Cable Modem Signal levels and errors

[CicadaEffect]

(Edit 1: replaced uploaded image with link)

Hi, please can someone check my signal levels and error counts are ok? 

Having frequent outages every other day.  We work at home and it's affecting us a lot.

Background

I have Hub v3 and it's set up in Cable Modem mode with a separate Wifi router.  I'm using cat cable and someone else is working on 5GHz wifi.

After complaining around 6 weeks back about outage frequency, around 4 weeks back, an engineer came out and put a 3db attenuator on our v3 Hub.

He said our downstream signal levels were too high because a combination of: 1) replacement of some faulty network infrastructure; and 2) our house being close to the street cabinet.

Ping Monitor (last 24h)

Cable Modem Data (today)

Downstream bonded channelsChannel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	138750000	6.6	37	256 qam	1
2	146750000	6.6	37	256 qam	2
3	154750000	6.6	37	256 qam	3
4	162750000	6.6	38	256 qam	4
5	170750000	6.6	38	256 qam	5
6	178750000	6.3	38	256 qam	6
7	186750000	6.1	38	256 qam	7
8	194750000	5.8	38	256 qam	8
9	202750000	5.4	38	256 qam	9
10	210750000	5.1	38	256 qam	10
11	218750000	5.1	38	256 qam	11
12	226750000	5	38	256 qam	12
13	234750000	4.8	38	256 qam	13
14	242750000	4.6	38	256 qam	14
15	250750000	4.5	38	256 qam	15
16	258750000	4.3	38	256 qam	16
17	266750000	4.5	38	256 qam	17
18	274750000	4.4	38	256 qam	18
19	282750000	4.6	38	256 qam	19
20	290750000	4.9	38	256 qam	20
21	298750000	5.3	38	256 qam	21
22	306750000	5.1	38	256 qam	22
23	314750000	5	38	256 qam	23
24	322750000	4.8	38	256 qam	24

Downstream bonded channelsChannel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	37.6	195278	31254
2	Locked	37.6	53054	29567
3	Locked	37.6	39802	28264
4	Locked	38.2	36687	25106
5	Locked	37.6	34361	23547
6	Locked	38.6	32500	21971
7	Locked	38.6	31103	19885
8	Locked	38.6	29724	18894
9	Locked	38.6	28525	18603
10	Locked	38.6	27286	16858
11	Locked	38.6	26209	15753
12	Locked	38.6	25146	14833
13	Locked	38.6	24141	14437
14	Locked	38.9	23277	13555
15	Locked	38.9	22380	13189
16	Locked	38.6	22123	12731
17	Locked	38.6	21360	12271
18	Locked	38.6	20696	11737
19	Locked	38.9	19794	11664
20	Locked	38.6	19090	10762
21	Locked	38.6	18337	10660
22	Locked	38.9	18392	10239
23	Locked	38.9	19041	9975
24	Locked	38.6	19697	9348

[lotharmat]

Power levels (downstream) look fine!

What are the upstream stats?

[CicadaEffect]

Thanks for the quick response! What are the expected power level ranges for upstream and downstream? 

Refresh data

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

1	39400000	39.3	5120	64 qam	6
2	46200000	39.3	5120	64 qam	5
3	32600000	39	5120	64 qam	7
4	25800117	39	5120	64 qam	8

Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	11	0
2	ATDMA	0	0	1	0
3	ATDMA	0	0	3	0
4	ATDMA	0	0	1	0

[lotharmat · Accepted solution]

Power levels look fine but the T3s indicate a problem! - As you have rebooted your hub recently, and these are new errors - VM need to look at this and resolve!

[CicadaEffect]

I guess something is going on...I hear this when calling 150:  "Right now we are improving our network so we can give you the best service possible. This mean you'll be experiencing a loss of your broadband and TV services in the <postcode> area, everything should be back to normal by 3pm"

Well, I guess wait and see what happens.

Thanks again for your fast feedback.

[lotharmat]

No worries! - Check the number again at 1500hrs - the work may be delayed!

Keep us posted - When the work is complete - the T3 timeouts should not be rising!

[CicadaEffect]

Good point.  Work appears to be complete - no message anymore on 150 for my area.

Rebooted around 4pm and 7h later, all upstream timeouts are all at zero.

Would you know of a tool that monitors the cable modem and checks the health status overtime? I'm sure VM have the tools in the back-end and I shouldn't have to do that as a consumer, though it's something that I'd be quite interested in monitoring.

Stability over past few months has been steadily deteriorating with regular outages.  I'll keep an eye on these figures next week if there's another disruption. 👍

[Richw1982]

Hi, you can try https://www.thinkbroadband.com/

[CicadaEffect]

Thanks, I already have a ThinkBroadband monitor. I was wondering if there is a health check that monitors Cable Modem signal levels, ranges and errors.

[Hayley_S]

Hello @CicadaEffect.

Welcome back to the community page, thank you for posting on here.

I can see you have been having errors with your cable modem signal is this correct? From what I can see on your last reply you have not been getting any more errors is that correct also?

Please let me know 🙂