 ---------- Previous post was at 08:40 ----------
So the engineer came in the early afternoon on 03-Feb? And that's the current event log - nothing happened since in the log?
Upstream problems could have been explained against the T3 timeouts. Just why a downstream attenuator would correct that is beyond me (but my good friend BBings might have a suggestion based on his vastly greater depth of knowledge).
I noted also the downloaded configuration file on 02-Feb, which I take to be for 64QAM downstream modulation, but we can't see if you were 256QAM provisioned prior to that. It doesn't really speak to the upstream numbers but lurking there may be some significance. The 64QAM modulation allows greater downstream SNR tolerance (35 dB isn't great but is supposed to be more than OK for 64QAM).
What is significant to my reading is the number of codeword errors. You should look at your stats again, and if the numbers are rising, you have a problem that needs attention. At simplest, your modem could be faulty or there are loose/intermittemt connections somewhere, or noise ingress or something wrong in the cabinet.
To my simple mind, if your downstream is OK and your modem power/SNR are OK, then the codewords issue could be a combiner/splitter issue at the street cabinet. But I'm here, BBings is watching and the engineer needs to be there with some of these comments laid before him in advance.
HTH.