Community Forum

intermittent loss of connectivity T3 timeouts all throughout the day

Highlighted
New Poster

intermittent loss of connectivity T3 timeouts all throughout the day

Similar to this case, I am also experiencing this problem:

https://forums.xfinity.com/t5/Your-Home-Network/Intermittent-quot-No-Ranging-Response-received-T3-ti...

 

At least a handful of times a day we experience downtime from the modem and it is difficult to troubleshoot why.   I have a router behind the modem and also experienced intermittent connectivity loss without the router in the mix.

 

What should I do next?

 

Thanks.

 

event log timeouts:

 

Thu Jun 25 17:10:45 2020 Notice (6) TLV-11 - unrecognized OID;CM-MAC=b0:77:ac:92:55:df;CMTS-MAC=00:01:5c:6b:86:4a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Notice (6) WiFi Interface [wl0] set to Channel 40 (Side-Band Channel:36) - Reason:INIT
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Tue Jun 23 12:43:18 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:77:ac:92:55:df;CMTS-MAC=00:01:5c:6b:86:4a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Mon Apr 27 17:43:47 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:77:ac:92:55:df;CMTS-MAC=00:01:5c:6b:86:4a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out

 

Status - Connection

The statuses listed show the connection state of the cable modem contained within the SBG6580. They are used by your service provider to evaluate the operation of the cable modem.

 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel   Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK  
Security Enabled BPI+

 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 34 645000000 Hz -3.7 dBmV 39.5 dB 0 0
2 Locked QAM256 35 651000000 Hz -4.6 dBmV 39.0 dB 0 0
3 Locked QAM256 36 657000000 Hz -5.2 dBmV 38.3 dB 0 0
4 Locked QAM256 37 663000000 Hz -6.6 dBmV 38.2 dB 0 0
5 Locked QAM256 38 669000000 Hz -5.4 dBmV 38.9 dB 0 0
6 Locked QAM256 39 675000000 Hz -3.4 dBmV 38.9 dB 0 0
7 Locked QAM256 40 681000000 Hz -3.4 dBmV 39.0 dB 0 0
8 Locked QAM256 41 687000000 Hz -3.0 dBmV 38.9 dB 0 0

Upstream and downstream activity:
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 34 5120 Ksym/sec 30100000 Hz 51.0 dBmV
2 Locked ATDMA 33 5120 Ksym/sec 36500000 Hz 52.5 dBmV
3 Locked ATDMA 35 5120 Ksym/sec 23700000 Hz 50.0 dBmV
4 Locked ATDMA 36 5120 Ksym/sec 17300000 Hz 49.2 dBmV
Highlighted
Expert

Re: intermittent loss of connectivity T3 timeouts all throughout the day

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, and latency problems.

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.



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!
Highlighted
New Poster

Re: intermittent loss of connectivity T3 timeouts all throughout the day

thanks for this comment it is super helpful as I am very inexperienced here in troubleshooting anything from the street.

 

I found a single splitter inside the house, in my basement, which is an antronix 2-way splitter, with 2 jacks for -3.5db out.  Is this splitter any good?  Any opinion on it?

 

I feel like at this point I have reached my limit in what I can troubleshoot, other than replacing that splitter and may reach out to support to come out.  Unless you think I should just buy a new splitter in replacement of this one.  I am not sure I can go without this splitter as its bringing connectivity into my basement as well as my home.

 

Thanks though, for the thorough response.

Highlighted
Expert

Re: intermittent loss of connectivity T3 timeouts all throughout the day

It's a good quality brand splitter but it may be malfunctioning. Who knows. YMMV. You could certainly try swapping it out.



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!