Disconnections - No Ranging Response received - T3 time-out

[LFletcher]

My connection has been stable for years, but a few weeks ago it dropped our for several days. I rebooted and reset but that didn't fix it. Had an engineer booked, but the night before it came back online, so cancelled the visit. 

It has now started playing up again. Went offline again today for about 30 minutes off and on. 

In the network log are a number of T3 time-outs. 

Network Log

Time Priority Description

27/01/2022 15:33:53	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:19:2	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:19:1	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:18:55	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:08:46	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:08:44	critical	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 15:08:44	critical	Ranging Request Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:27:41	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:27:12	critical	REG RSP not received;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:27:12	Error	T6 Timeout and retries exceeded;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:27:12	critical	Registration RSP rejected unspecified reason;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:27:12	critical	Registration RSP rejected message syntax error;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:26:53	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:26:23	critical	REG RSP not received;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:26:23	Error	T6 Timeout and retries exceeded;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:26:22	critical	Registration RSP rejected unspecified reason;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:26:22	critical	Registration RSP rejected message syntax error;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 14:25:12	critical	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 13:52:0	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/01/2022 13:49:54	critical	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

Reading other posts with similar errors I believe the downstream power levels should be between -6 and +10 - which the majority of mine are outside of. 

I believe the upstream modulation should ideally be on 64 qam, which again mine isn't.

Upstream and downstream stats are in the next post.

I assume this requires an engineers visit to fix?

Is the best way to get one for this issue via the forum?

Thanks

[LFletcher]

Downstream bonded channels

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

1	371000000	-7	37	256 qam	30
2	203000000	-5.2	37	256 qam	9
3	211000000	-6.2	37	256 qam	10
4	219000000	-6	37	256 qam	11
5	227000000	-6.5	37	256 qam	12
6	235000000	-7	37	256 qam	13
7	243000000	-7.2	37	256 qam	14
8	251000000	-7.9	37	256 qam	15
9	259000000	-9.2	36	256 qam	16
10	267000000	-9.5	36	256 qam	17
11	275000000	-8.5	36	256 qam	18
12	283000000	-7.7	37	256 qam	19
13	291000000	-7.4	37	256 qam	20
14	299000000	-7.2	37	256 qam	21
15	307000000	-7	37	256 qam	22
16	315000000	-6.9	37	256 qam	23
17	323000000	-6.9	37	256 qam	24
18	331000000	-6.5	37	256 qam	25
19	339000000	-6.5	37	256 qam	26
20	347000000	-6.7	37	256 qam	27
21	355000000	-6.5	37	256 qam	28
22	363000000	-7	37	256 qam	29
23	379000000	-6.5	37	256 qam	31
24	387000000	-6.7	37	256 qam	32

Downstream bonded channels

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

1	Locked	36.3	65	0
2	Locked	36.6	11	0
3	Locked	36.6	23	0
4	Locked	36.3	26	0
5	Locked	36.3	32	0
6	Locked	36.3	13	0
7	Locked	35.7	25	0
8	Locked	35.7	50	0
9	Locked	35	352	0
10	Locked	35	452	0
11	Locked	35.5	155	0
12	Locked	36.3	20	0
13	Locked	36.6	11	0
14	Locked	36.3	12	0
15	Locked	36.6	9	0
16	Locked	36.6	27	0
17	Locked	36.6	19	0
18	Locked	36.6	23	0
19	Locked	36.6	25	0
20	Locked	36.6	10	0
21	Locked	36.6	9	0
22	Locked	36.6	7	0
23	Locked	36.3	11	0
24	Locked	36.6	15	0

Upstream bonded channels

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

1

25800000

52.2

5120

16 qam

6

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1

ATDMA

0

0

1

0

[jbrennand]

Its dreadful - needs the Tech back to correct it.

Your down power levels are all too low and you only have 1 Up channel instead of 4 and it is struggling.

Switch it off and unplug it for 5 minutes and see if the other 3 Up channels nmagically appear and stabilise things - unlikely the down powers will improve though

[LFletcher]

Restarted it this morning and here are the updated numbers. 

Downstream bonded channels

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

1	203000000	4.8	37	256 qam	9
2	211000000	4.5	36	256 qam	10
3	219000000	3.9	36	256 qam	11
4	227000000	3.5	36	256 qam	12
5	235000000	3.2	36	256 qam	13
6	243000000	2.9	36	256 qam	14
7	251000000	2	36	256 qam	15
8	259000000	1.2	35	256 qam	16
9	267000000	0.4	35	256 qam	17
10	275000000	1.5	36	256 qam	18
11	283000000	2.2	36	256 qam	19
12	291000000	2.7	37	256 qam	20
13	299000000	2.7	36	256 qam	21
14	307000000	3	37	256 qam	22
15	315000000	3	37	256 qam	23
16	323000000	3	37	256 qam	24
17	331000000	3.4	37	256 qam	25
18	339000000	3.2	37	256 qam	26
19	347000000	3.5	37	256 qam	27
20	355000000	3.2	37	256 qam	28
21	363000000	3.2	37	256 qam	29
22	371000000	3.2	37	256 qam	30
23	379000000	3.5	37	256 qam	31
24	387000000	3.5	38	256 qam	32

Downstream bonded channels

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

1	Locked	37.3	4	0
2	Locked	36.3	4	0
3	Locked	36.6	4	0
4	Locked	36.6	0	0
5	Locked	36.6	4	0
6	Locked	36.3	0	0
7	Locked	36.3	0	0
8	Locked	35.5	0	0
9	Locked	35.5	0	0
10	Locked	36.6	11	0
11	Locked	36.3	3	0
12	Locked	37.3	6	0
13	Locked	36.3	5	0
14	Locked	37.3	6	0
15	Locked	37.3	0	0
16	Locked	37.3	4	0
17	Locked	37.3	0	0
18	Locked	37.3	6	0
19	Locked	37.6	5	0
20	Locked	37.6	5	0
21	Locked	37.6	5	0
22	Locked	37.6	5	0
23	Locked	37.6	5	0
24	Locked	38.9	0	0

Upstream bonded channels

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

1	39400000	37.5	5120	64 qam	4
2	46200000	38.3	5120	64 qam	3
3	60300000	40.3	5120	64 qam	1
4	53700000	39.3	5120	64 qam	2

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

[jbrennand]

All stats are spot on now - any issues on the connection now ?

[LFletcher]

I have been around much today, so can't say for certain if there have been any more issues. 

There have been a few errors in the logs (I rebooted it at about 10:20) and the downstream power levels appear to have dropped across the board.

Is it normal behavior for the power to fluctuate like this and are the new errors anything to worry about? 

Network Log

Time Priority Description

28/01/2022 13:06:21	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 13:06:21	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 13:06:20	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 10:18:25	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

Downstream bonded channels

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

1	203000000	3.7	36	256 qam	9
2	211000000	3.2	36	256 qam	10
3	219000000	2.9	36	256 qam	11
4	227000000	2.2	35	256 qam	12
5	235000000	1.7	35	256 qam	13
6	243000000	1.7	35	256 qam	14
7	251000000	0.2	35	256 qam	15
8	259000000	-0.5	34	256 qam	16
9	267000000	-1.2	34	256 qam	17
10	275000000	-0.2	35	256 qam	18
11	283000000	0.5	35	256 qam	19
12	291000000	0.7	36	256 qam	20
13	299000000	0.7	35	256 qam	21
14	307000000	0.9	36	256 qam	22
15	315000000	0.7	36	256 qam	23
16	323000000	0.7	36	256 qam	24
17	331000000	1	36	256 qam	25
18	339000000	0.7	36	256 qam	26
19	347000000	1	36	256 qam	27
20	355000000	0.7	36	256 qam	28
21	363000000	0.5	36	256 qam	29
22	371000000	0.5	36	256 qam	30
23	379000000	0.7	36	256 qam	31
24	387000000	0.5	37	256 qam	32

Downstream bonded channels

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

1	Locked	36.6	182	1072
2	Locked	36.3	192	1627
3	Locked	36.3	268	1535
4	Locked	35.7	216	1631
5	Locked	35.7	227	1714
6	Locked	35.7	276	1330
7	Locked	35.5	356	1736
8	Locked	34.9	4144	1988
9	Locked	34.9	3879	1346
10	Locked	35.5	599	1804
11	Locked	35.7	185	1562
12	Locked	36.3	137	1798
13	Locked	35.5	170	1505
14	Locked	36.3	191	1492
15	Locked	36.6	145	1984
16	Locked	36.6	169	1800
17	Locked	36.6	191	1858
18	Locked	36.6	165	2077
19	Locked	36.6	159	1746
20	Locked	36.6	126	1877
21	Locked	36.6	128	2016
22	Locked	36.6	113	1984
23	Locked	36.6	147	2074
24	Locked	37.6	118	2131

[LFletcher]

I haven't been in much today, so I don't know if there have been any issues. 

I can see that there are a few errors in the logs since I rebooted it (around 10:20) and that the downstream power has dropped across the board. 

Are the errors anything to worry about and is it normal for the power levels to fluctuate so much? 

Network Log

Time Priority Description

28/01/2022 13:06:21	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 13:06:21	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 13:06:20	Warning!	RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/01/2022 10:18:25	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

Downstream bonded channels

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

1	203000000	3.5	36	256 qam	9
2	211000000	3.2	36	256 qam	10
3	219000000	2.7	36	256 qam	11
4	227000000	2.2	35	256 qam	12
5	235000000	1.7	35	256 qam	13
6	243000000	1.5	35	256 qam	14
7	251000000	0.2	35	256 qam	15
8	259000000	-0.7	34	256 qam	16
9	267000000	-1.2	34	256 qam	17
10	275000000	-0.2	35	256 qam	18
11	283000000	0.2	35	256 qam	19
12	291000000	0.7	36	256 qam	20
13	299000000	0.5	35	256 qam	21
14	307000000	0.7	36	256 qam	22
15	315000000	0.7	36	256 qam	23
16	323000000	0.7	36	256 qam	24
17	331000000	1	36	256 qam	25
18	339000000	0.7	36	256 qam	26
19	347000000	1	36	256 qam	27
20	355000000	0.7	36	256 qam	28
21	363000000	0.4	36	256 qam	29
22	371000000	0.5	36	256 qam	30
23	379000000	0.7	36	256 qam	31
24	387000000	0.5	37	256 qam	32

Downstream bonded channels

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

1	Locked	36.6	182	1072
2	Locked	36.3	192	1627
3	Locked	36.3	268	1535
4	Locked	35.7	216	1631
5	Locked	35.7	227	1714
6	Locked	35.7	276	1330
7	Locked	35.5	356	1736
8	Locked	34.9	4144	1988
9	Locked	34.9	3879	1346
10	Locked	35.5	599	1804
11	Locked	35.7	185	1562
12	Locked	36.3	137	1798
13	Locked	35.5	170	1505
14	Locked	36.3	191	1492
15	Locked	36.6	145	1984
16	Locked	36.6	169	1800
17	Locked	36.6	191	1858
18	Locked	36.6	165	2077
19	Locked	36.6	159	1746
20	Locked	36.6	126	1877
21	Locked	36.6	128	2016
22	Locked	36.6	113	1984
23	Locked	36.6	147	2074
24	Locked	37.6	118	2131

[gary_dexter]

You still have a noisy unstable line. Defo needs a tech back 

[LFletcher]

Thanks for the response. Whats the best way to get a technician booked for an issue like this - ring them up or via the forum? 

[jbrennand]

Call in - but also a VM person should pick this up when they get here- I will flag for them to take a look