SYNC Timing Synchronization failure - Loss of Sync

[Bill_Carson]

Hi All,

first post here, and its for syc timing errors. this issues started a few days ago , the internet was cutting out and then coming back. i have rebooted all the kit. switched it off for 10 mins and then turned it back on etc etc. still getting the same issue. called VM and the automated system said they needed to send a signal to the kit, did that and it rebooted everything. still same issue.

Network Log:

Time	Priority	Description
22/06/2020 10:35:56	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2020 10:35:56	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2020 09:00:45	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2020 06:41:17	Error	DHCP REBIND WARNING - Field invalid in response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 23:10:52	Error	DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 18:03:14	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 17:58:32	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 17:28:4	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 15:40:31	Error	DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 09:14:47	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 09:13:50	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 08:22:22	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/06/2020 00:39:48	Error	DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2020 21:58:27	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2020 21:58:27	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2020 21:57:0	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2020 21:18:8	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2020 21:16:36	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

[jongosling]

An engineer came and replaced some cabling which was corroded (outside the house). However this issue has returned with a vengeance! For the last week, we have been riddled with dropouts, PSB snapshots and logs.

Downstream bonded channels

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

1	203000000	4.5	40	256 qam	9
2	211000000	4	38	256 qam	10
3	219000000	4.5	38	256 qam	11
4	227000000	3.9	38	256 qam	12
5	235000000	3.5	38	256 qam	13
6	243000000	4.5	40	256 qam	14
7	251000000	4.9	40	256 qam	15
8	259000000	5.3	38	256 qam	16
9	267000000	5.5	38	256 qam	17
10	275000000	5.5	40	256 qam	18
11	283000000	5.6	38	256 qam	19
12	291000000	6	40	256 qam	20
13	299000000	6.6	38	256 qam	21
14	307000000	6.5	40	256 qam	22
15	315000000	6.5	38	256 qam	23
16	323000000	6.1	38	256 qam	24
17	331000000	6.4	40	256 qam	25
18	339000000	6.5	40	256 qam	26
19	347000000	6.5	40	256 qam	27
20	355000000	6.6	38	256 qam	28
21	363000000	7	40	256 qam	29
22	371000000	7	40	256 qam	30
23	379000000	6.8	38	256 qam	31
24	387000000	6.4	40	256 qam	32

Downstream bonded channels

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

1	Locked	40.3	56921	124778
2	Locked	38.9	74552	192971
3	Locked	38.9	70766	114630
4	Locked	38.6	64990	172096
5	Locked	38.9	82533	142864
6	Locked	40.3	76872	70158
7	Locked	40.9	67927	51851
8	Locked	38.9	2313589	35597
9	Locked	38.9	56510294	28506
10	Locked	40.9	241276457	25831
11	Locked	38.9	380869069	28429
12	Locked	40.3	218743013	25823
13	Locked	38.9	248974335	22766
14	Locked	40.3	434744062	20154
15	Locked	38.9	248072524	17867
16	Locked	38.9	248227103	16951
17	Locked	40.9	429232367	15636
18	Locked	40.3	244491494	13955
19	Locked	40.3	244207600	12645
20	Locked	38.9	434986094	11660
21	Locked	40.3	236069013	10777
22	Locked	40.3	244856137	9705
23	Locked	38.9	375631934	8733
24	Locked	40.3	42489192	8274

Upstream bonded channels

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

1	36600000	45	5120	64 qam	3
2	43100000	46.3	5120	64 qam	2
3	30100000	46.8	5120	64 qam	4
4	23600000	46.3	5120	64 qam	5
5	49600000	48.5	5120	64 qam	1

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

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

[jongosling]

Network Log

Time Priority Description

15/04/2024 07:53:2	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:52:59	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:52:59	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:51:5	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:51:5	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:47:25	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:47:25	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:47:25	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:46:59	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:43:54	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:41:46	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:40:16	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:40:16	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:32:47	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:32:38	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:19:52	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:14:35	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:14:35	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:04:16	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/04/2024 07:01:52	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

Any thoughts or solutions would be gratefully received!

Jon

[jongosling]

The dropouts continue, with exceptionally unreliable service between 6am - 12 pm.

[jongosling]

 17 Apr 24

[Joseph_B]

Hey @jongosling,

Thanks for getting back to us, sorry that you are still having this issue, based upon the checks we can run your system shows as fine, however we can see you are using your Hub in Modem mode, with this we are limited in what we can see from our side diagnostics wise.

Joe

[jongosling]

Joe,  I’ve removed the 3rd party router and returned the Hub 3.0 to router mode (including a factory reset). Please re-run the system checks as the problem persists (pictured is the 24hr window since the Hub 3.0 was reinstated as modem & router). 

 

thanks, Jon

[jongosling]

Downstream bonded channels

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

1	203000000	4.8	38	256 qam	9
2	139000000	5.4	38	256 qam	1
3	147000000	5.9	38	256 qam	2
4	155000000	6	40	256 qam	3
5	163000000	6.1	40	256 qam	4
6	171000000	6.9	40	256 qam	5
7	179000000	7.4	40	256 qam	6
8	187000000	6.8	40	256 qam	7
9	195000000	4.5	38	256 qam	8
10	211000000	4.3	38	256 qam	10
11	219000000	5	38	256 qam	11
12	227000000	4.5	38	256 qam	12
13	235000000	4	38	256 qam	13
14	243000000	4.9	40	256 qam	14
15	251000000	5.3	40	256 qam	15
16	259000000	5.6	38	256 qam	16
17	267000000	5.9	38	256 qam	17
18	275000000	5.8	40	256 qam	18
19	283000000	5.9	38	256 qam	19
20	291000000	6.4	40	256 qam	20
21	299000000	6.9	38	256 qam	21
22	307000000	6.9	38	256 qam	22
23	315000000	6.6	38	256 qam	23
24	323000000	6.4	38	256 qam	24

Downstream bonded channels

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

1	Locked	38.9	33415	41247
2	Locked	38.6	69819	26057
3	Locked	38.9	54390	20843
4	Locked	40.3	47901	13597
5	Locked	40.3	43883	14006
6	Locked	40.3	35479	10872
7	Locked	40.3	19777	2161
8	Locked	40.3	15001	3102
9	Locked	38.9	30446	30161
10	Locked	38.6	43062	68139
11	Locked	38.9	40366	30173
12	Locked	38.9	35015	42852
13	Locked	38.9	46164	42669
14	Locked	40.3	39550	19798
15	Locked	40.3	33278	13355
16	Locked	38.6	1239318	9919
17	Locked	38.9	30316717	6760
18	Locked	40.3	129504259	5794
19	Locked	38.9	203386489	6949
20	Locked	40.3	114562946	6400
21	Locked	38.9	133487559	5204
22	Locked	38.9	231173890	4361
23	Locked	38.9	133280461	3568
24	Locked	38.9	133105981	3318

Upstream bonded channels

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

1	36600000	45.3	5120	64 qam	3
2	43100000	46.5	5120	64 qam	2
3	30100000	46.5	5120	64 qam	4
4	49600000	48	5120	64 qam	1
5	23599688	46.8	5120	64 qam	5

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

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

 

[jongosling]

Network Log

Time Priority Description

26/04/2024 08:06:33	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 08:06:33	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 08:06:33	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 08:04:1	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:59:8	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:54:14	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:44:23	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:44:23	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:24:14	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:24:14	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 07:13:22	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:56:28	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:28:2	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:28:2	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:28:2	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:24:50	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:07:28	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 06:07:28	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 05:42:38	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/04/2024 05:30:34	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

[jpeg1]

Still horrendous noise and consequent data loss on all download channels. This connection is not fit for purpose. 

[Roger_Gooner]

The Post RS Errors on every downstream channel shows that there is still a problem somewhere, an a tech should attend again.