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vegas50000

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Poor downstream power levels leading to loss of signal

So I had a technician come out this past Thursday for an issue with low downstream power levels leading to outages.  The morning of the visit my power levels were all of a sudden -1 and 0 dBmv, so the technician came, did nothing, and left.  Tinfoil hat conspiracy?  Maybe...

  Afterward, I hooked up my new SB6183 modem (since the modem was a possibility I needed to rule out) and watched the signal stats throughout the day.  They dropped back down to weak levels leading to another 20 minute outage this morning.

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 97 813000000 Hz -6.5 dBmV 39.5 dB 144 228
2 Locked QAM256 98 819000000 Hz -6.5 dBmV 39.5 dB 150 198
3 Locked QAM256 99 825000000 Hz -6.3 dBmV 39.7 dB 151 208
4 Locked QAM256 100 831000000 Hz -6.5 dBmV 39.6 dB 144 222
5 Locked QAM256 101 837000000 Hz -6.5 dBmV 39.7 dB 166 220
6 Locked QAM256 102 843000000 Hz -6.3 dBmV 39.8 dB 4619 6856
7 Locked QAM256 103 849000000 Hz -6.4 dBmV 39.9 dB 162 201
8 Locked QAM256 104 855000000 Hz -6.4 dBmV 40.0 dB 125 215
9 Locked QAM256 113 909000000 Hz -7.6 dBmV 40.1 dB 142 216
10 Locked QAM256 114 915000000 Hz -7.8 dBmV 40.0 dB 305 534
11 Locked QAM256 115 921000000 Hz -7.7 dBmV 40.0 dB 194 566
12 Locked QAM256 116 927000000 Hz -8.0 dBmV 39.8 dB 204 537
13 Locked QAM256 117 933000000 Hz -8.2 dBmV 39.8 dB 157 216
14 Locked QAM256 118 939000000 Hz -8.4 dBmV 39.7 dB 297 515
15 Locked QAM256 119 945000000 Hz -8.7 dBmV 39.5 dB 144 222
16 Locked QAM256 120 951000000 Hz -9.2 dBmV 39.1 dB 398 565

Here's the log from the 20 minute outage:

TimePriorityDescription
Sun Apr 05 08:57:40 2015 Warning (5) MDD message timeout;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.1;CM-VER=3.0;
Sun Apr 05 08:57:37 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.1;CM-VER=3.0;
Sun Apr 05 08:37:43 2015 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.1;CM-VER=3.0;

Since my SNR and upstream power levels are excellent, I don't think this is a line issue.  I think it's Cox not supplying enough power.  Does anyone know the secret phrase to get them to turn up the juice?  I don't have the time or money to keep shelling out $60 for a technician "consultation".

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vegas50000

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Here's the log from the latest 15 minute outage.  Note that it was unable to get a signal from Cox - but upstream and SNR values are good.

Event Log

The table below contains the log of events that the SB6183 has detected. This log can be important to the service provider to help diagnose and correct problems, if any should occur.

TimePriorityDescription
Sun Apr 05 22:38:17 2015 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.1;CM-VER=3.0;
Sun Apr 05 22:37:35 2015 Notice (6) TLV-11 - unrecognized OID;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.1;CM-VER=3.0;
Sun Apr 05 22:37:33 2015 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:37:31 2015 Notice (6) Honoring MDD; IP provisioning mode = IPv4
Sun Apr 05 22:37:19 2015 Notice (6) Dhcp Init Failed - Reinitialize MAC...
Sun Apr 05 22:37:15 2015 Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:35:09 2015 Notice (6) Honoring MDD; IP provisioning mode = IPv4
Sun Apr 05 22:34:56 2015 Notice (6) Tftp Init Failed - Reinitialize MAC...
Sun Apr 05 22:34:56 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:34:56 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:34:25 2015 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:34:22 2015 Notice (6) Honoring MDD; IP provisioning mode = IPv4
Sun Apr 05 22:34:10 2015 Notice (6) Tftp Init Failed - Reinitialize MAC...
Sun Apr 05 22:34:10 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:34:10 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:33:39 2015 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:33:36 2015 Notice (6) Honoring MDD; IP provisioning mode = IPv4
Sun Apr 05 22:33:24 2015 Notice (6) Tftp Init Failed - Reinitialize MAC...
Sun Apr 05 22:33:24 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:33:24 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:32:52 2015 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:32:50 2015 Notice (6) Honoring MDD; IP provisioning mode = IPv4
Sun Apr 05 22:32:39 2015 Notice (6) Tftp Init Failed - Reinitialize MAC...
Sun Apr 05 22:32:39 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:32:39 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv4
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:28:49 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:28:49 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:28:03 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:28:03 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;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=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:26:08 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:26:06 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:26:06 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:21 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:19 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:15 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:13 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:12 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:11 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:06 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:05 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:04 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:03 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:02 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:25:01 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:24:59 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:24:42 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:24:42 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:23:56 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:23:29 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:23:29 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:22:44 2015 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:22:42 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:22:42 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:21:56 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:21:56 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:21:10 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:21:10 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:20:25 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:20:25 2015 Critical (3) TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;
Sun Apr 05 22:19:40 2015 Critical (3) TFTP Request Retries exceeded, CM unable to register
Sun Apr 05 22:19:40 2015 Critical (3)

TFTP failed - Request sent - No Response;CM-MAC=6c:ca:08:71:9c:b7;CMTS-MAC=70:ca:9b:a7:92:a0;CM-QOS=1.0;CM-VER=3.0;

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 102 843000000 Hz -6.0 dBmV 39.9 dB 0 0
2 Locked QAM256 97 813000000 Hz -6.2 dBmV 39.6 dB 0 0
3 Locked QAM256 98 819000000 Hz -6.2 dBmV 39.7 dB 0 0
4 Locked QAM256 99 825000000 Hz -5.9 dBmV 39.8 dB 0 0
5 Locked QAM256 100 831000000 Hz -6.2 dBmV 39.8 dB 0 0
6 Locked QAM256 101 837000000 Hz -6.1 dBmV 39.9 dB 0 0
7 Locked QAM256 103 849000000 Hz -6.1 dBmV 40.0 dB 0 0
8 Locked QAM256 104 855000000 Hz -6.1 dBmV 40.1 dB 0 0
9 Locked QAM256 113 909000000 Hz -7.2 dBmV 40.2 dB 0 0
10 Locked QAM256 114 915000000 Hz -7.4 dBmV 40.1 dB 0 0
11 Locked QAM256 115 921000000 Hz -7.3 dBmV 40.1 dB 0 0
12 Locked QAM256 116 927000000 Hz -7.6 dBmV 40.0 dB 0 0
13 Locked QAM256 117 933000000 Hz -7.7 dBmV 40.0 dB 0 0
14 Locked QAM256 118 939000000 Hz -8.0 dBmV 39.8 dB 0 0
15 Locked QAM256 119 945000000 Hz -8.3 dBmV 39.7 dB 0 0
16 Locked QAM256 120 951000000 Hz -8.9 dBmV 39.3 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 23300000 Hz 38.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 36300000 Hz 38.3 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29800000 Hz 38.3 dBmV
4 Locked ATDMA 4 2560 Ksym/sec 18400000 Hz 38.3 dBmV

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DerrickW

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Thank you for providing the information from your modem log.  I  checked the modem history on our end as well and there appears to have been a fluctuation in the signal.  I noticed a slight increase on the T3 timeouts and the uncorrectable errors.  Are there any splitters connected inside of the home? 

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