Xfinity plant
Community Forum
Xfinity globe

T3/T4 Errors- Everyday at the same time

New Poster

T3/T4 Errors- Everyday at the same time

For the past 2 weeks.  The cable modem (SB6141) reboots between 930am and 11am, based on the modem logs.  Spoke with customer service and chatted, problem still exists.

Current Cable Data

Downstream Power -11 dBmV

SNR 36dB

Upstream Power 50 dBmV

 

Nothing has changed in the house for years.

 

Any thoughts?  Is this something coming from Comcast every morning?

 

The following messages are on the log:

No Ranging Response Received - T3 time out

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportinities received T4 time out

Unicast Maintenance Ranging Attempted - No response - Rertries exhausted

Ranging Request Retries exhausted

 

Thanks for any help.

Valued Contributor

Re: T3/T4 Errors- Everyday at the same time

Your downstream levels are sort of low at -11 and your SNR at 36 is borderline.  50 isn't ideal for your upstream either but it isn't to a point where it would be causing service issues.  It might be worth your time to have the line checked out as it certainly looks like the signal to your modem could be improved.  

New Poster

Re: T3/T4 Errors- Everyday at the same time

OK - but why every morning around 930 - 1030am does the modem reboot? Seems like something on Comcast end causing it to reset?

Expert

Re: T3/T4 Errors- Everyday at the same time

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.


New Poster

Re: T3/T4 Errors- Everyday at the same time

Wiring should be in good shape.  We have only one splitter from the pole.  Connections outside look good and corrosion free.

 

Attached is additional data from the cable modem.

Expert

Re: T3/T4 Errors- Everyday at the same time

Your stats are marginal. The goal is to try to obtain some wiggle room to allow for intermittent fluctuations.

 

You may want to consider getting a tech visit to investigate. Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.