I'm turning to the forums because I have had zero help with the techs. On two occasions they have supposedly checked the outside lines, and I'm getting the runaround on an inside visit schedule. Enough on that though...
SB6121 modem is about 7 months old. Has worked great until about 12 days ago when it started dropping and reconnecting intermittently. It's gotten much worse, happening dozens of times a day. Got so bad I bought another 6121 yesterday and it worked fine for about 5hrs then started the same issue.
Some log messages:
Time Priority Code Message Jun 20 2014 07:59:28 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:26 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:26 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:26 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:25 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:25 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:59:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:46:53 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:55 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:25 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:25 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:25 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:25 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 07:45:24 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jun 20 2014 05:24:47 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:01:5c:31:bf:c7;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=3c:36:e4:a4:fc:07;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Modem vitals look good?
Downstream
Signal to Noise Ratio36 dB 36 dB 36 dB 36 dB
Modulation QAM256 QAM256 QAM256 QAM256
Power Level-3 dBmV -3 dBmV -3 dBmV -3 dBmV
Upstream
Frequency 27900000 Hz 34800000 Hz 21000000 Hz
Ranging Service ID 11274 11274 11274 Symbol Rate 5.120 Msym/sec 5.120 Msym/sec 5.120 Msym/sec
Power Level 39 dBmV 39 dBmV 38 dBmV
Upstream Modulation [3] QPSK
Please any ideas? Nothing has changed w my inside wiring etc. There is only one splitter in the attic and a tech was out about two months ago and supposedly checked everything out ok.
Thanks!
UPDATE: Since the original post a few minutes ago, the connections have dropped another three times/