Thanks for taking the time to respond to my post.
How do you pin point the cause of this fault? I have a technician coming out in a few days from Virgin Media, knowing my luck when the technician arrives, all the power levels will be stable.
Quote:
Originally Posted by MUD_Wizard
Noise on the upstream, causing the modem to keep increasing upstream power levels as the CMTS cannot hear it. So the upstream power eventually maxes out at 54 dBmV. Which is the maximum power level for two 64 QAM upstreams.
You will likely see T3 and/or T4 timeouts (disconnections on the upstream) in your network log as well when this happens, though it is not guaranteed. The modem may stay online at that power level.
---------- Post added at 05:43 ---------- Previous post was at 05:37 ----------
Naturally because both the hub and Tivo have Docsis modems inside that work the same way, with the same relative power limitations to the number of upstream channels and the modulation being used.
When the upstream power is maxed out you may be getting very low download speeds.
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---------- Post added at 07:49 ---------- Previous post was at 07:44 ----------
Power levels 07:49.
Downstream Channels
Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 9 315000000 Hz 256 QAM 5.9 dBmV 38.6 dB 3684 819
Locked 3 267000000 Hz 256 QAM 5.6 dBmV 38.3 dB 14187 753
Locked 4 275000000 Hz 256 QAM 5.5 dBmV 38.3 dB 2129 843
Locked 5 283000000 Hz 256 QAM 5.7 dBmV 37.9 dB 1325 765
Locked 6 291000000 Hz 256 QAM 5.7 dBmV 39.0 dB 872 660
Locked 7 299000000 Hz 256 QAM 5.8 dBmV 39.4 dB 776 571
Locked 8 307000000 Hz 256 QAM 5.6 dBmV 39.4 dB 872 694
Locked 10 323000000 Hz 256 QAM 6.3 dBmV 39.9 dB 1191 1024
Upstream Channels
Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 34 35800000 Hz ATDMA 42.3 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
NotLocked 0 0 Hz 0 dBmV 0 Ksym/sec
Locked 35 27400000 Hz ATDMA 41.8 dBmV 64QAM 6400000 Hz 5120 Ksym/sec
---------- Post added at 07:51 ---------- Previous post was at 07:49 ----------
TiVo power level.
Return Power: 41dBmV
SNR: 40dB