Valued Participant

Loss of Connectivity Requiring Cable Modem Reboot


I don't know if others have been experiencing this, but I am having periodic loss of connectivity that requires me to reboot my cable modem once every couple of weeks.

I have been with TWC/Spectrum for a few years and this problem just started occuring about 

2 months ago.


I have the 300MB/s service and have my own cable modem (Netgear CM600) and Netgear WiFI router  (R7800).

Todays Error Log from CM600

2018-10-02, 12:58:22Error (4)Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=dc:ef:09:22:48:d8;CMTS-MAC=00:17:10:88:2d:95;CM-QOS=1.1;CM-VER=3.0;
2018-10-02, 12:58:22Error (4)Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=dc:ef:09:22:48:d8;CMTS-MAC=00:17:10:88:2d:95;CM-QOS=1.1;CM-VER=3.0;
2018-10-02, 12:56:30Critical (3)No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=dc:ef:09:22:48:d8;CMTS-MAC=00:17:10:88:2d:95;CM-QOS=1.0;CM-VER=3.0;
2018-10-02, 12:53:32Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=dc:ef:09:22:48:d8;CMTS-MAC=00:17:10:88:2d:95;CM-QOS=1.1;CM-VER=3.0;
2018-10-02, 12:52:59Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=dc:ef:09:22:48:d8;CMTS-MAC=00:17:10:88:2d:95;CM-QOS=1.1;CM-VER=3.0


Do the channel Freqs and Signal Look good? Shoud there be more upstream channels?


Startup Procedure
Acquire Downstream Channel375000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
IP Provisioning ModeOverride MDDIPv6 only
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25617375000000 Hz5.8 dBmV39.2 dB732
2LockedQAM2562285000000 Hz5.6 dBmV39.2 dB00
3LockedQAM2563291000000 Hz5.6 dBmV39.2 dB00
4LockedQAM2564297000000 Hz5.9 dBmV39.4 dB00
5LockedQAM2565303000000 Hz5.8 dBmV39.4 dB00
6LockedQAM2566309000000 Hz5.8 dBmV39.4 dB00
7LockedQAM2567315000000 Hz5.8 dBmV39.3 dB00
8LockedQAM2568321000000 Hz6.2 dBmV39.5 dB00
9LockedQAM2569327000000 Hz6.2 dBmV39.4 dB00
10LockedQAM25610333000000 Hz6.3 dBmV39.4 dB00
11LockedQAM25611339000000 Hz6.5 dBmV39.5 dB00
12LockedQAM25612345000000 Hz6.4 dBmV39.5 dB00
13LockedQAM25613351000000 Hz6.1 dBmV39.4 dB00
14LockedQAM25614357000000 Hz5.9 dBmV39.3 dB00
15LockedQAM25615363000000 Hz6.2 dBmV39.4 dB00
16LockedQAM25616369000000 Hz6.1 dBmV39.4 dB00
17LockedQAM2561279000000 Hz5.0 dBmV39.0 dB00
18LockedQAM25618381000000 Hz4.9 dBmV39.2 dB00
19LockedQAM25619387000000 Hz5.0 dBmV39.3 dB00
20LockedQAM25620393000000 Hz5.0 dBmV39.2 dB00
21LockedQAM25621399000000 Hz5.2 dBmV39.0 dB00
22LockedQAM25622405000000 Hz5.1 dBmV38.9 dB00
23LockedQAM25623411000000 Hz4.9 dBmV39.0 dB00
24LockedQAM25624417000000 Hz4.8 dBmV39.0 dB00
<Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec24200000 Hz45.5 dBmV
2LockedTDMA12560 Ksym/sec19400000 Hz45.5 dBmV
3LockedATDMA35120 Ksym/sec30600000 Hz46.8 dBmV
4LockedATDMA45120 Ksym/sec37000000 Hz47.0 dBmV
5Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
Lead Moderator

Re: Loss of Connectivity Requiring Cable Modem Reboot

Good afternoon.


Sorry to hear you are having problems recently.


Some information you can post to help your peers diagnose the issue can 




Julia R.
Spectrum-Social Media Customer Care
Lead Moderator-Community Forums