Consistent intermittent dropouts for the past year

Question

An engineer came out to replace the router around a week ago, yet nothing has changed. I've replaced the coaxial cable since it seemed a little decrepit, again to no avail. I've looked at the router's upstream/downstream stats and they all seem to be within spec. of what I've seen from others' routers, besides the pre/post-RSS error count.

I'm genuinely just baffled at how/what/why the signal is so appalling. Whenever the internet does work I get around 300/10 Mbps. I'm not sure if it's placebo or what, but whenever I seem to do anything that could bring me happiness the Internet shuts down for about 5 minutes, if that helps.

(10-12pm is a power outage)

31-05-2024 20:51:57	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:::::;CMTS-MAC=:::::;CM-QOS=1.1;CM-VER=3.1;
31-05-2024 20:51:26	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:::::;CMTS-MAC=:::::;CM-QOS=1.1;CM-VER=3.1;
31-05-2024 20:50:57	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:::::;CMTS-MAC=:::::;CM-QOS=1.1;CM-VER=3.1;
31-05-2024 20:50:37	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:::::;CMTS-MAC=:::::;CM-QOS=1.1;CM-VER=3.1;
31-05-2024 20:20:16	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=3.1;
31-05-2024 20:17:00	critical	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=:::::;CMTS-MAC=:::::;CM-QOS=1.1;CM-VER=3.1;

3.0 Downstream channels

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

1	331000000	5.6	41	QAM 256	25
2	139000000	3.6	40	QAM 256	1
3	147000000	3.8	40	QAM 256	2
4	155000000	3.8	40	QAM 256	3
5	163000000	3.7	40	QAM 256	4
6	171000000	3.6	40	QAM 256	5
7	179000000	3.7	40	QAM 256	6
8	187000000	4.2	40	QAM 256	7
9	195000000	4.6	40	QAM 256	8
10	203000000	4.7	40	QAM 256	9
11	211000000	4.7	41	QAM 256	10
12	219000000	4.5	40	QAM 256	11
13	227000000	4.2	40	QAM 256	12
14	235000000	4.2	40	QAM 256	13
15	243000000	4.3	41	QAM 256	14
16	251000000	4.1	41	QAM 256	15
17	259000000	4	40	QAM 256	16
18	267000000	4.2	40	QAM 256	17
19	275000000	4.5	41	QAM 256	18
20	283000000	4.7	41	QAM 256	19
21	291000000	4.9	41	QAM 256	20
22	299000000	5.2	41	QAM 256	21
23	307000000	5.5	41	QAM 256	22
24	315000000	5.8	41	QAM 256	23
25	323000000	5.9	41	QAM 256	24
26	339000000	5.6	41	QAM 256	26
27	347000000	5.8	41	QAM 256	27
28	355000000	5.9	41	QAM 256	28
29	363000000	6.1	41	QAM 256	29
30	371000000	6.1	41	QAM 256	30
31	379000000	6	41	QAM 256	31
32	387000000	5.7	41	QAM 256	32

3.0 Downstream channels

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

1	Locked	41	616	1177
2	Locked	40	5002	25
3	Locked	40	615	307
4	Locked	40	586	1763
5	Locked	40	571	1511
6	Locked	40	508	1020
7	Locked	40	133	255
8	Locked	40	541	1475
9	Locked	40	248	636
10	Locked	40	24	0
11	Locked	41	162	523
12	Locked	40	108	192
13	Locked	40	466	741
14	Locked	40	145	509
15	Locked	41	127	390
16	Locked	41	601	1210
17	Locked	40	189	567
18	Locked	40	92	179
19	Locked	41	556	778
20	Locked	41	558	730
21	Locked	41	112	310
22	Locked	41	547	1032
23	Locked	41	180	480
24	Locked	41	17	38
25	Locked	41	20	87
26	Locked	41	10	44
27	Locked	41	12	43
28	Locked	41	25	55
29	Locked	41	93	155
30	Locked	41	78	175
31	Locked	41	90	147
32	Locked	41	76	166

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

159

94

4K

1840

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

159

Locked

43

6.5

6856234

3228

3.0 Upstream channels

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

0	49600000	47	5120	QAM 64	1
1	43100000	47.3	5120	QAM 64	2
2	36600000	47.3	5120	QAM 64	3
3	30100000	46.8	5120	QAM 64	4
4	23600000	46.8	5120	QAM 64	5

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	42
1	ATDMA	5
2	ATDMA	5
3	ATDMA	6
4	ATDMA	6

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

6

10

41.5

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

6

OFDMA

200

74000000

2

0

jbrennand · Answer

You replaced the co-ax cable! - with what ?

If you got some "VM compatible" cable from Amazon or similar - then my money is on that bit of tat cable being the main culprit - VM cable is different spec and no 3d party can supply it. Many examples on here (and in my daughters bedroom) whereby Amazon tat cables introduce "noise" into the whole system - which can also then affect your neighbours connections.

Put the cable that the Tech left with you back on - and see if it clears up after doing this...

... Switch the Hub off and unplug it from the mains supply for five minutes. Whilst it's off, do a quick check that all of your coax and ethernet cable connections are in nice and "finger" tight - at the Hub and wall box and also at any connectors etc. Ensure there are no “unterminated cable loose ends. Disconnect all the connections and reconnect to be sure. Also check that the internal wiring is ok with no kinking or chaffing. When its light, check that all looks good with the outside cabling and wall box (no “staples, etc.,) piercing the cables. Then switch the Hub back on and leave ~5 minutes When all done, check back in the settings and ensure that the RS error counts and T3 errors have all reset to 0. Then check every hour or so to see if they start reappearing - they shouldn't. If they do (particularly the postRS and T3 ones) you have a problem (noise) that only a Tech visit will sort.
Also check the Upstream QAM’s are all at 64

jbrennand · Answer

Has it improved with the old coax back on ?

unazed · Answer

Been monitoring it for 24h now with the old co-ax back on. It has been pretty much the same.

6pm is when I changed the cable, I didn't record any up/downstream stats, but as of now:

3.0 Downstream channels

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

1	331000000	5.6	41	QAM 256	25
2	139000000	3.9	40	QAM 256	1
3	147000000	4.1	40	QAM 256	2
4	155000000	4	40	QAM 256	3
5	163000000	3.8	40	QAM 256	4
6	171000000	4	40	QAM 256	5
7	179000000	4.2	40	QAM 256	6
8	187000000	4.5	40	QAM 256	7
9	195000000	4.8	40	QAM 256	8
10	203000000	4.8	40	QAM 256	9
11	211000000	5	41	QAM 256	10
12	219000000	4.9	41	QAM 256	11
13	227000000	4.6	41	QAM 256	12
14	235000000	4.4	40	QAM 256	13
15	243000000	4.3	41	QAM 256	14
16	251000000	4.2	41	QAM 256	15
17	259000000	4.2	41	QAM 256	16
18	267000000	4.5	41	QAM 256	17
19	275000000	4.7	41	QAM 256	18
20	283000000	5	41	QAM 256	19
21	291000000	5.3	41	QAM 256	20
22	299000000	5.7	41	QAM 256	21
23	307000000	5.8	41	QAM 256	22
24	315000000	5.7	41	QAM 256	23
25	323000000	5.6	41	QAM 256	24
26	339000000	6	41	QAM 256	26
27	347000000	6.3	41	QAM 256	27
28	355000000	6.2	41	QAM 256	28
29	363000000	6	41	QAM 256	29
30	371000000	5.8	41	QAM 256	30
31	379000000	5.8	41	QAM 256	31
32	387000000	5.8	41	QAM 256	32

3.0 Downstream channels

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

1	Locked	41	4269	10526
2	Locked	40	1905	492
3	Locked	40	108449	36778
4	Locked	40	46380	12215
5	Locked	40	18689	11471
6	Locked	40	146719	32933
7	Locked	40	87877	51906
8	Locked	40	29592	8605
9	Locked	40	3396	6169
10	Locked	40	337	1033
11	Locked	41	6738	11822
12	Locked	41	3602	7849
13	Locked	41	2655	5807
14	Locked	40	3144	6856
15	Locked	41	3109	6924
16	Locked	41	3638	7087
17	Locked	41	2153	4932
18	Locked	41	3328	7792
19	Locked	41	1220	3776
20	Locked	41	10728	13621
21	Locked	41	1368	2663
22	Locked	41	2006	4790
23	Locked	41	1802	3419
24	Locked	41	2207	5156
25	Locked	41	2323	6386
26	Locked	41	3017	5594
27	Locked	41	9463	11960
28	Locked	41	3738	7747
29	Locked	41	3908	9591
30	Locked	41	2918	4760
31	Locked	41	5201	7091
32	Locked	41	2626	3652

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

159

94

4K

1840

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

159

Locked

43

6.3

179672194

17929

3.0 Upstream channels

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

0	49600000	47.5	5120	QAM 64	1
1	43100000	47.5	5120	QAM 64	2
2	36600000	47	5120	QAM 64	3
3	30100000	46.5	5120	QAM 64	4
4	23600000	46.5	5120	QAM 64	5

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	43	17	1
1	ATDMA	43	19	0
2	ATDMA	43	18	1
3	ATDMA	43	19	4
4	ATDMA	43	31	2

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

6

10

41.5

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

6

OFDMA

200

74000000

0

Zach_R · Answer

Hi unazed,
 Thank you for your posts and welcome to our community forums. We're here to help.&nbsp;
 I'm very sorry to hear of your recent connection issues. Are these ongoing today? If so, would you mind expanding on the situation, specifically with the different coax cables you've mentioned? Are you saying you've installed some coax cables yourself?
 Thanks,
 &nbsp;

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Consistent intermittent dropouts for the past year

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