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Scott_UU's avatar
Scott_UU
Star
Mar 28, 2019
Solved

CM1150V Upstream Channel Problem with Xfinity

I purchased a CM1150V to replace an Xfinity (Arris) XB6.   The XB6 had been in place, running in bridge mode, for 2 months.  It showed (4) upstream channels with good power levels, (31+OFDM) downstre...
  • Scott_UU's avatar
    Scott_UU
    Apr 03, 2019

    An Xfinity tech was out today.  He found a noise block filter at the pole.  No idea when or why it was installed.  That was blocking the two lower frequency channels.

     

    A noise block filter had previously been ruled out, because the Xfinity-supplied Arris XB6 was reporting all (4) channels locked.  So I now question the veracity of the Arris XB6 status page.  All other modems tested (CM1150V, Arris TM722G, Arris SBV3202) were unable to lock the channels with that filter in place.   So I don't think the Arris XB6 was actually locking those channels either, even though it said it was.

     

    Once the tech removed the noise block filter at the pole, the CM1150V immediately locked all (4) channels.  The constant T3/T4 errors are gone as well.  No problems with the CM1150V, the upstream issue was all from a previous Xfinity/Comcast tech installing that noise block filter at the tap.

     

    Thanks to vkdelta for help and supporting information, which helped me explain/prove the problem to Xfinity so they would come fix it!

     

FunBucks's avatar
FunBucks
Aspirant
Apr 04, 2019

Not sure if this is related to this post, or if I need to start a new one.

 

Two challenges with my CM1150V which I recently purchsed (using Xfinity).

 

The upstream light is always flashing green.  Never solid green like all other lights.

 

Also, my router is plugged into Ethernet Port 1.  Works.

 

When I plug anything else (ie PC) into ethernet ports 2,3,4 nothing happens.  I should just get direct hardwired internet to my PC? Correct?

 

So why do the other 3 ethernet ports not work.

 

Please advise.

Scott_UU's avatar
Scott_UU
Star
Apr 04, 2019
FunBucks wrote:

The upstream light is always flashing green.  Never solid green like all other lights.

I am curious about this as well.  When I was only getting 2 of the 4 upstream channels, the GUI said "(partial service)" above the channel list AND the upstream light was flashing to indicate "partial service".   Now that I'm getting all 4 upstream channels, the "(partial service)" text is gone from the GUI -- but the upstream light is still flashing.   Have rebooted and factory reset, but the LED is still flashing.  Hopefully someone from Netgear can answer that for both of us.

 

FunBucks wrote:

Also, my router is plugged into Ethernet Port 1.  Works.  When I plug anything else (ie PC) into ethernet ports 2,3,4 nothing happens.  I should just get direct hardwired internet to my PC? Correct?  So why do the other 3 ethernet ports not work.

The CM1150V is a modem, not a gateway or router, so it has no routing capability.  You'll need to connect your router to the modem, and your other devices to the router.  The additional ethernet ports are for the "port aggregation" feature, which allows (if you have latest firmware, a plan with sufficient speed to need it, and a modem that supports it) a multi-gigabyte connection between the modem and the router. 

 

 

 

 

 

  • vkdelta's avatar
    vkdelta
    NETGEAR Employee Retired
    Apr 04, 2019

    customer>>

    The upstream light is always flashing green.  Never solid green like all other lights. -

     

    response>>

    This is because of partial service on upstream. if you fix the coax/line/plant issues and all 4 upstreams are locked. 

     

    customer>>

    Also, my router is plugged into Ethernet Port 1.  Works.

    When I plug anything else (ie PC) into ethernet ports 2,3,4 nothing happens.  I should just get direct hardwired internet to my PC? Correct?

    So why do the other 3 ethernet ports not work. 

     

    response>>

    Port 2,3,4 will only work if you have Multiple IP service package for different IPs. Some ISPs offer it, not all though.

    Port 1,2 will work together if you enable LAG and have LAG-capable router.

     

    • vkdelta's avatar
      vkdelta
      NETGEAR Employee Retired
      Apr 04, 2019

      response>>

      This is because of partial service on upstream. if you fix the coax/line/plant issues and all 4 upstreams are locked then LED will be solid. 

      • Scott_UU's avatar
        Scott_UU
        Star
        Apr 04, 2019
        vkdelta wrote:

        response>>

        This is because of partial service on upstream. if you fix the coax/line/plant issues and all 4 upstreams are locked then LED will be solid. 

        But my upstream problem IS fixed...  Channel status now shows all provisioned channels locked, and the "partial service" text is gone from the GUI.   BUT THE LIGHT IS STILL FLASHING.   Have tried power cycle and factory reset, US light still flashes.   ????

        Downstream Bonded Channels
        Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
        1 Locked QAM256 29 663000000 Hz -2.4 dBmV 38.8 dB 0 0
        2 Locked QAM256 1 483000000 Hz -1.5 dBmV 39.8 dB 0 0
        3 Locked QAM256 2 489000000 Hz -1.4 dBmV 39.8 dB 0 0
        4 Locked QAM256 3 495000000 Hz -1.4 dBmV 39.8 dB 0 0
        5 Locked QAM256 4 507000000 Hz -1.6 dBmV 39.7 dB 0 0
        6 Locked QAM256 5 513000000 Hz -1.8 dBmV 39.7 dB 0 0
        7 Locked QAM256 6 519000000 Hz -1.7 dBmV 39.8 dB 0 0
        8 Locked QAM256 7 525000000 Hz -1.7 dBmV 39.8 dB 0 0
        9 Locked QAM256 8 531000000 Hz -1.8 dBmV 39.7 dB 0 0
        10 Locked QAM256 9 543000000 Hz -2 dBmV 39.6 dB 0 0
        11 Locked QAM256 10 549000000 Hz -1.9 dBmV 39.6 dB 0 0
        12 Locked QAM256 11 555000000 Hz -1.9 dBmV 39.5 dB 0 0
        13 Locked QAM256 12 561000000 Hz -1.7 dBmV 39.6 dB 0 0
        14 Locked QAM256 13 567000000 Hz -1.8 dBmV 39.6 dB 0 0
        15 Locked QAM256 14 573000000 Hz -1.9 dBmV 39.6 dB 0 0
        16 Locked QAM256 15 579000000 Hz -1.9 dBmV 39.5 dB 0 0
        17 Locked QAM256 16 585000000 Hz -2 dBmV 39.5 dB 0 0
        18 Locked QAM256 17 591000000 Hz -1.9 dBmV 39.5 dB 0 0
        19 Locked QAM256 18 597000000 Hz -2 dBmV 39.4 dB 0 0
        20 Locked QAM256 19 603000000 Hz -2.1 dBmV 39.3 dB 0 0
        21 Locked QAM256 20 609000000 Hz -2.3 dBmV 39.3 dB 0 0
        22 Locked QAM256 21 615000000 Hz -2.4 dBmV 39.2 dB 0 0
        23 Locked QAM256 22 621000000 Hz -2.4 dBmV 39.1 dB 0 0
        24 Locked QAM256 23 627000000 Hz -2.4 dBmV 39.1 dB 0 0
        25 Locked QAM256 24 633000000 Hz -2.3 dBmV 39 dB 0 0
        26 Locked QAM256 25 639000000 Hz -2.5 dBmV 38.9 dB 0 0
        27 Locked QAM256 26 645000000 Hz -2.6 dBmV 38.8 dB 0 0
        28 Locked QAM256 27 651000000 Hz -2.5 dBmV 38.7 dB 0 0
        29 Locked QAM256 28 657000000 Hz -2.6 dBmV 38.8 dB 0 0
        30 Locked QAM256 30 669000000 Hz -2.6 dBmV 38.7 dB 0 0
        31 Locked QAM256 31 675000000 Hz -2.7 dBmV 37.9 dB 0 0
        32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
         
        Upstream Bonded Channels
        Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
        1 Locked ATDMA 5 5120 Ksym/sec 30100000 Hz 39.3 dBmV
        2 Locked ATDMA 6 5120 Ksym/sec 36500000 Hz 39.8 dBmV
        3 Locked ATDMA 7 5120 Ksym/sec 17300000 Hz 37.3 dBmV
        4 Locked ATDMA 8 5120 Ksym/sec 23700000 Hz 38.3 dBmV
        5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
        6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
        7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
        8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
         
        Downstream OFDM Channels
        Channel Lock 
        Status        		 Modulation / 
        Profile ID        		 Channel 
        ID        		 Frequency Power SNR / 
        MER        		 Active Subcarrier 
        Number Range        		 Unerrored 
        Codewords        		 Correctable 
        Codewords        		 Uncorrectable 
        Codewords
        1 Locked 0 159 722000000 Hz -2.6 dBmV 38.0 dB 1126 ~ 2969 388467542 1 0
        2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0
         
        Upstream OFDMA Channels
        Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
        1 Not Locked 0 0 0 Hz 0 dBmV
        2 Not Locked 0 0 0 Hz 0 dBmV