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Standard User gouledw
(learned) Thu 23-Feb-12 23:31:56
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What router will work?


[link to this post]
 
We've had the Business Hub - that failed

We've had the DG834 - that failed.

We've had the DGN2000 - that failed.

We've had the Home Hub 3 - that failed.

Is it really time to splash out on a billion 7800N to try and solve our dropping connection? We've had engineers out, 3km of cable replaced from gauge 0.5 to .9 which helped. Will this router be any better? I've heard it works miracles.

Line Stats:

ADSL Line Status
Connection information
Line state: Connected
Connection time: 2 days, 06:56:51
Downstream: 2,528 Kbps
Upstream: 448 Kbps

ADSL settings

VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 0.4 dB / 14.0 dB
Line attenuation (Down/Up): 81.5 dB / 31.5 dB
Output power (Down/Up): 18.0 dBm / 11.9 dBm
FEC Events (Down/Up): 17724300 / 828
CRC Events (Down/Up): 1493 / 177
Standard User BatBoy
(legend) Thu 23-Feb-12 23:37:39
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Re: What router will work?


[re: gouledw] [link to this post]
 
Line attenuation (Down/Up): 81.5 dB
I think a 2wire is recommended for looong lines. Dunno which one though.



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Administrator MrSaffron
(staff) Thu 23-Feb-12 23:40:17
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Re: What router will work?


[re: gouledw] [link to this post]
 
81db attenuation and 2.5meg, you are out performing any expectations already

How did routers fail?

.9 gauge and 81db suggests around a 10km line

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.


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Standard User RobertoS
(sensei) Thu 23-Feb-12 23:41:03
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Re: What router will work?


[re: gouledw] [link to this post]
 
Are you tweaking the noise margin? That looks to be an incredibly high connection speed for the attenuation.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
Standard User XRaySpeX
(eat-sleep-adslguide) Fri 24-Feb-12 00:07:11
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Re: What router will work?


[re: gouledw] [link to this post]
 
In reply to a post by gouledw:
Noise margin (Down/Up): 0.4 dB / 14.0 dB
Point of failure! No router will cope ("not fail" in your speak) at this low level on your excessively long line. You are lucky to get BB at all frown

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User gouledw
(learned) Fri 24-Feb-12 08:01:06
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Re: What router will work?


[re: XRaySpeX] [link to this post]
 
These are stats from the morning, and it held throughout the night, wonder why? wink

The router's failed because none of them held the line, which is why I ask if the billion will be any better? because at least then I can tweak the noise margin up a bit to give some stability, and with it having a good chipset we should have a good speed anyway. BT won't look into the fault, because the line is still performing well. The SNR margin is locked in at 6dB and won't move up or down.

ADSL Line Status
Connection information
Line state: Connected
Connection time: 2 days, 15:26:42
Downstream: 2,528 Kbps
Upstream: 448 Kbps

ADSL settings

VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 3.3 dB / 14.0 dB
Line attenuation (Down/Up): 81.5 dB / 31.5 dB
Output power (Down/Up): 18.0 dBm / 11.9 dBm
FEC Events (Down/Up): 24224465 / 848
CRC Events (Down/Up): 1588 / 179


And our line is 9.62km long. And when we connect the router, the TNM is 6dB and then it drops by up to 6 at night, is this normal or should it just be by 3?

Edited by gouledw (Fri 24-Feb-12 08:06:48)

Standard User john2007
(legend) Fri 24-Feb-12 08:53:17
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Re: What router will work?


[re: gouledw] [link to this post]
 
Not really such a thing as normal. The environment of every line will be subtly different even to those adjacent to it.

Nothing looks odd in a drop of 6dB overnight. More radio interference at night.

As others have said your line would seem to be performing much better than the average for its attenuation.
Standard User gouledw
(learned) Fri 24-Feb-12 09:03:51
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Re: What router will work?


[re: john2007] [link to this post]
 
Thanks for clearing that up. But is it worth splashing out on that router?
Administrator MrSaffron
(staff) Fri 24-Feb-12 09:32:48
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Re: What router will work?


[re: gouledw] [link to this post]
 
No one can answer that for you, as your line is very much outside the norm.

Is the router affordable? And if it fails (which is the wrong word to use as people think you mean blown up) how much is it worth second hand?

If seeing a 6dB swing then the standard practice would be to increase the initial target to 9dB or 12dB to slow down the service and provide enough stability, giving you perhaps 1 to 1.5Mbps connection speed but less drops.

Every 3dB of attenuation means the signal has halved in strength, so at 80dB, it is has been halved 30 times, so no surprise to find that noise is a big problem.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User gouledw
(learned) Fri 24-Feb-12 10:07:54
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Re: What router will work?


[re: MrSaffron] [link to this post]
 
BT will not rise the SNR. THey've locked it into place so that the speed won't decrease. An indian person tried an SNR reset the other day, and the system didn't respond to the request, because they dont have authaurisation to do it. The only way my line can have an SNR reset is if someone at BT Wholesale manually does it.
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