Noisey line - SNR

[mellatron]

Have got a noisey line since Virgin did some area work to "fix" local issues. Getting lots of SYNC Timing Synchronization failure - Loss of Sync errors in the hub network logs as well as T3 timeouts. Latency issues mean working from home is impossable.

Had an engingeer out due to lots of connection drop outs who reported the SNR issues to the Network Team but have heard nothing back regarding a repair. Same engineer told me our local area was over subscribed and the street cabinets were a mess.

One of my neighbours was told by a contractor the street cable needed replacing, no one seems to know what is going on. Can anyone help?

ownstream bonded channels

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

1	331000000	7.6	42	QAM 256	25
2	139000000	8.4	41	QAM 256	1
3	147000000	8.3	41	QAM 256	2
4	155000000	8.3	41	QAM 256	3
5	163000000	8.3	41	QAM 256	4
6	171000000	8.3	41	QAM 256	5
7	179000000	8.4	41	QAM 256	6
8	187000000	8.6	41	QAM 256	7
9	195000000	8.4	41	QAM 256	8
10	203000000	8.3	41	QAM 256	9
11	211000000	8.3	41	QAM 256	10
12	219000000	8.1	41	QAM 256	11
13	227000000	7.9	41	QAM 256	12
14	235000000	7.9	41	QAM 256	13
15	243000000	7.6	41	QAM 256	14
16	251000000	7.6	41	QAM 256	15
17	259000000	7.5	41	QAM 256	16
18	267000000	7.6	41	QAM 256	17
19	275000000	7.7	41	QAM 256	18
20	283000000	7.7	41	QAM 256	19
21	291000000	7.6	41	QAM 256	20
22	299000000	7.6	41	QAM 256	21
23	307000000	7.7	41	QAM 256	22
24	315000000	7.6	42	QAM 256	23
25	323000000	7.7	42	QAM 256	24
26	339000000	7.3	41	QAM 256	26
27	347000000	7.3	41	QAM 256	27
28	355000000	7.4	41	QAM 256	28
29	363000000	7.5	42	QAM 256	29
30	371000000	7.6	42	QAM 256	30
31	379000000	7.8	42	QAM 256	31

Downstream bonded channels

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

1	Locked	42	8	0
2	Locked	41	9	0
3	Locked	41	14	0
4	Locked	41	10	0
5	Locked	41	18	0
6	Locked	41	9	0
7	Locked	41	11	0
8	Locked	41	4	0
9	Locked	41	12	0
10	Locked	41	8	0
11	Locked	41	9	0
12	Locked	41	6	0
13	Locked	41	4	0
14	Locked	41	11	0
15	Locked	41	13	0
16	Locked	41	15	0
17	Locked	41	6	0
18	Locked	41	12	0
19	Locked	41	13	0
20	Locked	41	13	0
21	Locked	41	10	0
22	Locked	41	8	0
23	Locked	41	8	0
24	Locked	42	15	0
25	Locked	42	15	0
26	Locked	41	16	0
27	Locked	41	14	0
28	Locked	41	10	0
29	Locked	42	3	0
30	Locked	42	12	0
31	Locked	42	15	0

Upstream bonded channels

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

0	49600000	44.5	5120	QAM 64	1
1	43100000	43.5	5120	QAM 64	2
2	36600000	42.5	5120	QAM 64	3
3	30100000	42.3	5120	QAM 64	4
4	23600000	41.5	5120	QAM 64	5

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	18	0
4	ATDMA	0	0	0	0

General Configuration

Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file

Allowed

1

Enabled

3.1

,.iyewrkldJKDHSUBsgvca698

Network Log

Time Priority Description

28-09-2023 13:33:03	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-09-2023 13:32:35	notice	CM-STATUS message sent. Event Type Code: 22; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-09-2023 13:29:00	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-09-2023 13:28:39	notice	CM-STATUS message sent. Event Type Code: 20; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-09-2023 02:00:03	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-09-2023 01:59:56	error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:33:04	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:32:56	warning	TCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:32:03	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:31:56	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:18:07	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:17:56	warning	TCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:17:00	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:16:56	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:05:17	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:05:00	critical	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:05:00	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:05:00	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:04:02	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:03:40	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:02:02	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:01:40	warning	TCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:01:20	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:01:04	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 03:00:40	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
23-09-2023 02:48:25	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
22-09-2023 13:59:51	error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
21-09-2023 14:04:17	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
21-09-2023 14:04:17	notice	US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
21-09-2023 13:54:14	notice	US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
21-09-2023 13:54:14	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
20-09-2023 21:46:48	warning	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[Client62]

Line does not exhibit the obvious signs of an SNR issue.

[mellatron]

Interesting, thanks.The dropouts are getting less frequent, I just wish Virgin would communicate with their customers so we know what's going on. That seems a strech when the different departments can't talk to each other though.

[Beth_G]

Hi mellatron,

Thank you for your post. I'm so sorry to hear you've been having a lot of trouble with your broadband recently.

Your BQM graph looks very good and stable, no sign of bad latency or packet loss, however looking at this end, a lot of your broadband downstream levels are out of spec, so I'll need to arrange for another engineer to take a look.

I'll pop over a private message now so I can help further.