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flitzanu's avatar
flitzanu
New Contributor II
6 years ago

T4 errors / constant disconnects

anyone experiencing these, or getting constant disconnects over the past 6 months?

Motorola MB8600.

running a 5 second ping connection test, so far i have 23 disconnects in less than 24 hours.

there are no splitters, and one single connection from the line inside my house.

 Wed Apr 4 18:18:13 2018    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:24 2018    Notice (6)   Honoring MDD; IP provisioning mode = IPv4" 
 Wed Apr 4 18:18:27 2018    Warning (5)   DHCP WARNING - Non-critical field invalid in response ;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:27 2018    Notice (6)   TLV-11 - unrecognized OID;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:30 2018    Warning (5)   Dynamic Range Window violation" 

12 Replies

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  • Hello,

    Do you have any splitters or signal amps on the cable line going to the modem?

    Thanks,

    Allan - Cox Support Forums Moderator.

  • flitzanu's avatar
    flitzanu
    New Contributor II

    no.  this was a fresh install done in May 2016, only one line into the house, only connected to internet.  no tv services, no other services.  only one coax outlet.  when I upgraded to 300mb, a tech even redid some of the wiring outside to clean it up.

    and now for over 6 months i have constant disconnects.  

    for today, as of 4:16pm, and now 8:06pm, I have had 12 disconnects.

  • KreepLV's avatar
    KreepLV
    New Contributor

    You are NOT alone. I have experienced the same problems for over two years. I connected my old cable modem to see if that was it. Had problems with that and they told me the cable modem failed and they provisioned my new one incorrectly. I threw the old one away and reconnected it with the newer DOCSIS 3.0 one. The problems continued on and off the entire time I have been at my residence.

    We also have regular outages, which we are having another one for a 2nd day in a row right now. Terrible service in my area! I can't believe it, but I am actually considering DSL. I would rather have a lower speed stable connection than this high-speed intermittent connection. I mean, how much do you want to bet the same piece of local equipment is failing over and over again? You would think after the same area having outages so often, a senior tech would investigate why it is happening so often to try to come up with a long-term solution. It almost feels like they don't track that at all! 

    BTW: My logs are due to the outage. Otherwise, I normally get the T4 and IPV4 timeout issues as the original poster. The installer placed my splitter in a keyed box. I guess I'll have to look at that the next time I have issues. 

    Here are my logs:

    2018-4-6, 19:15:58 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:16:02 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:18:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:18:41 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:26 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:29 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:30 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:33 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
  • MarkM1's avatar
    MarkM1
    Former Moderator

    flitzanu,

    Would you try to a reset of your modem & bypass the router to see if you are still seeing the issue at the modem? We want to see if the issue is at the modem.

    • flitzanu's avatar
      flitzanu
      New Contributor II

      I've tried bypassing the router and still receive the same problems.

  • Hello KreepLV, We do see outages posted recently in your area. Modem also shows some concerns as well. If you would like to schedule and appointment to have a tech back out to the home. Please reach us on Twitter at @CoxHelp, visit us on Facebook, or email by at cox.help@cox.com. Provide us the name on the account with the full service address with a link to this thread so we can get started with setting up an appointment.
  • WiderMouthOpen's avatar
    WiderMouthOpen
    Esteemed Contributor

    Let me guess, underground wiring that goes through a green box on your lawn? If so, have that box and line from the box to your house checked. 9/10 that is where the problem is occurring. See any Cox trucks in the area?

  • Hello,

    We can certainly look into this issue for you. Please send us an email with your full address to cox.help@cox.com so we can help.

    Thanks,

    Allan - Cox Support Forums Moderator. 

    • flitzanu's avatar
      flitzanu
      New Contributor II

      i've sent an email with the information.

      also my disconnects from 4/7 to 4/29 was nearly 250 disconnects.

      and currently in 24 hours, i'm at 28 disconnects.

      • ColleenD's avatar
        ColleenD
        Moderator
        Flitzanu, I see JJ responded to your email. We can continue troubleshooting there if it is more convenient than here.
  • flitzanu's avatar
    flitzanu
    New Contributor II

    new update.  had a tech come out on wednesday, and Kyle was by far the most diligent tech to visit.  found water in the line from the pole to the house and rewired all of it, and spent the entire 2 hours working.  the others, well, they've all spent about 10 minutes before saying "yeah it's not working, we'll send someone out".

    also stated that there was still a main line issue that didn't seem to be fixed, and turned in a ticket for that, and someone would be by over the next few days to fix it (didn't need to be here).

    next day i found a note after work that one had been by and "checked it" and i couldn't read the writing, but sounded like nothing was done other than checking and saying "it's fine".

    everything has been A LOT better, though i must say, from 5/9 afternoon until 5/10 afternoon, i had 6 disconnects.  so now over the next few days i'll be seeing how intermittent or frequent the drops continue.