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BigFloppy
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Downstream Power Levels - One Channel Significantly Lower

Hi All,

So a week or two ago our broadband was down as they were performing upgrades in the area.

Seemed OK afterwards, slightly different power levels so had to move down to a 3db Forward Path Attenuator (from 6db) to keep the power levels within range.

But yesterday we had a small outage. Had to reboot superhub and after this the power levels jumped up on all channels apart from one. Have put the 6db FPA onto it but there is one channel that is significantly different to all others power wise and therefore getting Post RS errors.

What can be done about this? Does an engineer need to fix something or can it be done without a visit?

Below are current Downstream figures. Upstream appears to be OK.

Service is M600.

 

Downstream bonded channels

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

12270000002.736256 qam12
22190000002.736256 qam11
3235000000337256 qam13
42430000002.937256 qam14
52510000002.737256 qam15
62590000002.736256 qam16
72670000002.737256 qam17
82750000002.937256 qam18
92830000002.937256 qam19
102910000002.937256 qam20
112990000003.537256 qam21
123070000003.737256 qam22
133150000003.536256 qam23
14323000000235256 qam24
15331000000-4.734256 qam25
163710000003.937256 qam26
173790000003.737256 qam27
183870000003.737256 qam28
193950000003.737256 qam29
204030000003.737256 qam30
21411000000437256 qam31
224190000004.137256 qam32
234270000004.137256 qam33
24435000000437256 qam34



Downstream bonded channels

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

1Locked36.6640
2Locked36.6590
3Locked37.6680
4Locked37.3630
5Locked37.3500
6Locked36.6650
7Locked37.3380
8Locked37.3330
9Locked37.6330
10Locked37.3280
11Locked37.3610
12Locked37.3560
13Locked36.6730
14Locked35.71019974142
15Locked34.485967705957802
16Locked37.6290
17Locked37.3550
18Locked37.3390
19Locked37.3540
20Locked37.6520
21Locked37.3450
22Locked37.31080
23Locked37.6620
24Locked37.6450

 

Thanks in advance!

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Andrew-G
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Re: Downstream Power Levels - One Channel Significantly Lower

Looks like that will need a technician visit (unless associated with a known area fault).  Fiddling with the attenuator almost certainly won't help because you've got low power on a single channel.  I'll flag for staff to comment.

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

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Robert_P
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Re: Downstream Power Levels - One Channel Significantly Lower

Hello BigFloppy

 

Sorry to hear of the broadband issues experienced, we appreciate you taking the time to raise this via the forums and for providing all of the required details and information.

 

We can see the issue with the downstream power levels and can confirm this will need a technician's visit. I'm going to send you a Private Message just to confirm some details so I can get this arranged for you.

 

Looking forward to hearing back form you.

 

Rob

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Re: Downstream Power Levels - One Channel Significantly Lower

Thank you both.

I have just responded.

 

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Robert_P
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Re: Downstream Power Levels - One Channel Significantly Lower

Thanks BigFloppy, this is all in place for you, I have sent you the details via Private Message but you can also track it here

 

Rob

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Re: Downstream Power Levels - One Channel Significantly Lower

Just wanted to give feedback on how great the engineer/technician was.

He fixed the problem this morning and all channels are at good levels now.

Unfortunately, I had to rush out within a few minutes of him arriving due to a family emergency, so firstly I didn't get his name to send some feedback of how knowledgeable and polite he was, but he continued to investigate the problem and told my partner that he had changed some of the connectors over outside my property and at the cabinet.

When I got back, all is super!!

He also spotted that the power supply for my superhub was the incorrect one, so changed that over too.

Amazing service!

 

I know a feedback survey may come through on e-mail but maybe you can let me know the technicians name so that I can send a feedback e-mail 🙂

 

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Akua_A
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Re: Downstream Power Levels - One Channel Significantly Lower

Thank you for the feedback @BigFloppy.

 

We are glad our engineer was able to resolve this for you and that your service is running normally again.

 

We are currently unable to provide the name of the technician, however we can pass this feedback on to the relevant teams to be passed on to him.

 

Please do not hesitate to contact us if you need any further help.

 

Thanks,

Akua_A
Forum Team



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