Cable Forum

Cable Forum (https://www.cableforum.uk/board/index.php)
-   Virgin Media Installation Issues (https://www.cableforum.uk/board/forumdisplay.php?f=62)
-   -   Superhub install tomorrow (https://www.cableforum.uk/board/showthread.php?t=33686167)

Kymmy 08-03-2012 17:27

Superhub install tomorrow
 
As the search will bring up 1000's of threads can anyone give me a quick tolerance range for up/down power levels and also SNR ranges for the superhub as I'm getting 50Mb installed tomorrow. Just want to be able to check the levels before the engineer leaves

Thanks in advance

qasdfdsaq 08-03-2012 17:49

Re: Superhub install tomorrow
 
It's the engineer's job to check the levels, but for reference the recommended range is:

-7 to +7dB downstream and the closer to zero the better
At least 35dB SNR
35-55dB upstream.

Kymmy 08-03-2012 18:01

Re: Superhub install tomorrow
 
Thank you Qasi :kiss:

Currently on my old 2050 modem I get

Upstream 38.0 dBmV
Downstream 5.8 dBmV
SNR 41.0 dB

judgey 08-03-2012 19:03

Re: Superhub install tomorrow
 
ive been told

-5 to +5
and 40-50 Upstream

jb66 08-03-2012 19:18

Re: Superhub install tomorrow
 
Optimum is -3 to +7

Upstream 35 to 55

Your signals are perfect, I wouldn't waste an attenuator on that

qasdfdsaq 08-03-2012 19:36

Re: Superhub install tomorrow
 
Pah they did some stuff in Edinburgh that dropped my downstream levels from -3 to -8. Had a 15dB FPA on and can't find my 10, so my choices now are -8 with the attenuator or +12 without it. Urgh.

thenry 08-03-2012 19:41

Re: Superhub install tomorrow
 
so unfair I missed this thread..

Quote:

Originally Posted by Kymmy (Post 35395734)
Thank you Qasi :kiss:

yeah thanks Qasi :fit:

Kymmy 08-03-2012 19:52

Re: Superhub install tomorrow
 
My only worry is that I want the 2050 leaving on as well for the next 45 days, will this effect the signal much having two on the same cable? For reference it'll be the only two devices as I don't bother with TV

thenry 08-03-2012 19:56

Re: Superhub install tomorrow
 
whats a 2050

Kymmy 08-03-2012 19:58

Re: Superhub install tomorrow
 
Modem, a bit like a 250 but with more memory and NAT capability

jb66 08-03-2012 20:29

Re: Superhub install tomorrow
 
Quote:

Originally Posted by qasdfdsaq (Post 35395817)
Pah they did some stuff in Edinburgh that dropped my downstream levels from -3 to -8. Had a 15dB FPA on and can't find my 10, so my choices now are -8 with the attenuator or +12 without it. Urgh.

LOL, -8 + 15 = 7 Take it off


Edinburgh is split with many types of architecture, has your upstream changed

qasdfdsaq 08-03-2012 22:48

Re: Superhub install tomorrow
 
Quote:

Originally Posted by jb66 (Post 35395852)
LOL, -8 + 15 = 7 Take it off


Edinburgh is split with many types of architecture, has your upstream changed

Yeah but the FPA is weird - I took it off and it went to +12.

Yeah, my upstream changed, but not until a few weeks after my downstream did.

Kymmy 09-03-2012 09:44

Re: Superhub install tomorrow
 
Engineers been, levels are (with 8 downstream channels running)
Quote:

Downstream Channels
Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis locked
Locked QAM256 32 55616000 Kbits/sec 323000000 Hz 6.7 dBmV 42.4 dB Hybrid
Locked QAM256 25 55616000 Kbits/sec 267000000 Hz 7.7 dBmV 43.2 dB Hybrid
Locked QAM256 26 55616000 Kbits/sec 275000000 Hz 7.7 dBmV 43.6 dB Hybrid
Locked QAM256 27 55616000 Kbits/sec 283000000 Hz 7.3 dBmV 43.2 dB Hybrid
Locked QAM256 28 55616000 Kbits/sec 291000000 Hz 6.9 dBmV 42.9 dB Hybrid
Locked QAM256 29 55616000 Kbits/sec 299000000 Hz 8.3 dBmV 43.1 dB Hybrid
Locked QAM256 30 55616000 Kbits/sec 307000000 Hz 7.7 dBmV 43.2 dB Hybrid
Locked QAM256 31 55616000 Kbits/sec 315000000 Hz 7.4 dBmV 42.3 dB Hybrid
Upstream Channels
Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power
Locked ATDMA 2 20480 Kbits/sec 35800000 Hz 38.3 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
https://www.cableforum.co.uk/images/...2012/03/49.png

thenry 09-03-2012 10:32

Re: Superhub install tomorrow
 
Those down power levels could be a little lower.

8 down channels.. very nice. would you be willing to set up a ping monitor :D

Kymmy 09-03-2012 11:13

Re: Superhub install tomorrow
 
Already set one up, also the 10Mb virgin Media business modem's still attached so I can compare the two graphs

---------- Post added at 10:13 ---------- Previous post was at 09:40 ----------

Naughty engineer never left me a "Wireless N adaptor" Have used the "contact us" pages to see if I can get one


All times are GMT +1. The time now is 14:45.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.