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Sat, Feb 6, 2021 6:00 PM

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-But-no/td-p/3375716

 

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-But-no/td-p/3375716#)

Responses

EG

Expert

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89.1K Messages

7 m ago

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.

Visitor

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5 Messages

2 m ago

I had a Netgear C6300 which worked well for five or so years.  It would drop connection but automatically restore maybe 2 or 3 times a month.  I upgraded Comcast to 800 Mbps and that old router would only make ~ 550 so I got a new Netgear $500 Orbi setup with a CBR750 gateway.  It was making 950 but would drop the Internet 2 or 3 times a day on my Eithernet connected PC: I know it wasn't a WiFi problem.  After a few days I called Netqear twice and Comcast twice with no help after hours on the phone.  I gave up on the Orbi after a couple of weeks of re-booting and got a Netgear C7000 which is making over 800 with DOCSIS 3.0, the Orbi was 3.1.  That has dropped the web several times in the last couple of days.  My upstream power is across the channels is -3.7 to .2 dBmV with the S/N 34.6 to 38.5 dB.  Upstream reports 33 DBMv with 5 channels locked.  On both new modems they would report a "Good" cable connection even when there was no Internet connecting.  I tried using manual DNS servers also; to no avail.  The Internet never came back on its on like the old modem, it always requires a re-boot to get it back.

How do I fix this?  I think calling Netgear or Comcast support is a waste of time, they don't even hear or understand the problem!

EG

Expert

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89.1K Messages

@user_aaa08a

Please create a new topic of your own here on this board detailing your issue and I will attempt to assist you there. Please do not hijack someone else's help thread in progress please. Thank you.
 

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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Visitor

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1 Message

@user_aaa08a,

Thank you! 

After a year and a half of non-stop nonsense, I went out and wired the connection the way you mentioned and the blinking downstream light on my modem went solid lit immediately!

Hopefully this will be the end of all of my issues with internet connectivity. 

EG

Expert

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89.1K Messages

Very good ! The original poster has not returned. 7 month old thread now being closed.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick

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