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lemmingzappa
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Gig1 Power Levels and SNR

Hi, please could you tell me if my downstream & upstream levels are within range for VM Gig1 (Gigabit). There's no attenuator attached to the rear of our Hub 4. Very recently there have been some latency issues, but no errors in the logs:

3.0 Downstream channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
25 330750000 13.6 39 QAM256 25
1 138750000 15.1 39 QAM256 1
2 146750000 15.1 38.6 QAM256 2
3 154750000 15.1 39 QAM256 3
4 162750000 14.8 39 QAM256 4
5 170750000 14.5 39 QAM256 5
6 178750000 14.3 39 QAM256 6
7 186750000 14.5 38.6 QAM256 7
8 194750000 14.2 39 QAM256 8
9 202750000 14.1 40.4 QAM256 9
10 210750000 14.1 39 QAM256 10
11 218750000 14.2 39 QAM256 11
12 226750000 14.1 40.4 QAM256 12
13 234750000 14.2 39 QAM256 13
14 242750000 14.4 40.4 QAM256 14
15 250750000 14.3 39 QAM256 15
16 258750000 14.4 39 QAM256 16
17 266750000 14.6 40.4 QAM256 17
18 274750000 14.7 40.4 QAM256 18
19 282750000 14.8 40.4 QAM256 19
20 290750000 14.7 40.4 QAM256 20
21 298750000 14.4 40.4 QAM256 21
22 306750000 13.7 38.6 QAM256 22
23 314750000 13.4 39 QAM256 23
24 322750000 13.5 40.4 QAM256 24
26 338750000 13.5 40.4 QAM256 26
27 346750000 13.3 39 QAM256 27
28 354750000 13.5 40.4 QAM256 28
29 362750000 13.1 40.4 QAM256 29
30 370750000 13.4 40.4 QAM256 30
31 378750000 13.7 40.4 QAM256 31
32 386750000 13.6 40.4 QAM256 32


3.0 Downstream channels
Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors
25 Locked 38.983261 0 0
1 Locked 38.983261 0 0
2 Locked 38.605377 0 0
3 Locked 38.983261 0 0
4 Locked 38.983261 0 0
5 Locked 38.983261 0 0
6 Locked 38.983261 0 0
7 Locked 38.605377 0 0
8 Locked 38.983261 0 0
9 Locked 40.366287 0 0
10 Locked 38.983261 0 0
11 Locked 38.983261 0 0
12 Locked 40.366287 0 0
13 Locked 38.983261 0 0
14 Locked 40.366287 0 0
15 Locked 38.983261 0 0
16 Locked 38.983261 0 0
17 Locked 40.366287 8 0
18 Locked 40.366287 0 0
19 Locked 40.366287 0 0
20 Locked 40.366287 0 0
21 Locked 40.366287 0 0
22 Locked 38.605377 0 0
23 Locked 38.983261 0 0
24 Locked 40.366287 0 0
26 Locked 40.366287 0 0
27 Locked 38.983261 0 0
28 Locked 40.366287 0 0
29 Locked 40.366287 0 0
30 Locked 40.366287 0 0
31 Locked 40.366287 0 0
32 Locked 40.366287 0 0

3.0 Upstream channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 46200000 38.8 5120 KSym/sec 64QAM 1
2 25800000 37.3 5120 KSym/sec 64QAM 4
3 32600000 37.8 5120 KSym/sec 64QAM 3
4 39400000 38.5 5120 KSym/sec 64QAM 2


3.0 Upstream channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 US_TYPE_STDMA 0 0 0 0
2 US_TYPE_STDMA 0 0 0 0
3 US_TYPE_STDMA 0 0 0 0
4 US_TYPE_STDMA 0 0 0 0

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jem101
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Message 2 of 12
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Re: Gig1 Power Levels and SNR

They are a bit on the high side, yes. The downstream power levels that is.

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lemmingzappa
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Re: Gig1 Power Levels and SNR

Thanks for the quick reply. Will a member of staff attend to this issue within this thread or do I have to call support?

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jbrennand
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Message 4 of 12
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Re: Gig1 Power Levels and SNR

Call first but a VM person will respond here in a day or two. Are you actually having any practical issues or are you just observing high latency on a speedtest or a BQM?

--------------------
John
--------------------

I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.
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lemmingzappa
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Re: Gig1 Power Levels and SNR

Had a few issues over the last few days with unusual latency when playing games and some intermittent DNS resolution problems (can’t confirm if using a third-party DNS provider would have fixed the problem as the issue is not currently present). All hard wired via ethernet.

Service has been pretty flawless for the last 10 years but I’ve started to notice more quirky problems since upgrading to Gigabit and the Hub 4.

Not having any issues as we speak and speed tests generally show expected speeds, but I’m not confident in the setup after seeing the power levels.

 

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John_GS
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Message 6 of 12
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Re: Gig1 Power Levels and SNR

Hi lemmingzappa

 

Thanks for posting and welcome to the community. 

 

My apologies for any prior issues - I've noted you've said in the last post everything has been fixed. 

 

I've checked the system today and all your levels are fine. No issues showing at all, SNR and congestion all in spec.

 

Can you go round all equipment for me, making sure all cables are finger tight connected. Also set up and run a BQM post it here so we can look at this also. 

 

Best,

 

 

 

John_GS
Forum Team


Need a helpful hand to show you how to make a payment? Check out our guide - How to pay my Virgin Media bill

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lemmingzappa
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Message 7 of 12
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Re: Gig1 Power Levels and SNR

Hi John, genuinely curious as to how you checked my service as I haven’t provided any account details. If it’s traced by IP at the time of posting I could have been anywhere.

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jem101
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Message 8 of 12
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Re: Gig1 Power Levels and SNR

@lemmingzappa if you have signed up for this forum using a VM email address (and assuming that said address is properly tied to your broadband account) then the forum team will have access to that information and hence will know your account number, MAC address and current IP address of your hub.

Knowing the Hub details will enable them to remotely interrogate it and check it’s status. The hub wouldn’t work if it were anywhere else other than the registered address.

Nothing whatsoever to do with where you happen to be posting from.

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lemmingzappa
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Message 9 of 12
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Re: Gig1 Power Levels and SNR

I’ve signed up with a completely unrelated email address which is why I’m confused, so far this account has no ties to my Virgin account in any way.

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Steven_L
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Message 10 of 12
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Re: Gig1 Power Levels and SNR

Thanks for coming back to us @lemmingzappa.

 

We are able to find your account via the ip address that you used when you last visited the forums, which in turn lets us know the MAC address. This information is only available to Virgin Media employees not any other forum members.

 

 

Regards,

Steven_L

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