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Received Response to Broadcast Maintenance Request But no Unicast Maintenance opportunities received

a-t-w
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Received Response to Broadcast Maintenance Request But no Unicast Maintenance opportunities received

Hello, I'm experiencing internet connectivity issues identical to those described in this post: https://forums.xfinity.com/t5/Your-Home-Network/Received-Response-to-Broadcast-Maintenance-Request-B...

 

My symptoms include intermittent lapses in connection (my coworkers have reported significant stalls/lag on my end during video calls, even though I'm using a wired connection), frequent drops in download speed (well below 50% of the speed I'm paying for) and periodically glacial upload speeds (< 1Mbps). On average these lapses in service occur 2-3 times each day & don't seem to be correlated with internet usage by others in the house. My modem's logs lead me to believe that I'm facing the same issue experienced by @uwinmaine in October 2020 (see post linked above):

 

TimePriorityDescription
2021-2-6, 20:45:40Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:45:08Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:44:20Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:43:48Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:43:01Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:42:28Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:41:41Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:41:08Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:40:21Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:39:48Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:39:01Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:38:28Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:37:41Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:37:09Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:36:21Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:35:49Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:35:01Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:34:29Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:33:42Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:33:10Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:32:22Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:31:49Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:31:02Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:30:29Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:29:42Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:29:09Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:28:22Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:27:49Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:26:42Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:26:10Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:25:02Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:24:30Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:23:22Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:22:50Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:21:43Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:21:10Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:20:23Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:19:50Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:18:43Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;
2021-2-6, 20:18:10Critical (3)Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=44:a5:6e:3a:0c:10;CMTS-MAC=d4:2c:44:7d:7f:1e;CM-QOS=1.1;CM-VER=3.0;

 

 

 

 

My modem is a Netgear CM500 & as far as I can tell it's on the latest firmware version available to me: V1.01.14

 

Here's is some more information that seemed to help resolve the issue in the post linked above:

 

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25613531000000 Hz9.2 dBmV41.3 dB10
2LockedQAM2561453000000 Hz10.2 dBmV42.8 dB10
3LockedQAM25614537000000 Hz8 dBmV40.4 dB40
4LockedQAM25615543000000 Hz7.5 dBmV40.4 dB40
5LockedQAM25616549000000 Hz7.2 dBmV40.2 dB20
6LockedQAM2562459000000 Hz10.9 dBmV42.8 dB199011029
7LockedQAM2563465000000 Hz10.8 dBmV43 dB00
8LockedQAM2564471000000 Hz10.5 dBmV42.5 dB00
9LockedQAM2565477000000 Hz10.5 dBmV42.6 dB10
10LockedQAM2566483000000 Hz10.6 dBmV41.8 dB10
11LockedQAM2567489000000 Hz10.4 dBmV42.3 dB10
12LockedQAM2568495000000 Hz10 dBmV42 dB00
13LockedQAM2569507000000 Hz8.9 dBmV40.1 dB20
14LockedQAM25610513000000 Hz8.9 dBmV41 dB00
15LockedQAM25611519000000 Hz9.4 dBmV41.3 dB30
16LockedQAM25612525000000 Hz9.7 dBmV41.3 dB10
 
Upstream Bonded Channels (Partial Service)
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA65120 Ksym/sec30100000 Hz48.9 dBmV
2LockedATDMA55120 Ksym/sec36500000 Hz50.5 dBmV
3LockedATDMA75120 Ksym/sec23700000 Hz54 dBmV
4Not LockedUnknown80 Ksym/sec17300000 Hz0.0 dBmV

 

I've been experiencing these lapses in service for several months now & no amount of hardware resets / software updates have seemed to improve anything.

 

In the post linked above, @EG and @ComcastMorgan seemed to understand the situation better than I currently do & it looks like they both helped to resolve the issue for @uwinmaine -- can anyone help me understand what might be going on with my modem + whether or not anything can be done to improve my internet service? 

 

Thanks in advance

 

(Original post, once more: https://forums.xfinity.com/t5/Your-Home-Network/Received-Response-to-Broadcast-Maintenance-Request-B...)

EG
Expert

Re: Received Response to Broadcast Maintenance Request But no Unicast Maintenance opportunities rece

The upstream power is high and is already out of spec on channel #3. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there 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 types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

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.



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