2 edits | [Connectivity] Loss of connection, T4 timeouts Split from another thread where it was off topic. sortofageek 
said by n_w95482:That looks similar to what's happening with me, similar time of the day as well. In my case, it's intermittent bursts of noise in the cable plant that is knocking out the upstream channels. If I catch the modem signal page right before it reboots, I can often see the upstream power level shooting up 5-8 dBmV.
I have also been seeing this a lot the last 2 weeks. Lots of reboots due to T4 timeouts. Sometimes several times an evening. A few times I happen to log into the modem and noticed the upstream was up to 52 or 53 and then the modem would reboot, a little later the upstream was back to where it usually is at 46. There were 3 days in a row where it happened at 2:12 in the afternoon, which seems an odd time to do maintenance that knocks people off the internet.
Seems to be improving so far this week, only 1 reboot during the day. Almost went and got a 6141 to replace my 6121 but think I'll hold off for now. |
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9
1 recommendation | Re: SB6121 Reboots said by mrschultz02:I have also been seeing this a lot the last 2 weeks. Lots of reboots due to T4 timeouts. Sometimes several times an evening. A few times I happen to log into the modem and noticed the upstream was up to 52 or 53 and then the modem would reboot, a little later the upstream was back to where it usually is at 46. That's your problem. The T4's are being generated due to the high / fluctuating upstream power level. |
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boehmb
join:2003-04-21
Glenview, IL | reply to mrschultz02
Re: Loss of connection, T4 timeouts Comcast came out and said they fixed the problem on their end and my T4 timeouts and signal fluctuations are gone. Thanks Comcast. |
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| Mine have also gone away, without doing anything at all on my end.
Last few weeks I've been back to the normal one or 2 reboots a week. |
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EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9 | said by mrschultz02:Mine have also gone away, without doing anything at all on my end.
Last few weeks I've been back to the normal one or 2 reboots a week.
For curiosity, what do your upstream power levels look like now ? |
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| Upstream levels are about the same as they have been for the last 2 years, mostly 46 and 47, sometimes 48db. That's where they were most of the time during the 2 weeks of lots of timeouts, I would only see the higher values if I happened to look at them right before a reboot.
I didn't notice (or don't remember) what the downstream was doing when I saw the spikes in upstream, those usually fluctuate between 1 and 4. |
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| reply to mrschultz02
Re: [Connectivity] Loss of connection, T4 timeouts It's been a week since my last reboot, the longest trouble-free period since the middle of June. I'm really hoping it's gone for good...
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KI6RIT |
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