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Osirus's avatar
Osirus
Aspirant
Oct 08, 2020

CM700 Downstream Light blinking

Purchased a new CM700 and activated (via online) with Comcast.  Before I had Arris SB6580 and had download speed of >150 mpbs, now I am getting <90 mpbs with blinking download stream light.

Here is a copy of the error logs.  Can someone tell me how to fix this blinking downstream light and the errors seeing on the error log?

 

Thanks!

 

Oct 08 2020 02:53:54Error (4)RCS Primary DS Failure
Oct 08 2020 02:54:11Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:54:23Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:54:26Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:54:26Error (4)RCS Primary DS Failure
Oct 08 2020 02:54:41Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:54:53Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:54:56Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:54:56Error (4)RCS Primary DS Failure
Oct 08 2020 02:55:14Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:55:27Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:55:30Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:55:30Error (4)RCS Primary DS Failure
Oct 08 2020 02:55:46Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:55:59Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:56:02Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:56:02Error (4)RCS Primary DS Failure
Oct 08 2020 02:56:19Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:56:35Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:56:38Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:56:38Error (4)RCS Primary DS Failure
Oct 08 2020 02:56:54Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:57:16Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:57:19Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:57:19Error (4)RCS Primary DS Failure
Oct 08 2020 02:57:34Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:57:47Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:57:50Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:57:50Error (4)RCS Primary DS Failure
Oct 08 2020 02:58:07Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:58:29Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:58:32Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:58:32Error (4)RCS Primary DS Failure
Oct 08 2020 02:58:49Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:59:05Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:59:08Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:59:08Error (4)RCS Primary DS Failure
Oct 08 2020 02:59:25Critical (3)No Ranging Response received - T3 time-out
Oct 08 2020 02:59:41Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:59:44Warning (5)RCS Partial Service

13 Replies

  • plemans's avatar
    plemans
    Guru - Experienced User

    Do you also have a screen snip of the cable connections page? 

    If you have any splitters, amplifiers, or attenuators in line, I'd remove them. These can sometimes cause issues. 

    Check the line for kinks, damage, cheap/bad connectors, loose connectors. Preferablly, move the modem to right where the coax enters the home to prevent wiring in the home from being the issue. 

    • Osirus's avatar
      Osirus
      Aspirant

      I am not sure what you mean by a "screen snip of the cable connections page."  

       

      With regards to other devices, I do not have any splitters, amplifiers, or attenuators.

      I will try to replace the coaxial cable and see if that helps.

       

      Thanks for your suggestions.

      • Osirus's avatar
        Osirus
        Aspirant

        If you mean this...

         
         
        Apply             Cancel    
        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

        <tabindex=-1>Startup Procedure</tabindex=-1>

        ProcedureStatusComment
        Acquire Downstream Channel663000000 HzLocked
        Connectivity StateOkOperational
        Boot StateOkOperational
        SecurityEnabledBPI+
        IP Provisioning ModeHonor MDDhonorMdd(4)

        Downstream Bonded Channels (Partial Service)

        ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables
        1LockedQAM 25626555000000 Hz-17.3 dBmV30.0 dB227694095169734
        2LockedQAM 25627561000000 Hz-10.7 dBmV33.4 dB53122128
        3LockedQAM 25628567000000 Hz-8.5 dBmV35.0 dB180
        4LockedQAM 25629573000000 Hz-7.7 dBmV30.5 dB262870
        5LockedQAM 25630579000000 Hz-7.5 dBmV31.6 dB35410
        6LockedQAM 25631585000000 Hz-7.0 dBmV27.8 dB532274374307073
        7LockedQAM 25632591000000 Hz-7.2 dBmV31.9 dB351
        8LockedQAM 25633597000000 Hz-7.0 dBmV33.0 dB320
        9LockedQAM 25634603000000 Hz-6.4 dBmV33.4 dB110
        10LockedQAM 25635609000000 Hz-6.4 dBmV34.9 dB61
        11LockedQAM 25636615000000 Hz-6.4 dBmV34.9 dB300
        12LockedQAM 25637621000000 Hz-5.7 dBmV34.9 dB80
        13LockedQAM 25638627000000 Hz-6.0 dBmV35.0 dB210
        14LockedQAM 25639633000000 Hz-5.7 dBmV35.1 dB60
        15LockedQAM 25640639000000 Hz-6.2 dBmV34.9 dB30
        16LockedQAM 25641645000000 Hz-6.0 dBmV34.9 dB50
        17LockedQAM 25642651000000 Hz-6.2 dBmV34.5 dB350
        18LockedQAM 25643657000000 Hz-6.2 dBmV34.9 dB00
        19LockedQAM 25644663000000 Hz-6.4 dBmV34.4 dB20
        20LockedQAM 25645669000000 Hz-6.2 dBmV34.8 dB20
        21LockedQAM 25646675000000 Hz-6.2 dBmV34.8 dB60
        22LockedQAM 25647681000000 Hz-5.7 dBmV34.8 dB110
        23Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        24Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        25Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        26Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        27Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        28Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        29Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        30Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        31Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
        32Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00

        Upstream Bonded Channels

        ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
        1LockedATDMA15120 Ksym/sec16400000 Hz43.5 dBmV
        2LockedATDMA25120 Ksym/sec22800000 Hz44.3 dBmV
        3LockedATDMA35120 Ksym/sec29200000 Hz44.8 dBmV
        4LockedATDMA45120 Ksym/sec35600000 Hz45.0 dBmV
        5LockedATDMA51280 Ksym/sec39600000 Hz42.3 dBmV
        6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
        7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
        8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV