Hi all. I have gigabit service (1000/35), with a moto mb8600 modem.
Downstream speeds generally seem fine. Upload has always been below spec -- generally between 10-20mbs.
In the last few months, we've had increasingly frequent connection drops -- I have to reboot the modem, which can take multiple attemts, and usually takes 5+ minutes to reconnect.
I (finally) decided to look into it. The modem logs are filled with T3 timeout errors:
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15:51:44
Fri Jul 17 2020 |
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Critical (3) |
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16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:51:54
Fri Jul 17 2020 |
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Critical (3) |
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No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:51:54
Fri Jul 17 2020 |
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Critical (3) |
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Ranging Request Retries exhausted;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:51:54
Fri Jul 17 2020 |
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Critical (3) |
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16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:54:39
Fri Jul 17 2020 |
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Critical (3) |
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No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:54:39
Fri Jul 17 2020 |
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Critical (3) |
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Ranging Request Retries exhausted;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:54:39
Fri Jul 17 2020 |
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Critical (3) |
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16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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15:54:40
Fri Jul 17 2020 |
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Critical (3) |
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No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:70:9c;CMTS-MAC=00:01:5c:79:38:55;CM-QOS=1.1;CM-VER=3.1; |
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and so forth -- this is constant. The connection page describes 4 upstream channels, only one of which is locked:
|
|
| 1 |
Not Locked |
SC-QAM |
93 |
5120 |
17.3 |
35.8 |
| 2 |
Not Locked |
SC-QAM |
94 |
5120 |
23.7 |
44.8 |
| 3 |
Not Locked |
SC-QAM |
95 |
5120 |
30.1 |
39.5 |
| 4 |
Locked |
SC-QAM |
96 |
5120 |
36.5 |
46.3 |
|
power levels fluctuate a bit, and I've seen them above 50.
We just have internet, so a single cable enters the house and runs to the modem; no splitters, etc. There's a longish cable run accross my backyard (been there for 20+ years at least; predates us being in the house). I suspect that old cable was damaged in a storm at some point.
Anyone have suggestions, or guidance on how to quickly get talking to a tech support person?
