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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 wil...
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?

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

    ISP: comcast/xfinity.

    • 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;
       
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      • tcq's avatar
        tcq
        Aspirant
        Oct 12, 2017

        Cable Connection
         
         
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        Frequency start Value
        This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
        Starting Frequency
         
        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
        2LockedQAM2564531000000 Hz-0.8 dBmV39.9 dB10
        3LockedQAM2566543000000 Hz-2.2 dBmV39.6 dB10
        4Not LockedUnknown7549000000 Hz0.0 dBmV0.0 dB00
        5Not LockedUnknown9561000000 Hz0.0 dBmV0.0 dB00
        6LockedQAM25612579000000 Hz-10.6 dBmV33.9 dB390
        7Not LockedUnknown13585000000 Hz0.0 dBmV0.0 dB00
        8Not LockedUnknown14591000000 Hz0.0 dBmV0.0 dB00
        9Not LockedUnknown17609000000 Hz0.0 dBmV0.0 dB00
        10Not LockedUnknown21633000000 Hz0.0 dBmV0.0 dB00
        11Not LockedUnknown22639000000 Hz0.0 dBmV0.0 dB00
        12Not LockedUnknown23645000000 Hz0.0 dBmV0.0 dB00
        13LockedQAM25624651000000 Hz-3.5 dBmV29.9 dB341075919271
        14LockedQAM25630705000000 Hz1 dBmV39.9 dB20
        15LockedQAM25631717000000 Hz1.7 dBmV39.9 dB10
        16LockedQAM25632723000000 Hz1.2 dBmV39.7 dB10
         
        Upstream Bonded Channels (Partial Service)
        ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
        1LockedATDMA735120 Ksym/sec17300000 Hz47.8 dBmV
        2LockedATDMA745120 Ksym/sec23700000 Hz47.8 dBmV
        3LockedATDMA755120 Ksym/sec30300000 Hz51 dBmV
        4Not LockedUnknown760 Ksym/sec36700000 Hz0.0 dBmV
         
        Current System Time:Wed Oct 11 21:55:14 2017
         
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