NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.

Forum Discussion

tcq's avatar
tcq
Aspirant
Oct 12, 2017
Solved

Modem CM500: many channels not locked; slow connection (1-2mbps)

See below. Is it normal for many channels not locked? The Internet starts fast, but over one hour or so drops to crawl speed (1mpbs or less). A reboot of the modem often fixes the problem, but it will gets slow again over time. Is this a cable problem or modem problem? Any advice is appreciated!

 

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel519000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)
 
Downstream Bonded Channels (Partial Service)
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2562519000000 Hz0.2 dBmV40.3 dB00
2LockedQAM2563525000000 Hz-0.4 dBmV34.7 dB00
3LockedQAM2564531000000 Hz-0.7 dBmV38.2 dB00
4LockedQAM2565537000000 Hz-1.6 dBmV39.5 dB00
5LockedQAM2566543000000 Hz-2 dBmV39.6 dB00
6Not LockedUnknown7549000000 Hz0.0 dBmV0.0 dB00
7Not LockedUnknown8555000000 Hz0.0 dBmV0.0 dB00
8Not LockedUnknown9561000000 Hz0.0 dBmV0.0 dB00
9Not LockedUnknown10567000000 Hz0.0 dBmV0.0 dB00
10Not LockedUnknown11573000000 Hz0.0 dBmV0.0 dB00
11LockedQAM25612579000000 Hz-10.5 dBmV32.8 dB940
12Not LockedUnknown27687000000 Hz0.0 dBmV0.0 dB00
13Not LockedUnknown29699000000 Hz0.0 dBmV0.0 dB00
14LockedQAM25630705000000 Hz1 dBmV39.9 dB00
15LockedQAM25631717000000 Hz1.7 dBmV39.8 dB00
16LockedQAM25632723000000 Hz1.4 dBmV39.5 dB00
 
Upstream Bonded Channels (Partial Service)
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA735120 Ksym/sec17300000 Hz46.8 dBmV
2LockedATDMA745120 Ksym/sec23700000 Hz46.8 dBmV
3LockedATDMA755120 Ksym/sec30300000 Hz50.3 dBmV
4Not LockedUnknown760 Ksym/sec36700000 Hz0.0 dBmV
 
Troubleshooting
  • vkdelta's avatar
    vkdelta
    Oct 13, 2017

    you have a serious noise issue either in home wiring or ISP's line. that is why most your downstream channels are NOT locked. and whatever is locked have lot of uncorrectable errors. 

     

    what modem did you have before CM500? did it have same problem? or you are moving into a new house/apartment?

9 Replies

  • vkdelta's avatar
    vkdelta
    NETGEAR Employee Retired
    Oct 12, 2017

    please post the screenshots of connection page, event logs and who is your ISP? 

    did you try with device directly connected to the modem?

    have you tried isolating your Router?

      • tcq's avatar
        tcq
        Aspirant
        Oct 12, 2017

        Event Log
               Clear Log                Refresh        
         
         
         
         
        TimePriorityDescription
        2017-10-11, 21:49:07Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:28Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:28Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:29Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:50Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:50Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:49:52Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:13Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:13Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:14Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:35Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:35Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:37Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:57Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:57Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:50:59Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:19Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:19Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:21Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:42Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:42Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:51:44Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:04Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:04Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:05Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:27Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:27Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:28Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:49Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:49Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:52:50Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:11Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:11Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:12Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:33Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:33Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:34Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:55Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:55Critical (3)16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
        2017-10-11, 21:53:57Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:fc:c9:48;CMTS-MAC=00:01:5c:63:e0:7b;CM-QOS=1.1;CM-VER=3.0;
         
        Help CenterShow/Hide Help Center