Dropouts after midnight daily

[Anonymous]

Been having dropouts for the past couple of days after midnight.
Checked the modem noticed upstream issues.
Which I believe is indictive of a mainline issue.
Not sure where the fault lies.

Unfortunately support via customer services hasn't yielded much help.
They just said they would monitor it and let techs know.

13/12/2022 08:00:30	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/12/2022 02:22:38	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/12/2022 02:22:34	Warning!	TCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/12/2022 02:22:34	Warning!	Initializing Channel Timeout Expires - Time the CM can perform initial ranging on all upstream channels in the TCS has expired;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/12/2022 19:14:42	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/12/2022 00:15:17	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/12/2022 00:10:12	Warning!	TCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/12/2022 00:10:12	Warning!	Initializing Channel Timeout Expires - Time the CM can perform initial ranging on all upstream channels in the TCS has expired;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 19:40:8	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:27	Warning!	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:24	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:24	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:23	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:22	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:13	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:13	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2022 10:55:12	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

[Anonymous]

Upstream bonded channels

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

1	39400000	51	5120	64 qam	2
2	25800000	51	5120	64 qam	4
3	46200000	51	5120	64 qam	1
4	32600000	51	5120	64 qam	3

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

[Anonymous]

Downstream bonded channels

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

1	234750000	2.4	38	256 qam	13
2	242750000	2.2	38	256 qam	14
3	250750000	2.5	38	256 qam	15
4	258750000	2.5	38	256 qam	16
5	266750000	2.7	38	256 qam	17
6	274750000	2.7	38	256 qam	18
7	282750000	3	38	256 qam	19
8	290750000	3	38	256 qam	20
9	298750000	3.4	38	256 qam	21
10	306750000	3.2	38	256 qam	22
11	314750000	3.5	38	256 qam	23
12	322750000	3.4	38	256 qam	24
13	330750000	3.5	38	256 qam	25
14	338750000	3.5	38	256 qam	26
15	346750000	3.5	38	256 qam	27
16	354750000	3.2	38	256 qam	28
17	362750000	3.5	38	256 qam	29
18	370750000	3.5	38	256 qam	30
19	378750000	3.7	38	256 qam	31
20	386750000	3.4	38	256 qam	32
21	394750000	3.5	38	256 qam	34
22	402750000	3.4	38	256 qam	35
23	410750000	3.7	38	256 qam	36
24	418750000	3.5	38	256 qam	37

Downstream bonded channels

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

1	Locked	38.9	6	0
2	Locked	38.6	2	0
3	Locked	38.9	7	0
4	Locked	38.6	4	0
5	Locked	38.9	6	0
6	Locked	38.6	6	0
7	Locked	38.6	5	0
8	Locked	38.6	7	0
9	Locked	38.6	8	0
10	Locked	38.9	6	0
11	Locked	38.9	5	0
12	Locked	38.6	8	0
13	Locked	38.6	4	0
14	Locked	38.9	7	0
15	Locked	38.9	8	0
16	Locked	38.9	2	0
17	Locked	38.9	6	0
18	Locked	38.9	7	0
19	Locked	38.6	6	0
20	Locked	38.6	7	0
21	Locked	38.9	6	0
22	Locked	38.9	8	0
23	Locked	38.6	9	0
24	Locked	38.9	9	0

[Anonymous]

Interesting situation
I saw someone mention a bad attenuator in another thread.
What do you know, when I removed the cable, it was completely bent.
I'm not sure how this occurred, but I've since changed the attenuator.

From a previous cable that was installed on the same line before.
Strangely, the previous occupant had no problems.
Second hint: Our attenuator is too high.
Latency and jitter are much more stable when using one rated at 3db as opposed to 6db.
As far as I can tell, the problem may have been the downstream rather than upstream.

No matter what we do, upstream remains at 51.

[Anonymous]

Downstream bonded channels

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

1	234750000	5.4	38	256 qam	13
2	242750000	5.3	38	256 qam	14
3	250750000	5.5	38	256 qam	15
4	258750000	5.5	38	256 qam	16
5	266750000	5.9	38	256 qam	17
6	274750000	5.8	38	256 qam	18
7	282750000	6	38	256 qam	19
8	290750000	6	38	256 qam	20
9	298750000	6.5	38	256 qam	21
10	306750000	6.3	38	256 qam	22
11	314750000	6.4	38	256 qam	23
12	322750000	6.4	38	256 qam	24
13	330750000	6.5	38	256 qam	25
14	338750000	6.6	38	256 qam	26
15	346750000	6.5	38	256 qam	27
16	354750000	6.5	38	256 qam	28
17	362750000	6.5	38	256 qam	29
18	370750000	6.5	38	256 qam	30
19	378750000	6.6	38	256 qam	31
20	386750000	6.5	38	256 qam	32
21	394750000	6.6	38	256 qam	34
22	402750000	6.5	38	256 qam	35
23	410750000	6.8	38	256 qam	36
24	418750000	6.5	38	256 qam	37

Downstream bonded channels

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

1	Locked	38.6	5	0
2	Locked	38.6	0	0
3	Locked	38.9	0	0
4	Locked	38.9	0	0
5	Locked	38.6	5	0
6	Locked	38.6	0	0
7	Locked	38.9	5	0
8	Locked	38.6	4	0
9	Locked	38.9	6	0
10	Locked	38.9	6	0
11	Locked	38.9	0	0
12	Locked	38.6	0	0
13	Locked	38.9	0	0
14	Locked	38.9	5	0
15	Locked	38.6	2	0
16	Locked	38.9	0	0
17	Locked	38.9	5	0
18	Locked	38.9	5	0
19	Locked	38.9	5	0
20	Locked	38.6	0	0
21	Locked	38.6	5	0
22	Locked	38.6	0	0
23	Locked	38.6	6	0
24	Locked	38.6	6	0

[Anonymous]

Time will tell if the issue is fixed.
Will pop back tomorrow.

[Anonymous]

Well this is rather strange it just dropped.
Yet reconnected straight away.
At 00:08 almost one minute later it reconnected.
Incidentally the modem isn't showing anything in the log.

When I logged into the modem, it came back.
So bad firmware perhaps or main line issue?
Who knows, have a stronger attenuator on the way.
I figure once we get it stable during cold months.

Should be fine all year round.
Fingers crossed.

[Anonymous]

Gone back to the 6db attenuator.
I don't trust the thing.
Middle isn't straight at all.
These are the new downstream values.

[Anonymous]

Downstream bonded channels

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

1	234750000	2.5	38	256 qam	13
2	242750000	2.5	38	256 qam	14
3	250750000	2.7	38	256 qam	15
4	258750000	2.7	38	256 qam	16
5	266750000	3	38	256 qam	17
6	274750000	3	38	256 qam	18
7	282750000	3.2	38	256 qam	19
8	290750000	3.4	38	256 qam	20
9	298750000	3.7	38	256 qam	21
10	306750000	3.5	38	256 qam	22
11	314750000	3.7	38	256 qam	23
12	322750000	3.5	38	256 qam	24
13	330750000	3.7	38	256 qam	25
14	338750000	3.9	38	256 qam	26
15	346750000	3.7	38	256 qam	27
16	354750000	3.5	38	256 qam	28
17	362750000	3.7	38	256 qam	29
18	370750000	3.7	38	256 qam	30
19	378750000	3.9	38	256 qam	31
20	386750000	3.7	38	256 qam	32
21	394750000	3.9	38	256 qam	34
22	402750000	3.7	38	256 qam	35
23	410750000	4	38	256 qam	36
24	418750000	3.7	38	256 qam	37

[Anonymous]

Just for the hell of it.
Removed the attenuator to see how the levels would behave.
Surprisingly without any attenuator the upstream looks more stable.