Are my downstream and upstream power levels within spec?

[oscarandjo]

I recently moved to a new house and decided to stay with Virgin Media as I was quite happy with it in my last place. In the new place I have found the connection to be quite frustrating, with pages sometimes loading indefinitely, and video calls being choppy and cutting out.

I wanted to try to triage as to whether this is a line issue or if I need to buy a new Wireless Access Point to improve range.

Are these downstream & upstream power levels within specification?

Downstream bonded channels

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

1	659000000	14	36	256 qam	32
2	475000000	14.6	38	256 qam	9
3	483000000	14.3	38	256 qam	10
4	491000000	13.9	38	256 qam	11
5	499000000	14.1	38	256 qam	12
6	507000000	13.8	38	256 qam	13
7	515000000	14	38	256 qam	14
8	523000000	13.5	38	256 qam	15
9	531000000	13.5	37	256 qam	16
10	539000000	13.4	37	256 qam	17
11	547000000	13.1	37	256 qam	18
12	555000000	13.3	38	256 qam	19
13	563000000	12.8	37	256 qam	20
14	571000000	13	37	256 qam	21
15	579000000	12.6	37	256 qam	22
16	587000000	13.3	37	256 qam	23
17	595000000	13	37	256 qam	24
18	603000000	13.5	37	256 qam	25
19	611000000	13.5	37	256 qam	26
20	619000000	13.6	37	256 qam	27
21	627000000	13.6	36	256 qam	28
22	635000000	13.3	36	256 qam	29
23	643000000	13.6	36	256 qam	30
24	651000000	13.3	36	256 qam	31

Downstream bonded channels

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

1	Locked	36.6	613	4437
2	Locked	38.9	176	4517
3	Locked	38.9	205	4584
4	Locked	38.6	171	4685
5	Locked	38.9	130	5354
6	Locked	38.6	164	7564
7	Locked	38.6	143	5589
8	Locked	38.6	211	4816
9	Locked	37.3	213	4894
10	Locked	37.3	288	4923
11	Locked	37.6	277	5480
12	Locked	38.6	287	5461
13	Locked	37.3	282	6570
14	Locked	37.3	408	5293
15	Locked	37.3	458	5224
16	Locked	37.6	437	5345
17	Locked	37.6	463	5128
18	Locked	37.6	486	4753
19	Locked	37.6	525	4634
20	Locked	37.3	577	4656
21	Locked	36.6	551	4669
22	Locked	36.6	922	13010
23	Locked	36.6	511	4538
24	Locked	36.6	644	4690

And upstream...

Upstream bonded channels

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

1	43100000	31.3	5120	64 qam	2
2	23600000	30	5120	32 qam	5
3	30100000	30.8	5120	64 qam	4
4	36600000	31	5120	64 qam	3
5	49600000	31.3	5120	64 qam	1

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	23	0
2	ATDMA	0	0	8	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	1	0
5	ATDMA	0	0	1	0

Thank you in advance!

[jbrennand]

Nope

The Down channels are all to high - +10dBmV is the recommended maximum.

The Up channels are all too low should be over 34 dBmV. And qam dropping to 32.

And too many PostRS and T3 errors.

It will need a Tech visit to adjust those to the correct levels - call it in as a fault or a VM person will respond here in a day or two.

[John_GS]

Hi oscarandjo

Thanks for posting and welcome back to the community.

Sorry to hear of the broadband issues.

I've done a system check and you are affected by an SNR (signal to noise ratio) issue.

Fault reference - F010167077 and the estimated fix date is the 14th October at 1.05pm. Please monitor the connection after this time and report back any issues.

Best,

[oscarandjo]

Thank you both for the informative replies! I will see if there’s an improvement after that repair is done. Is there any way I can subscribe to status update email/SMS for that issue reference?

Thanks once again!

[Tudor]

If you phone the number below you should be able to do that.

Check with Area faults on 0800 561 0061 If you have a VM landline 150 this goes down to post code level.

[John_GS]

You're more than welcome, do pop back if no change after the above date and we'll assist 

Kind regards,

[Sephiroth]

Just to say, make sure that the technician notices the power levels.  When they are that high, noise is amplified as well as signal.  That's in addition to the SNR issue identified by the VM responder - which the technician can do nothing about the SNR.

The attenuator you'll need should be 6 or 8 dB.

Keep us posted.

[oscarandjo]

The fault reference F010167077 seems to be fixed, but my internet is still quite poor. Do these power levels look like stuff is normal now? Or should I book a technician?

Downstream bonded channels

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

1	659000000	14.5	37	256 qam	32
2	475000000	14.9	38	256 qam	9
3	483000000	14.4	38	256 qam	10
4	491000000	14	38	256 qam	11
5	499000000	14.3	38	256 qam	12
6	507000000	14	38	256 qam	13
7	515000000	14.3	38	256 qam	14
8	523000000	13.9	38	256 qam	15
9	531000000	13.9	37	256 qam	16
10	539000000	13.6	37	256 qam	17
11	547000000	13.5	37	256 qam	18
12	555000000	13.6	38	256 qam	19
13	563000000	13.1	37	256 qam	20
14	571000000	13.5	37	256 qam	21
15	579000000	13.1	37	256 qam	22
16	587000000	13.8	37	256 qam	23
17	595000000	13.5	37	256 qam	24
18	603000000	13.9	37	256 qam	25
19	611000000	13.9	37	256 qam	26
20	619000000	14	37	256 qam	27
21	627000000	14	36	256 qam	28
22	635000000	13.6	36	256 qam	29
23	643000000	14	36	256 qam	30
24	651000000	13.6	36	256 qam	31

Downstream bonded channels

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

1	Locked	37.3	11551	30843
2	Locked	38.6	3833	37480
3	Locked	38.9	3965	30659
4	Locked	38.6	4155	22989
5	Locked	38.6	4240	31885
6	Locked	38.6	5037	35459
7	Locked	38.6	6943	41814
8	Locked	38.6	6440	39293
9	Locked	37.6	8166	49174
10	Locked	37.6	9283	48827
11	Locked	37.3	9487	49171
12	Locked	38.6	10852	49821
13	Locked	37.3	11082	44157
14	Locked	37.6	12797	47499
15	Locked	37.3	14305	42396
16	Locked	37.3	13421	46395
17	Locked	37.6	13660	45590
18	Locked	37.3	14186	45599
19	Locked	37.3	13800	43172
20	Locked	37.3	13642	42657
21	Locked	36.6	13462	35690
22	Locked	36.3	18945	40802
23	Locked	36.6	14563	31937
24	Locked	36.3	14906	30982

And upstream...

Upstream bonded channels

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

1	43100000	34.3	5120	64 qam	2
2	23600000	33.5	5120	32 qam	5
3	30100000	33.8	5120	64 qam	4
4	36600000	34	5120	64 qam	3
5	49600000	34.3	5120	64 qam	1

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	43	0
2	ATDMA	0	0	23	6
3	ATDMA	0	0	14	0
4	ATDMA	0	0	15	3
5	ATDMA	0	0	5	0

[carl_pearce]

No, still out of spec.

[Sephiroth]

Your downstream levels are to high and need attenuating. I guess you're very close to your street cabinet. A technician needs to move your cable to a higher attenuation tap point in the cabinet.

Your upstream channel 2 has noise, hence 32QAM, but that's sorted at the VM end and it should be working OK.