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No Ranging Response received - T3 time-out

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No Ranging Response received - T3 time-out

Having intermittent slow connection, with my modem throwing out the following errors:

 

Time Priority Description
Wed Mar 14 17:38:01 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 17:38:01 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 17:46:29 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 17:46:29 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 18:13:06 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 18:13:06 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 18:19:20 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 18:23:58 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 18:46:23 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Wed Mar 14 19:17:16 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 12:32:39 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 12:49:12 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 13:35:24 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 13:35:26 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 13:39:40 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 15:49:36 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 17:32:04 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 17:32:04 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 17:43:07 2018 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;
Thu Mar 15 18:16:57 2018 3 No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3a:38:b7;CMTS-MAC=00:01:5c:72:16:60;CM-QOS=1.1;CM-VER=3.0;

 

 

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel   Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK  
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed  

 

 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked 256QAM 18 663.00 MHz 0.50 dBmV 38.61 dB 4965 31855
2 Locked 256QAM 1 561.00 MHz 0.40 dBmV 38.98 dB 5442 39558
3 Locked 256QAM 2 567.00 MHz 0.60 dBmV 38.98 dB 5544 40206
4 Locked 256QAM 3 573.00 MHz -0.20 dBmV 38.61 dB 6032 39832
5 Locked 256QAM 4 579.00 MHz 0.30 dBmV 38.61 dB 5956 39226
6 Locked 256QAM 5 585.00 MHz -0.10 dBmV 38.61 dB 6401 40238
7 Locked 256QAM 6 591.00 MHz 0.80 dBmV 38.98 dB 5696 34890
8 Locked 256QAM 7 597.00 MHz 0.40 dBmV 38.98 dB 5718 38109
9 Locked 256QAM 8 603.00 MHz 0.50 dBmV 40.37 dB 6377 38138
10 Locked 256QAM 9 609.00 MHz 0.00 dBmV 38.61 dB 4526 29864
11 Locked 256QAM 10 615.00 MHz 0.40 dBmV 38.61 dB 5956 36142
12 Locked 256QAM 11 621.00 MHz 0.10 dBmV 38.98 dB 5465 35575
13 Locked 256QAM 12 627.00 MHz 0.70 dBmV 38.98 dB 4904 38196
14 Locked 256QAM 13 633.00 MHz 0.50 dBmV 38.98 dB 4747 33953
15 Locked 256QAM 14 639.00 MHz 1.10 dBmV 38.98 dB 4467 30809
16 Locked 256QAM 15 645.00 MHz 1.10 dBmV 38.61 dB 4131 25679
17 Locked 256QAM 16 651.00 MHz 0.50 dBmV 38.61 dB 4788 31567
18 Locked 256QAM 17 657.00 MHz 1.20 dBmV 38.61 dB 4123 27315
19 Locked 256QAM 19 669.00 MHz 0.90 dBmV 38.61 dB 4923 32849
20 Locked 256QAM 20 675.00 MHz 1.10 dBmV 38.61 dB 4563 30847
21 Locked 256QAM 21 681.00 MHz 1.20 dBmV 38.61 dB 4783 29841
22 Locked 256QAM 22 687.00 MHz 0.90 dBmV 38.98 dB 3523 22871
23 Locked 256QAM 23 693.00 MHz 0.80 dBmV 38.61 dB 3764 27960
24 Locked 256QAM 24 699.00 MHz 0.80 dBmV 37.64 dB 4194 29404
25 Locked 256QAM 25 705.00 MHz -0.30 dBmV 38.20 dB 67 1638
26 Locked 256QAM 26 711.00 MHz -0.80 dBmV 37.90 dB 38 1493
27 Locked 256QAM 27 717.00 MHz -0.10 dBmV 38.20 dB 88 1496
28 Locked 256QAM 28 723.00 MHz -0.70 dBmV 38.20 dB 52 1440

 

 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 42 5120 kSym/s 29.40 MHz 47.50 dBmV
2 Locked ATDMA 43 5120 kSym/s 23.00 MHz 48.00 dBmV
3 Locked ATDMA 41 5120 kSym/s 35.80 MHz 46.50 dBmV


 

 

 

Diamond Problem Solver

Re: No Ranging Response received - T3 time-out

The stats as read at the modem level at that moment in time were o/k if they are remaining stable, but there are three additional signal stats that can cause those errors which can't be read by the modem. They can only be read from their end by them polling the CMTS (Cable Modem Termination System) at the local headend facility.

They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

You can call in and ask what these figures are. The Upstream Receive Power Level should fall within the range of -2dB to +2dB with 0dB being in the middle and perfect.

The Upstream SNR should be least 31dB, and the higher it is the better.

The ICFR should be no higher than 2 dB.

You could have an intermittent noise ingress issue in only the upstream channel(s) / return path only somewhere.

They will be able to see whether or not everything is in the green zone and also see a history plot for the modem.


Expert

Re: No Ranging Response received - T3 time-out

Hi @tjiang92,

Best thing is to have an employee to take a look at your levels and node health.

 

I've asked a Comcast employee to help you. You should expect a reply in this thread. 


I am not a Comcast employee, just a moderator. Pls observe Wheaton's Law.
Official Employee

Re: No Ranging Response received - T3 time-out

Hi tjiang92. I can assist further in checking the diagnostics from your modem to help troubleshoot your intermittent slow connection. Please send me a private message and include your full name and account primary phone number so I can access your equipment.