Virgin Media Community

[Sakuuu]

Hi All, 

I have noted I have quite a few drops, see the "No Ranging Response received" below from the logs:

etwork Log

Time Priority Description

13/01/2021 16:22:26	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/01/2021 16:22:3	Warning!	LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/01/2021 03:11:27	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/01/2021 01:21:9	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/01/2021 13:20:21	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/01/2021 12:43:56	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:37	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/01/2021 00:04:15	notice	SW download Successful - Via NMS
11/01/2021 00:00:38	notice	SW Download INIT - Via NMS
10/01/2021 03:36:47	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/01/2021 03:19:37	Error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 21:08:42	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 21:00:58	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 20:57:31	Warning!	LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 17:48:55	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 16:22:19	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 16:21:29	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/01/2021 15:50:22	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/01/2021 18:03:18	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/01/2021 17:40:8	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

I have looked and power / SNR levels seem ok to me, both up and down, but please comment if they seem off:

Downstream:

ownstream bonded channels

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

1	266750000	0	38	256 qam	17
2	138750000	1.2	37	256 qam	1
3	146750000	1.5	37	256 qam	2
4	154750000	1.5	37	256 qam	3
5	162750000	1.2	37	256 qam	4
6	170750000	1.7	37	256 qam	5
7	178750000	1.5	38	256 qam	6
8	186750000	1.4	37	256 qam	7
9	194750000	1	38	256 qam	8
10	202750000	0.9	37	256 qam	9
11	210750000	0.5	37	256 qam	10
12	218750000	0.9	37	256 qam	11
13	226750000	0.5	37	256 qam	12
14	234750000	0.5	37	256 qam	13
15	242750000	0.2	37	256 qam	14
16	250750000	0	38	256 qam	15
17	258750000	0.2	38	256 qam	16
18	274750000	0	37	256 qam	18
19	282750000	0.2	38	256 qam	19
20	290750000	0	37	256 qam	20
21	298750000	0.4	37	256 qam	21
22	306750000	0	37	256 qam	22
23	314750000	0.4	38	256 qam	23
24	322750000	0	37	256 qam	24

Upstream

Upstream bonded channels

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

1	32599916	49.5	5120	16 qam	5
2	46200004	49.3	5120	16 qam	3
3	39399795	49	5120	16 qam	4
4	25799947	49.3	5120	16 qam	6

I guess what stands out is the modulation at 16 qam, on all four channels, obviously it would usually be 64, or even 32 (not ideal), but the drop to 16 on all 4 channels is concerning, and is service impacting, in that my router keeps freezing and requiring reboot and also streaming video via upload is impacted greatly. 

Are you able to take a look at the stats and info overall and come back with suggestions? Also - how would I best proceed with an engineer etc as required?

[Z92]

Can you post the rest of the downstream channels? There should be another table below it with more data. 

[Sakuuu]

See below - modem has been up for approx 5 mins hence the ES are not much use, I will setup a Broadband Quality Monitor (BQM) also.    Downstream bonded channels

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

1	Locked	38.6	6	0
2	Locked	37.6	69	0
3	Locked	37.6	91	0
4	Locked	37.6	71	0
5	Locked	37.6	31	0
6	Locked	37.6	41	0
7	Locked	38.6	11	0
8	Locked	37.6	19	0
9	Locked	38.6	3	0
10	Locked	37.6	22	0
11	Locked	37.6	9	0
12	Locked	37.3	39	0
13	Locked	37.6	8	0
14	Locked	37.6	9	0
15	Locked	37.6	7	0
16	Locked	38.6	1	0
17	Locked	38.6	6	0
18	Locked	37.6	7	0
19	Locked	38.6	6	0
20	Locked	37.6	4	0
21	Locked	37.6	18	0
22	Locked	37.6	6	0
23	Locked	38.6	20	0
24	Locked	37.6	2	0

[jk1990]

Once you have over 24hrs uptime can you repost the info above, so we can see ES overtime. 

Getting resolution for these sorts of issues is challenging, are you able to share BQM link also, please?