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Only 1 bonded upstream channel, constant T3/T4 time-outs

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Only 1 bonded upstream channel, constant T3/T4 time-outs

Hi, I have an Arris SB6121 that has been showing just one upstream bonded channel, with T3 and T4 time-outs every minute or so in the log. Perhaps because of this, the status shows "Offline" even though the internet is usable.

 

It may have been this way for a while, but I only noticed since the connection became unstable lately, dropping out for hours every few weeks or so. No amount of restarting or resetting the modem works. Download, upload speeds and latency are good.

 

The modem is directly connected to the cable line from outside, with nothing but a ground block between the utility pole and the modem. No splitters, extenders, or filters.

 

Is there anything I can do to diagnose this further? Thanks all. 

 

Downstream Bonding Channel Value
Channel ID33 34 35 36 
Frequency651000000 Hz 657000000 Hz 663000000 Hz 669000000 Hz 
Signal to Noise Ratio38 dB 38 dB 38 dB 39 dB 
Downstream ModulationQAM256 QAM256 QAM256 QAM256 
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
6 dBmV  5 dBmV  5 dBmV  5 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency36500000 Hz 17300000 Hz 23700000 Hz 30100000 Hz 
Ranging Service ID2308 2308 2308 2308 
Symbol Rate5.120 Msym/sec 5.120 Msym/sec 5.120 Msym/sec 5.120 Msym/sec 
Power Level39 dBmV 39 dBmV 39 dBmV 39 dBmV 
Upstream Modulation[2] QPSK
[1] 32QAM
[3] 64QAM
 
[2] QPSK
[1] 32QAM
[3] 64QAM
 
[2] QPSK
[1] 32QAM
[3] 64QAM
 
[2] QPSK
[1] 32QAM
[3] 64QAM
 
Ranging StatusSuccess T4 TimeOut T4 TimeOut T4 TimeOut 

 

Signal Status (Codewords) Bonding Channel Value
Channel ID33 34 35 36 
Total Unerrored Codewords12130014434 12129120465 12129121859 12129121352 
Total Correctable Codewords124 103 122 99 
Total Uncorrectable Codewords1202 2173 1168 1277 

 

 

Time Priority Code Message
Sep 03 2020 16:02:463-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:02:163-CriticalR05.0Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:02:063-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:01:563-CriticalR05.0Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:01:363-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:01:363-CriticalR05.0Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;
Sep 03 2020 16:01:263-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=64:55:b1:b9:03:da;CMTS-MAC=70:6e:6d:2c:b0:ee;CM-QOS=1.1;CM-VER=3.0;