Virgin Media Community

[jeepwilliams]

Although my broadband seems to always be active, with top speeds (100mb) the connect has seemed unstable for the past 3 weeks to a month, with online activity feeling sluggish a laggy.

Latency seems fine, and I've started a broadband monitor to see what's what, but I have noticed these issues via the Hub 3. Although I'm not entirely sure what they mean.

I have factory reset the hub, other equipment, used a DMZ, and the other standard stuff. Any pointers on what the issue might be?

9/02/2021 22:07:39	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:12	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:7	Warning!	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:3	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:2	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:2	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:37:2	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 21:15:49	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 17:43:39	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/02/2021 17:43:39	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 12:09:51	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 12:09:51	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 07:00:19	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 06:40:5	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 05:48:38	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/02/2021 05:48:38	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
17/02/2021 23:29:29	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
17/02/2021 23:29:29	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
17/02/2021 20:17:57	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
17/02/2021 18:30:23	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

Acquired Downstream Channel (Hz)	419000000	Locked
Ranged Upstream Channel (Hz)	46199629	Locked

[tehwolf]

post the upstream and downstream data from the same place you got the logs.. 

also, be useful to see a "share link" of the BQM you set up.. 

[jeepwilliams]

1	419000000	3.9	40	256 qam	32
2	203000000	5.6	40	256 qam	9
3	211000000	5.4	40	256 qam	10
4	219000000	5	40	256 qam	11
5	227000000	4.8	40	256 qam	12
6	235000000	4.5	40	256 qam	13
7	243000000	4.4	40	256 qam	14
8	251000000	4.4	40	256 qam	15
9	259000000	4.4	40	256 qam	16
10	267000000	4.4	40	256 qam	17
11	275000000	4.6	40	256 qam	18
12	283000000	4.9	40	256 qam	19
13	291000000	4.9	40	256 qam	20
14	299000000	4.9	40	256 qam	21
15	307000000	5	40	256 qam	22
16	315000000	5	40	256 qam	23
17	323000000	5	40	256 qam	24
18	363000000	4.1	40	256 qam	25
19	371000000	4	40	256 qam	26
20	379000000	4	40	256 qam	27
21	387000000	3.9	40	256 qam	28
22	395000000	3.7	40	256 qam	29
23	403000000	3.7	40	256 qam	30
24	411000000	3.9	40	256 qam	31

Downstream bonded channels

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

1	Locked	40.3	22	107
2	Locked	40.9	26	126
3	Locked	40.3	26	130
4	Locked	40.3	23	113
5	Locked	40.3	24	120
6	Locked	40.3	34	239
7	Locked	40.3	23	109
8	Locked	40.9	17	135
9	Locked	40.3	28	110
10	Locked	40.3	33	92
11	Locked	40.3	23	109
12	Locked	40.9	32	123
13	Locked	40.3	24	117
14	Locked	40.3	29	183
15	Locked	40.3	22	126
16	Locked	40.3	44	204
17	Locked	40.3	31	131
18	Locked	40.3	26	115
19	Locked	40.3	26	127
20	Locked	40.3	27	119
21	Locked	40.3	22	128
22	Locked	40.9	22	100
23	Locked	40.3	32	107
24	Locked	40.3	31	150

I have only just set the BQM up, so there's not much to see on there as yet.

[tehwolf]

power levels on downstream are all within spec but you have post-rs errors on all of the channels - they're not huge numbers, but they're there - when did you last reboot the hub, and how quickly do they accumulate?

your logs also show quite a lot of channel drops (rcs partial service) which is a concern.

you haven't uploaded the upstream tab yet.. be useful to see it.

[jeepwilliams]

Upstream bonded channels

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

1	46199629	41.7	5120	64 qam	3
2	39400012	39.8	5120	64 qam	4
3	53700024	41.8	5120	64 qam	2
4	60299988	43.3	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	0	0

I've restarted the hub a few times during this week after each troubleshooting attempt, so they seem to accumulate quickly...

What are post-er errors, and any idea what would possibly cause channel drops?

[tehwolf]

nothing wrong with the upstream.

everything is within spec, i don't know if the volume of errors you're seeing is problematic. post-rs errors are when a damaged/malformed packet arrives at the hub, if the hub can fix the packet it increments the pre-rs counter, if the hub can't fix it then it becomes a post-rs error.  Generally speaking, the closer to 0 the better.  There are examples of them being in the tens of thousands so, like i said, at the volume you're seeing i am not sure how big of an issue it is..

let's see how the BQM looks tomorrow..

[jeepwilliams]

Yeah, like I said speeds seem generally fine on paper. Very frustrating.

https://www.thinkbroadband.com/broadband/monitoring/quality/view/b1ef8452955b53db38f9d3c5c0e05748354...

[jeepwilliams]

I'm having an issue posting my BQM results here, have tried all the available links but none seem to be valid/redirect to an invalid link... 

[jeepwilliams]

https://www.thinkbroadband.com/broadband/monitoring/quality/share/4f3827e8254a8382385892131d5ee75759... 

[jeepwilliams]

bumped.