Contributor
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17 Messages
My MB8611 Frequently Restarts, Takes Forever to Startup // High Number of Corrected Errors on OFDM PLC Downstream Channel // T3 Timeouts
I recently upgraded to 1.2gb internet with a Motorola MB8611, however I'm having frequent connection/restart issues.
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Accepted Solution
EG
Expert
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111.5K Messages
4 years ago
The error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment somewhere.
There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !
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Accepted Solution
shaun_y
Contributor
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17 Messages
4 years ago
Final update: Tech just finished. There was a noise filter on the outside line. Tech fixed the issue, my line is clean now, all upstream channels connect, speeds are good, connection is stable, nothing at all in the event log. Perfect.
If you're having this same issue, make a forum post, DM support, schedule a tech.
Thank you!
(edited)
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shaun_y
Contributor
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17 Messages
4 years ago
Further information: No splitters, no routers. Issue persisted with both a 50ft coaxial cable and with the ~10ft cable sent by Xfinity. After power cycling the modem multiple times, eventually it will connect, although it takes 10-20 minutes to do so. After a couple hours, the T3 disconnects begin again.
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shaun_y
Contributor
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17 Messages
4 years ago
A few minutes after making this post, modem restarted again. However, this restart was very quick for the first time ever, less than a minute. Hoping there's been some improvement..
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shaun_y
Contributor
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17 Messages
4 years ago
Update later in the day: a few more random restarts, with long delays. Still can't get more than one upstream channel to lock.
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It may be noteworthy to mention that after a large multi-day power outage about a year ago, intermittent disconnections began to occur. However, that was on an older and slower connection/modem, and those disconnections usually lasted about half a minute. Prior to that large power outage, I had never had any connection issues here.
Perhaps my current issues are the same as the old ones, although now exacerbated by a more powerful connection.
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shaun_y
Contributor
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17 Messages
4 years ago
Update: a tech is coming out tomorrow; will update with more information, to help anyone else with this issue.
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