aswinkumar's profile

New Poster

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4 Messages

Mon, Dec 7, 2020 2:00 PM

Upload stream bonded channel not locked

Hi

I replaced my modem recently (Motorola MB8600) and as i look through the error log, i am seeing messages such as "16 consecutive T3 timeouts while trying to range on upstream channel 4" and 16 consecutive T3 timeouts while trying to range on upstream channel 3" and those two channels are not locked.

 

I have tried cleaning out cables, double checking connections to the modem and as far as i know there are no splitter in the house. From what i have read, upstream power level is too high and i have reached to out tech support with no luck. Can someone shed light on what might be going on?

 

FYI, I previously had a Arris SB6183 and it has no issues locking on to channels.

 

aswinkumar_0-1607378424747.png

 

 

 

Responses

EG

Expert

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87K Messages

6 m ago

Can't see your pic. Since you are a new poster, it needs to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting it at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to it here.

 

Or copy all of the text of the status page and paste it into the body of your next post here.

 

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New Poster

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4 Messages

6 m ago

Modem connection status & snipped from the event log

https://imgur.com/a/nfit8sg

 

Thanks

 

 

andyross

Silver Problem Solver

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6.9K Messages

6 m ago

Upstream signal is on the high side, but not all that bad. I've personally had 58dB and it was still working!!

The not-locked are the two lowest frequencies. It's possible there may be too much noise on those lowest frequencies.

New Poster

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4 Messages

6 m ago

Thanks, Is there anything else that i could do. I have already cleaned up connections, double/ triple checked them with same results.

EG

Expert

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87K Messages

6 m ago

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

 

You didn't post the downstream channels..

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

 

Good luck !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!tick

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