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Standard User Grzyb
(member) Fri 22-Jul-16 13:44:27
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Forward Path Equaliser & Install Questions


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Hi All,

Had Virgin Media installed on Weds 20th, The Technician that Installed it, Has Said that it needs a 12db Forward Path Equaliser, but he only had a 4db one, so fitted that one instead...

He also put down on the Install Checklist that it needs "RG11 Refull to improve levels", Which I take to mean that the Cable Recently Installed from the Cabinet requires replacing?

He said that he would come yesterday to Change the 4db Equaliser, but no sign of it happening, I don't want to get the Guy into trouble, by calling the Virgin Helpline, but I may have no choice....

What issues can I expect with a 4db Equaliser as opposed to a 12db one & how do I go about getting the Cable replaced....To improve the Levels.....

Cheers.....

I have been given the White Hub 3.0, latest Router, where do I check for SNR Levels & what are the expected/Tolerance Levels that I should expect......
Standard User jb66
(committed) Fri 22-Jul-16 20:00:22
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Re: Forward Path Equaliser & Install Questions


[re: Grzyb] [link to this post]
 
The technician sounds a bit of a numpty, why would you tell a customer all this and not do anything about it?

You cant get a cable replaced, the technician has to organise it. Can you have a look into the hub by typing 192.168.0.1 and let us know what your upstream and downstream levels are?
Standard User Grzyb
(member) Fri 22-Jul-16 22:08:48
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Re: Forward Path Equaliser & Install Questions


[re: jb66] [link to this post]
 
In reply to a post by jb66:
The technician sounds a bit of a numpty, why would you tell a customer all this and not do anything about it?

You cant get a cable replaced, the technician has to organise it. Can you have a look into the hub by typing 192.168.0.1 and let us know what your upstream and downstream levels are?


I'm Currently @ Work on Nights, So Will Login in the Afternoon & Put Some Stats Up....Cheers


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Standard User Ignitionnet
(knowledge is power) Sat 23-Jul-16 13:25:19
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Re: Forward Path Equaliser & Install Questions


[re: jb66] [link to this post]
 
I'm interested in why a repull is needed but he wanted to use a 12dB FPE.

Assuming that a 12dB FPE was actually needed sounds more to me like the slope on the network needs checking out, not just this one punter needing a repull.

A repull is I thought needed when return path transmit is too high or receive power too low. That doesn't really fit with having the low end too hot.
Standard User Grzyb
(member) Sat 23-Jul-16 15:18:14
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Re: Forward Path Equaliser & Install Questions


[re: Grzyb] [link to this post]
 
Download


Channel Frequency(Hz) Power(dBmV) SNR(dB) Modulation Channel ID
1 298750000 -4.2 38.6 256 qam 21
2 322750000 -4 38.6 256 qam 24
3 314750000 -4 38.6 256 qam 23
4 306750000 -4.2 38.6 256 qam 22
5 290750000 -4.2 38.6 256 qam 20
6 282750000 -4.2 38.6 256 qam 19
7 274750000 -4.4 38.6 256 qam 18
8 266750000 -4.2 38.6 256 qam 17
9 258750000 -4.2 38.9 256 qam 16
10 250750000 -4.2 38.9 256 qam 15
11 242750000 -4.4 38.9 256 qam 14
12 234750000 -4.5 38.6 256 qam 13

Upload

Channel ID Frequency(Hz) Modulation Power(dBmV) Mode Channel Bandwidth(Hz) Symbol Rate (ksps)
43 32600000 ATDMA 40 16 qam 6400000 5120
41 46200000 ATDMA 41 16 qam 6400000 5120

Just been told by the Wife, that the Virgin Engineer came round yesterday evening, after I'd left for work & replaced the 4db Forward Path Equaliser with a 12db one, so the Stats that I have given above are with the 12db Forward Path Equaliser fitted....Women!!!!!!!!!!!

Below are the Figures that I were receiving when on the 4db Forward Path Equiliser

Download

1 298750000 1.4 38.6 256 qam21
2 322750000 1 38.6 256 qam24
3 314750000 1 38.6 256 qam23
4 306750000 1 38.9 256 qam22
5 290750000 1.4 38.9 256 qam20
6 282750000 1.5 38.9 256 qam19
7 274750000 1.2 38.6 256 qam18
8 266750000 1.7 38.9 256 qam17
9 258750000 1.7 38.9 256 qam16
10 250750000 1.7 40.3 256 qam15
11 242750000 1.7 38.9 256 qam14
12 234750000 1.9 38.9 256 qam13

Upload

43 32600000 ATDMA 39.5 16 qam 6400000 5120
41 46200000 ATDMA 41 16 qam 6400000 5120

Edited by Grzyb (Sat 23-Jul-16 17:10:23)

Standard User Grzyb
(member) Sat 23-Jul-16 15:25:22
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Re: Forward Path Equaliser & Install Questions


[re: Ignitionnet] [link to this post]
 
In reply to a post by Ignitionnet:
I'm interested in why a repull is needed but he wanted to use a 12dB FPE.

Assuming that a 12dB FPE was actually needed sounds more to me like the slope on the network needs checking out, not just this one punter needing a repull.

A repull is I thought needed when return path transmit is too high or receive power too low. That doesn't really fit with having the low end too hot.


Hi,

A bit over my head!!!! Don't know When it was Installed, he said straightaway that a "Repull" would be required, as I was at the very bottom end of what was acceptable.....??? & would have issues in the Longer Term, if not done......He searched for a while in his box of tricks looking for the 12db Path Equaliser, but couldn't find one, so put the 4db one on......

My Neighbour has a 12db one on their Install, going to the same Cabinet, so I assume it is a Standard, for our installs.......???

I have the Install Paperwork as mentioned, so just need some advice, whether I should Contact Virgin & ask for another Engineer to attend & check, Or will I get the same one!!!!!


"Just been told by the Wife, that the Virgin Engineer came round yesterday evening, after I'd left for work & replaced the 4db Forward Path Equaliser with a 12db one, so the Stats that I have given are with the 12db Forward Path Equaliser fitted....Women!!!!!!!!!!!"

Edited by Grzyb (Sat 23-Jul-16 16:24:16)

Standard User jb66
(committed) Sun 24-Jul-16 22:19:03
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Re: Forward Path Equaliser & Install Questions


[re: Grzyb] [link to this post]
 
Both are fine
Standard User Grzyb
(member) Mon 25-Jul-16 02:53:43
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Re: Forward Path Equaliser & Install Questions


[re: jb66] [link to this post]
 
In reply to a post by jb66:
Both are fine


Cheers, You don't happen to know what the "Tolerances are? Just in case they "Drift" Out....
Standard User Lithurge
(regular) Mon 25-Jul-16 11:52:28
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Re: Forward Path Equaliser & Install Questions


[re: Grzyb] [link to this post]
 
Not sure what the engineered tolerances are, but speaking from experience I've found it usually fails once it gets over +12 on the power levels.

My understanding is that generally running as close to 0 (whether the level is positive or negative) is the ideal, but my experience over the years has been running happily from around the -4 mark you're currently at without the equaliser to +8 which is where mine is currently running,

Edited by Lithurge (Mon 25-Jul-16 12:12:51)

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