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Standard User gdavid
(committed) Sun 23-Mar-14 13:01:05
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Billion 7700n router constantly dropping line


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I have a Billion 7700n router. I am located in the sticks so a long line to the exchange.

In the last few months the connection has been having regular dropouts, but the router still shows the internet being connected. I am not sure if this is down to line conditions or whether there is some problem with the router.

I am enclosing a copy of the stats - hopefully I have the correct page.

Any advice would be welcome.

Statistics -- xDSL

Mode: ADSL_G.dmt
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 109 130
Attenuation (0.1 dB): 630 315
Output Power (0.1 dBm): 174 123
Attainable Rate (Kbps): 2432 524

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 2240 416 0 0

K (number of bytes in DMT frame): 71 14 0 0
R (number of check bytes in RS code word): 8 0 0 0
S (RS code word size in DMT frame): 2.00 1.00 0.0 0.0
D (interleaver depth): 32 1 0 0
Delay (msec): 16.00 0.25 0.0 0.0
INP (DMT symbol): 0.85 0.00 0.0 0.0

Super Frames: 86139 86139 0 0
Super Frame Errors: 95 2 0 0
RS Words: 2928694 0 0 0
RS Correctable Errors: 3195 3 0 0
RS Uncorrectable Errors: 1206 0 0 0

HEC Errors: 873 0 0 0
OCD Errors: 0 0 0 0
LCD Errors: 0 0 0 0
Total Cells: 7735376 0 0 0
Data Cells: 1850334 0 0 0
Bit Errors: 0 0 0 0


Total ES: 15 0
Total SES: 0 0
Total UAS: 19 19


Regards


David
Standard User camieabz
(sensei) Sun 23-Mar-14 13:22:35
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Re: Billion 7700n router constantly dropping line


[re: gdavid] [link to this post]
 
Your SNR Margins and 10.9dB downstream and 13.0dB upstream. Ideally these should be 6.0dB or thereabouts. There might be scope for having that investigated by your ISP (not mentioned in your post).

The line: D (interleaver depth): 32 1 0 0

I believe, but you should check with your ISP, that the second character of "1" indicates 'fast path', which is inclined to be more error-prone. You should ask if interleaving is on/off on your line, and you really should get it enabled.

Your ping speeds might suffer slightly, but your line errors should reduce with interleaving on.
Standard User gdavid
(committed) Sun 23-Mar-14 14:18:58
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Re: Billion 7700n router constantly dropping line


[re: camieabz] [link to this post]
 
Thanks for the reply.

The ISP is Xilo.

I think that this is a Broadcom chipset so should be adjustable from here? Though I have forgotten the procedure.

I have been watching the downstream SNR and it is constantly changing - see below. Also goes up to 116.


Line Coding(Trellis): On On
SNR Margin (0.1 dB): 93 130
Attenuation (0.1 dB): 630 315
Output Power (0.1 dBm): 174 123
Attainable Rate (Kbps): 2432 524


Regards


David

Edited by gdavid (Sun 23-Mar-14 14:19:53)


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Standard User camieabz
(sensei) Sun 23-Mar-14 17:18:35
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Re: Billion 7700n router constantly dropping line


[re: gdavid] [link to this post]
 
Probably due to the long line and the noise on it fluctuating. As far as I know interleaving on/off is an ISP request thing, or at least it is with Plusnet.
Standard User XRaySpeX
(eat-sleep-adslguide) Mon 24-Mar-14 01:06:19
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Re: Billion 7700n router constantly dropping line


[re: camieabz] [link to this post]
 
In reply to a post by camieabz:
I believe, but you should check with your ISP, that the second character of '1' indicates 'fast path'
No, the 2nd no, 1, is the interleaving depth on upstream, but when we talk of Fast Path or not we are referring to downstream, on which the interleaving depth is 32, i.e. not Fast Path.

On BTw platforms, incl. PN, it's the DLM that decides Fast Path or not. The ISP does not have much control of it, tho' it can set it initially but DLM will then take over.

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 20 Meg WBC
Standard User camieabz
(sensei) Mon 24-Mar-14 08:40:51
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Re: Billion 7700n router constantly dropping line


[re: XRaySpeX] [link to this post]
 
Why the sad face? smile
Standard User gdavid
(committed) Mon 24-Mar-14 10:55:09
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Re: Billion 7700n router constantly dropping line


[re: XRaySpeX] [link to this post]
 
Thanks for the replies.

Incidentally this line runs on the TT network via Xilo, so the DLM is not as rigorous as others.

Regards


David
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