Anyone know what these errors mean?

[hughesie2006]

Every time my internet drops out (at least once per day) I see messages in the log that look like these….no expert but it looks like the sync between somewhere central and my router is being lost

I use this line for the days I work from home but this dropping out causes total havoc with my company VPN software.

Any thoughts on how to resolve or is this a technician call?

Thanks in advance for any help/advice given!

Time	Priority	Description
18/08/2021 13:40:20	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:40:19	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:40:19	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:29:28	critical	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=3.0;
18/08/2021 13:29:16	Warning!	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:29:12	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:29:11	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:29:11	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:29:1	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:26:48	Warning!	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:26:44	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:26:44	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:26:44	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:14:25	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:14:16	critical	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=3.0;
18/08/2021 13:13:58	Warning!	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:13:54	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:13:53	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:13:53	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/08/2021 13:12:16	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

[Andrew-G · Accepted solution]

That's one nasty network log.  If you want to know what it means, look at the link below.

https://community.virginmedia.com/t5/Speed/Hub-status-data-understanding-network-log-messages/m-p/47...

In terms of what can you do about it, well you can phone VM's telephone support line if you're either naturally lucky, or have masochistic tendencies.  Alternatively:

1) Check the coax connections are done up properly - finger tight

2) Restart the hub if you haven't already (most people have already done this by the time they post here)

3) Try a pinhole reset (wipes all settings and custom passwords)

4) Connect to the hub by clicking on this link http://192.168.0.1/  That should pull up the log in page for the hub.  But don't log in, just click on the link "Check router status"  That'll bring up a window with five tabs.  Open the Downstream tab.  Select all the text (Ctrl-A if using a keyboard), copy it (Ctrl-C), then paste it (Ctrl-V) into a reply here as TEXT not screenshots.  Post that, do the same for the Upstream and Network log in subsequent replies.  You'll get an error message when you post the Network log, just click on "post" a second time.  Then we can check for any obvious problems with power, noise or error counts, but do this only when the hub has been running for 12-24 hours since the last restart, because when restarted all error counters are reset to zero.

[hughesie2006]

Andrew many thanks for all of that…interesting reading your post that you like linked.

I did a reboot today so will wait until it toppled over tomorrow (as it will) and then post the error log and the upstream / downstream logs so it has the 12-24 hrs as you suggest!

Appreciate your help, thank you!

[hughesie2006]

Tipped over again today with the following entries in the network log...I HAVE NOT REBOOTED THE HUB YET

9/08/2021 14:43:35	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/08/2021 14:42:34	critical	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=3.0;

UPSTREAM LOG

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	39400034	38.5	5120	64 qam	4
2	46200017	38.5	5120	64 qam	3
3	53700021	40	5120	64 qam	2
4	60299993	40.8	5120	64 qam	1

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	1	0

DOWNSTREAM LOG

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	1.7	40	256 qam	25
2	267000000	1.5	38	256 qam	17
3	275000000	1.4	40	256 qam	18
4	283000000	1.7	40	256 qam	19
5	291000000	1.7	40	256 qam	20
6	299000000	2	40	256 qam	21
7	307000000	1.9	40	256 qam	22
8	315000000	1.7	40	256 qam	23
9	323000000	2	40	256 qam	24
10	339000000	1.5	40	256 qam	26
11	347000000	1.2	40	256 qam	27
12	355000000	0.5	40	256 qam	28
13	363000000	0.7	40	256 qam	29
14	371000000	0.7	40	256 qam	30
15	379000000	0.5	40	256 qam	31
16	387000000	0.5	40	256 qam	32
17	395000000	0.2	40	256 qam	33
18	403000000	0.2	40	256 qam	34
19	411000000	0.2	40	256 qam	35
20	419000000	-0.2	40	256 qam	36
21	427000000	-0.2	40	256 qam	37
22	435000000	-0.5	40	256 qam	38
23	443000000	-0.5	40	256 qam	39
24	451000000	-0.5	38	256 qam	40

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	40.3	5	0
2	Locked	38.9	5	0
3	Locked	40.3	0	0
4	Locked	40.3	5	0
5	Locked	40.3	0	0
6	Locked	40.3	4	0
7	Locked	40.3	7	0
8	Locked	40.3	0	0
9	Locked	40.3	5	0
10	Locked	40.3	6	0
11	Locked	40.3	0	0
12	Locked	40.9	0	0
13	Locked	40.3	12	0
14	Locked	40.9	9	0
15	Locked	40.3	0	0
16	Locked	40.3	20	0
17	Locked	40.9	14	0
18	Locked	40.3	19	0
19	Locked	40.3	20	0
20	Locked	40.9	0	0
21	Locked	40.3	0	0
22	Locked	40.3	0	0
23	Locked	40.3	4	0
24	Locked	38.9	0	0