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Intermittent No Ranging Response received - T3 time-out

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Intermittent No Ranging Response received - T3 time-out

Hello,

 

This is my first time posting here, but I have noticed reports as the same issue as mine.

 

As of Sunday, 10/25/2020, I have been experiencing issues with my Upload stream.  I currently use my own equipment, and have used my own equipment since service was started at my location.  The equipment I have is:

  • Netgear CM700 Modem
  • Netgear R7000 Router

When I first noticed the problem on Sunday, 10/25/2020, I ran a speed test and was only able to upload at ~1-2 Mbps, when I have/had the Blast package, which is rated for up to 10 Mbps.  You can see a link below of a speed test ran back on 06/18/2020, at 8:00 PM ET (which I would consider peak usage hours), where I reached speeds of 12 Mbps on upload:

https://www.speedtest.net/result/9628276245

 

Also, every device has no issues remaining connected to Wi-Fi, nor to the Internet, but they are all experiencing the upload performance degradation.

 

Once I discovered this, I called customer support, where they rebooted my modem.  That did not resolve the issue.  I was then told I had to contact Netgear.  Long story short, I was able to get a Comcast technician out on Tuesday, 10/27/2020.  Before the technician arrived I did the following:

  • Swapped Netgear R7000 with spare Netgear R7000.  Same performance results of severely degraded upload speeds
  • Hardwired PC in CM700 instead of R7000.  Same performance results of severely degraded upload speeds
  • Connected Netgear CM7000 to a different cable outlet in the house.  Same performance results of severely degraded upload speeds

When the technician arrived, he checked all my lines and connections, as well as replaced the connectors on my coaxial cable leading from the modem to the outlet, and believed that there was an issue.  However, he could not determine an actual issue in my apartment, or with my equipment, and was going to place a maintenance ticket for investigation outside my apartment.  Also, to note, while the technician was here, I had him deactivate my Netgear CM700 and activate a spare Arris SB6183, to rule out the Netgear CM700 having issues.  The Arris SB6183 experienced the same upload performance degradation.

 

As of 10/29/2020, I am running the Netgear CM700 and upgraded my package from Blast to Extreme Pro, as I was wanting to upgrade before this issue occurred, and thought that if there was some kind of bootfile problem, that may resolve it.  However, as of today, you can see from the speed test link below that I am only averaging ~4-5 Mbps upload since upgrading to a ~20 Mbps upload package:

https://www.speedtest.net/result/10336204638

 

I have also ensured that any and all uncessary splitters, that I can access, have been removed.  This still did not improve my upload performace.

 

Reading around in the forums, I have seen other people reporting the same issue as I am and the common item seems to be these "No Ranging Response received - T3 time-out".  Below I have added all the statistics and logs from my Netgear CM700.  Also, on a last note, as I do not know if it matters, but my Netgear CM700 Current System Time is an hour behind the actual current time.  Let me know if other information is needed.

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel483000000 HzLocked
Connectivity StateOkOperational
Boot StateOkOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)

 

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables
1LockedQAM 25638429000000 Hz8.0 dBmV40.9 dB00
2LockedQAM 25639435000000 Hz8.1 dBmV40.3 dB50
3LockedQAM 25640441000000 Hz8.1 dBmV40.9 dB40
4LockedQAM 25641453000000 Hz8.1 dBmV40.3 dB60
5LockedQAM 25629459000000 Hz8.3 dBmV40.3 dB10
6LockedQAM 25634465000000 Hz8.5 dBmV40.3 dB00
7LockedQAM 25635471000000 Hz8.5 dBmV40.3 dB00
8LockedQAM 25636477000000 Hz8.5 dBmV40.3 dB00
9LockedQAM 2561483000000 Hz8.8 dBmV40.3 dB00
10LockedQAM 2562489000000 Hz9.0 dBmV40.3 dB00
11LockedQAM 2563495000000 Hz9.0 dBmV40.3 dB00
12LockedQAM 2564501000000 Hz9.0 dBmV40.9 dB00
13LockedQAM 2565507000000 Hz9.0 dBmV40.3 dB00
14LockedQAM 2566513000000 Hz8.9 dBmV40.9 dB00
15LockedQAM 2567519000000 Hz9.0 dBmV40.9 dB00
16LockedQAM 2568525000000 Hz8.8 dBmV40.3 dB00
17LockedQAM 2569531000000 Hz8.9 dBmV40.3 dB00
18LockedQAM 25610537000000 Hz9.0 dBmV40.3 dB00
19LockedQAM 25611543000000 Hz8.8 dBmV40.3 dB00
20LockedQAM 25612549000000 Hz9.1 dBmV40.3 dB00
21LockedQAM 25613555000000 Hz9.4 dBmV40.3 dB00
22LockedQAM 25614561000000 Hz9.1 dBmV40.3 dB00
23LockedQAM 25615567000000 Hz9.0 dBmV40.3 dB00
24LockedQAM 25616573000000 Hz9.0 dBmV40.3 dB00
25LockedQAM 25617579000000 Hz9.8 dBmV39.5 dB00
26LockedQAM 25618585000000 Hz10.0 dBmV39.9 dB00
27LockedQAM 25619591000000 Hz10.0 dBmV40.4 dB00
28LockedQAM 25620597000000 Hz10.0 dBmV39.5 dB00
29LockedQAM 25621603000000 Hz9.6 dBmV39.9 dB00
30LockedQAM 25622609000000 Hz10.0 dBmV39.5 dB00
31LockedQAM 25623615000000 Hz10.5 dBmV39.9 dB00
32LockedQAM 25624621000000 Hz10.5 dBmV39.5 dB00

 

Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA45120 Ksym/sec16400000 Hz47.8 dBmV
2LockedATDMA35120 Ksym/sec22800000 Hz46.0 dBmV
3LockedATDMA25120 Ksym/sec29200000 Hz45.8 dBmV
4LockedATDMA15120 Ksym/sec35600000 Hz45.3 dBmV
5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV

 

Event Log

TimePriorityDescription
Oct 02 2020 00:04:00Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Oct 02 2020 00:04:00Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Oct 02 2020 00:04:00Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Oct 02 2020 00:31:29Critical (3)No Ranging Response received - T3 time-out
Oct 02 2020 00:37:32Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 02 2020 17:28:39Critical (3)No Ranging Response received - T3 time-out
Oct 25 2020 15:39:25Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 25 2020 15:42:39Critical (3)No Ranging Response received - T3 time-out
Oct 26 2020 15:01:16Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 26 2020 15:02:29Critical (3)No Ranging Response received - T3 time-out
Oct 26 2020 15:22:58Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 26 2020 15:24:02Notice (6)Received REG-RSP while in REG-HOLD1 state
Oct 26 2020 15:33:49Critical (3)No Ranging Response received - T3 time-out
Oct 26 2020 16:17:52Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 26 2020 16:35:31Critical (3)No Ranging Response received - T3 time-out
Oct 26 2020 16:57:18Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 26 2020 17:11:59Critical (3)No Ranging Response received - T3 time-out
Oct 27 2020 11:42:13Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Oct 27 2020 11:42:19Warning (5)Lost MDD Timeout
Oct 27 2020 11:47:07Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Oct 27 2020 11:47:12Warning (5)Lost MDD Timeout
Oct 27 2020 11:51:08Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Oct 27 2020 11:52:52Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Oct 27 2020 11:52:56Warning (5)Lost MDD Timeout
Oct 27 2020 12:03:22Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 27 2020 12:04:11Critical (3)No Ranging Response received - T3 time-out
Oct 27 2020 12:33:31Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 27 2020 12:33:34Critical (3)No Ranging Response received - T3 time-out
Oct 27 2020 12:34:00Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out
Oct 27 2020 12:47:24Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out
Oct 27 2020 13:02:29Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 27 2020 13:17:43Critical (3)No Ranging Response received - T3 time-out
Oct 27 2020 16:05:42Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 27 2020 16:08:29Critical (3)No Ranging Response received - T3 time-out
Oct 29 2020 08:21:42Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 29 2020 08:21:46Critical (3)No Ranging Response received - T3 time-out
Oct 29 2020 08:43:20Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 29 2020 08:55:34Critical (3)No Ranging Response received - T3 time-out
Oct 29 2020 18:23:12Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 29 2020 18:56:20Critical (3)No Ranging Response received - T3 time-out

 

Best,

Rome Lenares