I just got xfinity internet last week, and although my speeds are normally good, my Motorola SBG6580 gateway occasionally disconnects for a short time a couple of times a day. The gateway is brand new. It happens most often at night from 10-12, but it also occurs at other times. Immediately after it reconnects, the internet is fast again (traceroute and ping to google.com show no problems, with ping times of 15-30ms, speedtest.net gives speeds of ~14 Mbps down, ~1.7 Mbps up).
The "TLV-11 - unrecognized OID" error is the most common error I see when it disconnects (I only had the time out error occur once so far). For some reason, these errors disappear from the log over time - only one is shown below, but I've had at least one a day. The gateway time is also an hour behind local time (maybe this and the log problem indicate some kind of problem with the gateway itself?).
Software information:
Standard Specification Compliant DOCSIS 3.0
Hardware Version 1
Software Version SBG6580-3.1.0.0-GA-07-180-NOSH
Cable Modem MAC Address 1c:14:48:b1:75:66
Cable Modem Serial Number 324369119215027359530006
CM certificate Installed
Connection information (taken right after it reconnected from the latest DC):
Procedure - Status - Comment
Acquire Downstream Channel - (blank) - Locked
Connectivity State - OK - Operational
Boot State - OK - Operational
Configuration File - (blank) - (blank)
Security - Enabled - BPI+
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR
1 Locked QAM256 1 705000000 Hz 1.2 dBmV 36.8 dB
2 Locked QAM256 2 711000000 Hz 1.0 dBmV 36.7 dB
3 Locked QAM256 3 717000000 Hz 0.2 dBmV 36.2 dB
4 Locked QAM256 4 723000000 Hz -0.6 dBmV 36.1 dB
5 Locked QAM256 5 729000000 Hz -2.1 dBmV 35.4 dB
6 Locked QAM256 6 735000000 Hz -3.5 dBmV 34.9 dB
7 Locked QAM256 7 741000000 Hz -5.1 dBmV 34.5 dB
8 Locked QAM256 8 747000000 Hz -6.0 dBmV 33.4 dB
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 9 5120 Ksym/sec 37000000 Hz 44.7 dBmV
2 Locked ATDMA 7 5120 Ksym/sec 25300000 Hz 44.7 dBmV
3 Locked TDMA 8 5120 Ksym/sec 30600000 Hz 44.7 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Event log (Oct 19 was my install time, the 6 time not established errors are from the install as well I think):
Fri Oct 28 15:40:16 2011 Notice (6) TLV-11 - unrecognized OID;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Thu Oct 27 09:46:12 2011 Critical (3) No Ranging Response received - T3 time-out
Thu Oct 27 09:45:51 2011 Critical (3) No Ranging Response received - T3 time-out
Thu Oct 27 09:45:49 2011 Critical (3) No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.0;CM-VER=3.0;
Thu Oct 27 09:45:39 2011 Critical (3) No Ranging Response received - T3 time-out
Thu Oct 27 09:45:17 2011 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Thu Oct 27 09:44:44 2011 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Thu Oct 27 09:40:49 2011 Critical (3) No Ranging Response received - T3 time-out
Thu Oct 27 09:40:31 2011 Critical (3) No Ranging Response received - T3 time-out
Thu Oct 27 09:40:21 2011 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Thu Oct 27 09:39:48 2011 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Tue Oct 25 03:58:21 2011 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.1;CM-VER=3.0;
Wed Oct 19 08:36:28 2011 Critical (3) Resetting the cable modem due to docsDevResetNow Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:01:5c:33:16:82;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=1c:14:48:b1:75:66;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
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