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Motorola MB8600 - Locking up, T3 Time Out Errors

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Motorola MB8600 - Locking up, T3 Time Out Errors

Hello,

 

Over the past month or so I've been having ongoing issues with my connection:

 

1. Every few days my modem "locks up" - lights are on, no visible activity (ex. unplug cable but light stays on) fixed with a restart

2. Dropped connections - no solid connection lights

3. Degraded performance - paying for 600mb but seeing less than 50mb at times

 

This has happened as recently as this morning. Modem event logs shows errors like No Ranging Response received - T3 time-out. 

 

I'm connected directly to my router, router to the wall, and the wall goes out of my appartmnet unit (3 story building with a few dozen units).

 

I spoke with Comcast support a few times and the only response I've gotten back is that 'everything looks good on our end' when they do a line test. 

Modem info below right now as everything apperas to be working. Thanks for any help with this one.

 

Motorola MB8600
Startup Step

  Startup Step Status Comment
  Acquire Downstream Channel 501000000 Hz Locked
  Upstream Connection OK Operational
  Boot State OK Operational
   Configuration File OK  
   Security Enabled BPI+

 

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 5 501.0 1.9 41.5 0 0
   2 Locked QAM256 1 477.0 2.3 41.6 0 0
   3 Locked QAM256 2 483.0 2.2 41.6 0 0
   4 Locked QAM256 3 489.0 2.0 41.4 0 0
   5 Locked QAM256 4 495.0 2.0 41.5 0 0
   6 Locked QAM256 6 507.0 2.0 41.5 0 0
   7 Locked QAM256 7 513.0 1.8 41.3 0 0
   8 Locked QAM256 8 519.0 1.9 41.4 0 0
   9 Locked QAM256 9 525.0 1.8 41.4 0 0
   10 Locked QAM256 10 531.0 1.8 41.5 0 0
   11 Locked QAM256 11 537.0 1.6 41.4 0 0
   12 Locked QAM256 12 543.0 1.6 41.2 0 0
   13 Locked QAM256 13 555.0 1.5 41.2 0 0
   14 Locked QAM256 14 561.0 1.4 41.2 0 0
   15 Locked QAM256 15 567.0 1.8 41.3 0 0
   16 Locked QAM256 16 573.0 1.8 41.3 0 0
   17 Locked QAM256 17 579.0 1.8 41.1 0 0
   18 Locked QAM256 18 585.0 1.8 41.3 0 0
   19 Locked QAM256 19 591.0 2.0 41.2 0 0
   20 Locked QAM256 20 597.0 1.7 41.1 0 0
   21 Locked QAM256 21 603.0 1.5 40.9 0 0
   22 Locked QAM256 22 609.0 1.3 41.0 0 0
   23 Locked QAM256 23 615.0 1.1 40.9 0 0
   24 Locked OFDM PLC 31 690.0 1.9 39.2 105857900 0
   25 Locked QAM256 34 453.0 2.7 41.8 0 0
   26 Locked QAM256 35 459.0 2.4 41.7 0 0
   27 Locked QAM256 36 465.0 2.4 41.5 0 0
   28 Locked QAM256 37 471.0 2.5 41.7 0 0
   29 Locked QAM256 38 423.0 3.3 42.0 0 0
   30 Locked QAM256 39 429.0 3.4 42.1 0 0
   31 Locked QAM256 40 435.0 3.1 42.0 0 0
   32 Locked QAM256 41 441.0 2.6 41.7 0 0

 

Upstream Bonded Channels

   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 1 5120 35.8 46.0
   2 Locked SC-QAM 2 5120 29.4 46.0
   3 Locked SC-QAM 3 5120 23.0 46.0
   4 Locked SC-QAM 4 5120 16.6 45.5

 

Modem Log

Time  Priority  Description 
11:19:03
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:42:04
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:42:11
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:42:37
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:43:07
Wed May 6 2020
Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:55:55
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:56:01
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:57:08
Wed May 6 2020
Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
11:57:18
Wed May 6 2020
Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
12:01:01
Wed May 6 2020
Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
12:01:08
Wed May 6 2020
Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
07:07:17
Mon May 11 2020
Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
10:37:25
Mon May 11 2020
Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 31; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;
10:37:53
Mon May 11 2020
Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 31; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=00:40:36:5c:fa:85;CMTS-MAC=00:01:5c:75:2e:75;CM-QOS=1.1;CM-VER=3.1;

 

 

 

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Re: Motorola MB8600 - Locking up, T3 Time Out Errors

Been running into the exact same issue for about a month now. Around 5 techs have made visits and none have been able to find the issue.

 

Was your issue ever fixed @Shanxx ?