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Monday, September 2nd, 2024 2:45 AM

Internet keeps dropping over 10 times a day. Modem log gives "No Ranging Response received - T3 time-out" errors

Modem is Motorola MB8600. Was good at old address. This intermittent connection issue happens at the new address. Beening using the same modem and router. And the timestamps in modem log is 1 hour off. 

   20:22:24
Sun Sep 1 2024
  Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:19
Sun Sep 1 2024
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:21
Sun Sep 1 2024
  Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:22
Sun Sep 1 2024
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:23
Sun Sep 1 2024
  Notice (6)   CM-STATUS message sent. Event Type Code: 6; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:24
Sun Sep 1 2024
  Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:29
Sun Sep 1 2024
  Critical (3)   CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.
    20:23:30
Sun Sep 1 2024
  Critical (3)   CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.2, 258MHz.
    20:23:30
Sun Sep 1 2024
  Critical (3)   CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.3, 1002MHz.
    20:23:30
Sun Sep 1 2024
  Critical (3)   CMSTATUS:US_Diplexer_Mode_Change:TLV-21.1, 5-42MHz.
    20:23:35
Sun Sep 1 2024
  Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:23:42
Sun Sep 1 2024
  Notice (6)   Honoring MDD; IP provisioning mode = IPv6
    20:23:51
Sun Sep 1 2024
  Critical (3)   CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
    20:23:51
Sun Sep 1 2024
  Critical (3)   CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
    20:23:51
Sun Sep 1 2024
  Critical (3)   CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
    20:23:51
Sun Sep 1 2024
  Notice (6)   DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:24:41
Sun Sep 1 2024
  Warning (5)   RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
    20:24:41
Sun Sep 1 2024
  Warning (5)   Dynamic Range Window violation

Downstream Bonded Channels  
  
   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 36 621.0 -1.4 41.3 2925 5391
   2 Locked QAM256 13 483.0 -1.8 41.5 4002 6386
   3 Locked QAM256 14 489.0 -1.6 41.6 3655 5975
   4 Locked QAM256 15 495.0 -1.7 41.7 3654 5969
   5 Locked QAM256 16 501.0 -1.7 40.9 3714 6095
   6 Locked QAM256 17 507.0 -1.6 41.4 3560 5995
   7 Locked QAM256 18 513.0 -1.6 41.4 3704 5877
   8 Locked QAM256 19 519.0 -1.6 40.0 3663 5898
   9 Locked QAM256 20 525.0 -1.6 41.1 3867 6016
   10 Locked QAM256 21 531.0 -1.6 41.7 3502 5768
   11 Locked QAM256 22 537.0 -1.3 41.8 3355 5658
   12 Locked QAM256 23 543.0 -1.1 40.9 3258 5645
   13 Locked QAM256 24 549.0 -1.2 41.5 3200 5752
   14 Locked QAM256 25 555.0 -1.4 41.7 3086 5497
   15 Locked QAM256 26 561.0 -1.4 41.6 3202 5568
   16 Locked QAM256 27 567.0 -1.4 41.5 3250 5516
   17 Locked QAM256 28 573.0 -1.3 41.2 3043 5552
   18 Locked QAM256 29 579.0 -1.2 41.3 3032 5569
   19 Locked QAM256 30 585.0 -1.2 41.6 3145 5375
   20 Locked QAM256 31 591.0 -1.4 41.5 2935 5539
   21 Locked QAM256 32 597.0 -1.4 40.9 3081 5376
   22 Locked QAM256 33 603.0 -1.3 41.1 3097 5390
   23 Locked QAM256 34 609.0 -1.4 41.5 3190 5392
   24 Locked QAM256 35 615.0 -1.4 41.3 2848 5354
   25 Locked QAM256 37 627.0 -1.4 41.4 2957 5319
   26 Locked QAM256 38 633.0 -1.1 41.5 2736 5135
   27 Locked QAM256 39 639.0 -1.1 41.6 2611 5172
   28 Locked QAM256 40 645.0 -1.3 41.4 2784 4985
   29 Locked QAM256 41 651.0 -1.3 41.3 2804 5043
   30 Locked QAM256 42 657.0 -1.5 41.3 2640 4900
   31 Locked QAM256 43 663.0 -1.5 41.3 2699 4971
   32 Locked QAM256 44 669.0 -1.6 41.0 2727 4869
   33 Locked OFDM PLC 193 722.0 -0.7 40.8 185892203 6505


   Upstream Bonded Channels  
  
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 17 5120 16.4 48.3
   2 Locked SC-QAM 18 5120 22.8 48.3
   3 Locked SC-QAM 19 5120 29.2 48.8
   4 Locked SC-QAM 20 5120 35.6 49.3
   5 Locked SC-QAM 21 2560 40.4 51.3
   6 Locked SC-QAM 22 2560 10.4 47.3

Expert

 • 

106.9K Messages

2 months ago

@user_83nhzb 

Please redact all of the CM MAC and the CMTS MAC addresses from your error log entries for your privacy. They are considered to be personal information. The posting of personally identifiable information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publicly. It flagged your post as "Private".

That said. The upstream power is on the high side (it's already out of spec on channel #5) and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.


Good luck with it !

5 Messages

Thank you very much EG! I've edited out the MAC addresses. Will check connectivitiy and cable lines.

Expert

 • 

106.9K Messages

2 months ago

Quite welcome ! I made your post publicly viewable again. Please post back about how things go, thanks.

5 Messages

Thank you @EG!

I've checked the connections from where the coax cable enters the house to the wall outlet. There is no splits, only one addtional connection in the attic. I've disconnected and reconnected and tighten them up. Now the Pwr for Upstream Channel #5 dropped to 49.3 from previous 51.2.

Will see if it will drop connections.

 Upstream Bonded Channels  
  
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 17 5120 16.4 46.5
   2 Locked SC-QAM 18 5120 22.8 47.3
   3 Locked SC-QAM 19 5120 29.2 48.0
   4 Locked SC-QAM 20 5120 35.6 48.3
   5 Locked SC-QAM 21 2560 40.4 49.3
   6 Locked SC-QAM 22 2560 10.4 45.5

Expert

 • 

106.9K Messages

2 months ago

Still not much wiggle room there... Live with it for awhile and see.

5 Messages

2 months ago

Update: no more drops so far. A Xfinity tech came over and added a connection box for the outdoor connector and filter. Channel #5 power drops to 49. Still good so far.

Expert

 • 

106.9K Messages

2 months ago

49.... I'll state this again. Still not much wiggle room there... Live with it for a while and see. Hope things hold up for you ! Good luck !

5 Messages

Thank you EG! I sure hope so :-)

Expert

 • 

106.9K Messages

2 months ago

My pleasure !

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