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Greenpalmer
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Always One Channel High SNR

I always seem to have one downstream channel with high noise - it's always either channel 4 or channel 12 with a bit of overspill into adjacent channels.

Every time I reboot the router within a very short time channel 4 or 12 goes down to 33.

Also I often get only 16 or 32 qam on upsteam channels instead of the regular 64.

Router stats and log follow:

Downstream bonded channels

Channel

Frequency (Hz)

Power (dBmV)

SNR (dB)

Modulation

Channel ID

1

203000000

4.3

37

256 qam

9

2

139000000

6.8

37

256 qam

1

3

147000000

6

37

256 qam

2

4

155000000

6

37

256 qam

3

5

163000000

5.5

37

256 qam

4

6

171000000

5.5

37

256 qam

5

7

179000000

5

37

256 qam

6

8

187000000

5

37

256 qam

7

9

195000000

4.6

37

256 qam

8

10

211000000

4.1

37

256 qam

10

11

219000000

3.7

34

256 qam

11

12

227000000

3.7

33

256 qam

12

13

235000000

3.2

37

256 qam

13

14

243000000

3.2

37

256 qam

14

15

251000000

2.9

37

256 qam

15

16

259000000

3

37

256 qam

16

17

267000000

2.7

37

256 qam

17

18

275000000

2.4

37

256 qam

18

19

283000000

1.9

37

256 qam

19

20

291000000

1.2

37

256 qam

20

21

299000000

1.2

36

256 qam

21

22

307000000

1.9

37

256 qam

22

23

315000000

2.5

37

256 qam

23

24

323000000

2.9

37

256 qam

24




Downstream bonded channels

Channel

Locked Status

RxMER (dB)

Pre RS Errors

Post RS Errors

1

Locked

37.3

1449

648

2

Locked

37.3

2452

542

3

Locked

37.3

1108

572

4

Locked

37.6

1346

12888

5

Locked

37.6

997

1002

6

Locked

37.6

1249

963

7

Locked

37.3

1103

1049

8

Locked

37.3

917

823

9

Locked

37.3

773

833

10

Locked

37.6

818

699

11

Locked

34.3

1145020

563

12

Locked

33.9

4226461

848

13

Locked

37.3

1209

490

14

Locked

37.3

700

421

15

Locked

37.3

744

515

16

Locked

37.3

1357

503

17

Locked

37.6

918

533

18

Locked

37.6

937

480

19

Locked

37.6

1059

608

20

Locked

37.3

1782

550

21

Locked

36.6

1968

560

22

Locked

37.3

1079

764

23

Locked

37.6

1409

710

24

Locked

37.6

712

742

 

Upstream bonded channels

Channel

Frequency (Hz)

Power (dBmV)

Symbol Rate (ksps)

Modulation

Channel ID

1

39400053

48

5120

64 qam

4

2

53700200

49

5120

32 qam

2

3

46199912

48.5

5120

16 qam

3

4

60300010

49.3

5120

64 qam

1




Upstream bonded channels

Channel

Channel Type

T1 Timeouts

T2 Timeouts

T3 Timeouts

T4 Timeouts

1

ATDMA

0

0

4

0

2

ATDMA

0

0

3

0

3

ATDMA

0

0

5

0

4

ATDMA

0

0

1

0

 

Network Log

Time

Priority

Description

21/08/2021 07:43:22

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

21/08/2021 02:01:4

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

19/08/2021 15:24:48

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

19/08/2021 09:40:48

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

17/08/2021 14:59:32

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

17/08/2021 14:01:4

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

15/08/2021 17:06:21

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

15/08/2021 07:10:48

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

14/08/2021 21:04:55

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

14/08/2021 02:01:4

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

12/08/2021 00:11:28

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

11/08/2021 17:48:2

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

11/08/2021 13:16:11

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

11/08/2021 11:51:52

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

10/08/2021 16:50:40

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

10/08/2021 14:01:3

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

09/08/2021 05:07:48

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

08/08/2021 00:53:34

notice

LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

07/08/2021 02:01:3

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

06/08/2021 16:13:24

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

 

 

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Andrew-G
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Message 2 of 35
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Re: Always One Channel High SNR

Looks like you've got some upstream noise issues, and downstream is particularly affected by noise ingress of signals in the 220-230 MHz range.  The downstream issues are probably due to DAB radio broadcasts.  Assuming you haven't got any DIY coax modifications, then it's possibly a damaged cable or poor joint, or it could be a poorly fastened coax connector on the lead between the hub and the wall box.  

Have you checked that the coax cable is undamaged (and unkinked) and the connections are secure with the securing nuts done up finger tight?

If that's been done, then you'll need a technician visit, and in that case wait for the helpful forum staff to advise as the telephone agents won't have clue what you're talking about.

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Greenpalmer
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Message 3 of 35
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Re: Always One Channel High SNR

@Andrew-G, thanks for the reply.

I have checked the coax cable and connections and they all seem fine so I guess, as you say, that I need a technician visit.

Forum staff - please can you arrange.

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David_Bn
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Message 4 of 35
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Re: Always One Channel High SNR

Good Afternoon @Greenpalmer and I'm sorry to hear of the issues you've been experiencing with our services.

 

I've been able to locate your account and it appears that you're currently subjected to an area outage that is due to run until 09:15 on 31/08

 

We apologise for the inconvenience this may cause and our team will do all that's possible to have this resolved as soon as possible 

 

Kindest regards,

David_Bn

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Greenpalmer
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Message 5 of 35
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Re: Always One Channel High SNR

Hi David, thanks for the response.

I've looked on the Service Status page on My Virgin Media and there are no issues listed, and everything seems to be working reasonably normally so it doesn't seem that we do have an area outage.

 

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newapollo
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Message 6 of 35
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Re: Always One Channel High SNR

Hi Greenpalmer,

The issue may be listed on the  Service Status number  0800 561 0061.  This often gives details of more local issues down to postcode level.

Dave

The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali


I don't work for Virgin Media.

I'm a Very Insightful Person, I'm here to share knowledge. Learn more

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Greenpalmer
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Message 7 of 35
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Re: Always One Channel High SNR

Hi newapollo,

Thanks for that information.

I phoned the number you gave and the recorded message told me that there is indeed a very complex problem in my area that Virgin engineers are working very hard to fix and it may take longer than normal.

 

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Gareth_L
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Message 8 of 35
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Re: Always One Channel High SNR

Hello Greenpalmer

Sorry for the issues in your area

I have had a look into this and were are expecting this to be fixed around the 31/08/21

If it's still the same dater that date pop back on hare and ask for an update on the below reference number F009235929  

Gareth_L

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Greenpalmer
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Message 9 of 35
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Re: Always One Channel High SNR

Hi Gareth,

It's September 2nd now - can I have an update please

 

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John_GS
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Message 10 of 35
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Re: Always One Channel High SNR

Hi Greenpalmer

 

Thanks for coming back to us. Unfortunately from checking this, the SNR (signal to noise ratio) issue has been extended to the 9th September.

 

Kind regards,

John_GS
Forum Team


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