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Speed sudden drops to under 1Mbps, returns to normal if modem rebooted
I switched to a new Motorola SB6121 on 2/25.
About two weeks ago I started getting sudden drops in speed. It doesn't die completely, but is slow enough to be unusable. Rebooting the routers brings it back to normal, about 30Mbps.
Coax to the router is about two years old.
Here are my signal levels:
| Channel ID | 103 | 104 | 108 | |
| Frequency | 849000000 Hz | 855000000 Hz | 879000000 Hz | |
| Signal to Noise Ratio | 37 dB | 37 dB | 34 dB | |
| Downstream Modulation | QAM256 | QAM256 | QAM256 | |
Power Level
|
-2 dBmV | -2 dBmV | -4 dBmV |
| Upstream | Bonding Channel Value | ||
|---|---|---|---|
| Channel ID | 2 | 1 | 3 |
| Frequency | 29600000 Hz | 23300000 Hz | 36100000 Hz |
| Ranging Service ID | 267 | 267 | 267 |
| Symbol Rate | 5.120 Msym/sec | 2.560 Msym/sec | 5.120 Msym/sec |
| Power Level | 51 dBmV | 51 dBmV | 51 dBmV |
| Upstream Modulation | [3] QPSK [3] 64QAM |
[3] QPSK [2] 16QAM [3] 64QAM |
[3] QPSK [3] 64QAM |
| Ranging Status | Success | Success | Success |
| Signal Stats (Codewords) | Bonding Channel Value | ||
|---|---|---|---|
| Channel ID | 103 | 104 | 108 |
| Total Unerrored Codewords | 38370179 | 37459677 | 36553414 |
| Total Correctable Codewords | 20 | 0 | 872747 |
| Total Uncorrectable Codewords | 1454 | 475 | 34552 |
here is the modem's log right before and after reboot:
| Mar 31 2014 13:55:44 | 5-Warning | T07.0 | RCS Partial Service;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:55:43 | 6-Notice | I401.0 | TLV-11 - unrecognized OID;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:55:43 | 5-Warning | Z00.0 | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Jan 01 1970 00:00:31 | 5-Warning | D04.1 | ToD request sent - No Response received;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Jan 01 1970 00:00:19 | 3-Critical | R02.0 | No Ranging Response received - T3 time-out;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Jan 01 1970 00:00:13 | 6-Notice | N/A | Cable Modem Reboot from GUI/Configuration page ;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:45:46 | 6-Notice | N/A | MDD Recovery following MDD Loss;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:45:41 | 5-Warning | T202.0 | Lost MDD Timeout;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:45:41 | 5-Warning | N/A | DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:45:02 | 6-Notice | N/A | MDD Recovery following MDD Loss;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:44:51 | 5-Warning | T202.0 | Lost MDD Timeout;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:44:51 | 5-Warning | N/A | DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:44:00 | 6-Notice | N/A | MDD Recovery following MDD Loss;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:43:55 | 5-Warning | T202.0 | Lost MDD Timeout;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
| Mar 31 2014 13:43:55 | 5-Warning | N/A | DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=7c:bf:b1:d7:f9:ff;CMTS-MAC=00:1e:be:ff:07:79;CM-QOS=1.1;CM-VER=3.0; |
Anything stand out as being wrong? Thanks.
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ChrisL
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wingnutx2
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I got rid of the splitter right at the beginning of the run. This brings downstream signal strength to 1 dBmV , and upstream to 47, but doesn't do anything else.
I still get high speed for several hours, then it drop to under 5 then finally to under 1, then Cox can't even ping my modem.
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EdwardH
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wingnutx2
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Tech came and bypassed the NID and now all is well. I don't have a phone line anymore, so it was unnecessary anyway.
SNR and speed are way up, errors are way down. Definitely looks like that was the problem.
I did eliminate the splitter right after the NID and terminate unused drops before this, and got marginally better power and noise stats, but still got the periodic failures with no real pattern.
Anyway, good to go. Tech was great. Thanks.
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ChrisL
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