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Connection interrupt intermittently

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New Poster

Connection interrupt intermittently

My connection got disconnected intermittently, not sure why.

I hvae changed another mode, and the issue keeps the same, it happends recently after an outage in my area Tuesday.

Event log:

TimePriorityDescription
2020-11-12, 17:03:23Notice (6)Honoring MDD; IP provisioning mode = IPv6
2020-11-12, 17:02:37Critical (3)No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:02:30Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:02:28Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:02:18Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:02:11Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:00:56Notice (6)Honoring MDD; IP provisioning mode = IPv6
2020-11-12, 17:00:20Critical (3)No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:00:13Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:00:11Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 17:00:01Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:59:35Notice (6)Honoring MDD; IP provisioning mode = IPv6
2020-11-12, 16:59:05Critical (3)No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:58:59Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:58:49Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:58:41Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:57:27Notice (6)Honoring MDD; IP provisioning mode = IPv6
2020-11-12, 16:56:46Critical (3)No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:39Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:29Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:21Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:20Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:15Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:14Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:56:04Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:57Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:56Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:46Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:39Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:38Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:28Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:55:21Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:54:01Notice (6)Honoring MDD; IP provisioning mode = IPv6
2020-11-12, 16:53:25Critical (3)No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:53:19Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:53:18Critical (3)No UCDs Received - Timeout;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:53:08Warning (5)Lost MDD Timeout;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:53:00Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:52:59Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;
2020-11-12, 16:52:57Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:59:c0:05:4e:60;CMTS-MAC=00:01:5c:ae:bc:8d;CM-QOS=1.0;CM-VER=3.0;


Here is the current signal status:

 

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel447000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)
 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25642447000000 Hz-14.9 dBmV36.4 dB1380
2LockedQAM25643453000000 Hz-16.4 dBmV35.2 dB540
3LockedQAM25644459000000 Hz-16.3 dBmV35.3 dB410
4LockedQAM25645465000000 Hz-16.1 dBmV35.4 dB7310
5LockedQAM25638471000000 Hz-16.2 dBmV35.4 dB4750
6LockedQAM25639477000000 Hz-17.1 dBmV34.7 dB440420
7LockedQAM25640483000000 Hz-16.9 dBmV34.9 dB77170
8LockedQAM25641489000000 Hz-17.9 dBmV34.1 dB78540
9LockedQAM25633495000000 Hz-17.8 dBmV34.2 dB53300
10LockedQAM25634507000000 Hz-16 dBmV35.2 dB2029660
11LockedQAM25635513000000 Hz-16.8 dBmV34.9 dB369780
12LockedQAM25636519000000 Hz-17 dBmV34.7 dB1826640
13LockedQAM2561525000000 Hz-17.3 dBmV34.4 dB944350
14LockedQAM2562531000000 Hz-17.6 dBmV34.2 dB77640
15LockedQAM2563537000000 Hz-17 dBmV34.7 dB205700
16LockedQAM2564543000000 Hz-17 dBmV34.6 dB9392460
 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 Ksym/sec22800000 Hz57 dBmV
2Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
3Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
4Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
Highlighted
Expert

Re: Connection interrupt intermittently

Everything is out of spec ! That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of 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.



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I am a Customer Expert volunteering my time to help other customers here in the Forums.
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New Poster

Re: Connection interrupt intermittently

Thanks a lot @EG , I also doubt about the slipters, I just removed on spliters and seems right now looks muck better.

ProcedureStatusComment
Acquire Downstream Channel633000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)
 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25617633000000 Hz-10.1 dBmV37.1 dB34771131
2LockedQAM25618639000000 Hz-10.1 dBmV37.2 dB33891038
3LockedQAM25619645000000 Hz-10.2 dBmV37.2 dB32061108
4LockedQAM25620651000000 Hz-10.2 dBmV37 dB31171121
5LockedQAM25621657000000 Hz-11.2 dBmV36.6 dB32581195
6LockedQAM25622663000000 Hz-11.8 dBmV36.3 dB33651139
7LockedQAM25623669000000 Hz-11.1 dBmV36.7 dB31631006
8LockedQAM25624675000000 Hz-11.2 dBmV36.3 dB31801141
9LockedQAM25625681000000 Hz-11.7 dBmV36.5 dB34131168
10LockedQAM25626687000000 Hz-11.7 dBmV36.4 dB33991093
11LockedQAM25627693000000 Hz-12.4 dBmV36 dB35111231
12LockedQAM25628699000000 Hz-12.7 dBmV35.9 dB34911355
13LockedQAM25629705000000 Hz-11.7 dBmV36.4 dB33941037
14LockedQAM25630711000000 Hz-11.4 dBmV36.6 dB33271044
15LockedQAM25631717000000 Hz-12 dBmV36.3 dB31821217
16LockedQAM25632723000000 Hz-11.8 dBmV36.2 dB31381033
 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 Ksym/sec22800000 Hz54 dBmV
2LockedATDMA15120 Ksym/sec35600000 Hz54 dBmV
3LockedATDMA25120 Ksym/sec29200000 Hz54 dBmV
4LockedATDMA45120 Ksym/sec16400000 Hz54 dBmV
Highlighted
Expert

Re: Connection interrupt intermittently

It's a bit better but it's still n/g. As was stated, you likely need a tech out to investigate. 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!