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Standard User Sam234
(newbie) Fri 26-Aug-11 21:30:50
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Issues ISP/BT Can't (wont) Find/Fix

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My ISP is plusnet, my problems are variable speed (400k today, just went up to 3.1M this evening)

I was getting around just 1M for a while, after leaving modem on for 4 days (at plusnets insistence) it rose to 2.8, then dropped again!!

Modem reports line speed between 2.8M & 4.4M

Last few days FEC was high (now static at 0) CRC HEC OK
Now CRC & HEC (down) high

BT engineers have tested before & claim they find nothing.

On latest plusnet have tested & found no error, but on the bases of line noise they can hear (not me) they are tying to raise fault with BT, but BT are dragging their heals

This is the current modem stats:

Uptime: 0 days, 23:51:38
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 4,064
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 19.5
Line Attenuation (Up/Down) [dB]: 27.5 / 49.0
SN Margin (Up/Down) [dB]: 19.0 / 5.0
Vendor ID (Local/Remote): TMMB / TSTC
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 28 / 0
FEC Errors (Up/Down): 0 / 0
CRC Errors (Up/Down): 1 / 10,424
HEC Errors (Up/Down): 1 / 6,063

I`m just hoping one of the experts here might have an idea what's wrong.
Standard User b4dger
(knowledge is power) Sat 27-Aug-11 10:04:40
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Re: Issues ISP/BT Can't (wont) Find/Fix

[re: Sam234] [link to this post]
I can recommend Routerstats (it's free) to monitor your connection...

It might help you find out what's happening.

Standard User jmoore032000
(newbie) Fri 02-Sep-11 14:22:37
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Re: Issues ISP/BT Can't (wont) Find/Fix

[re: Sam234] [link to this post]

Looking at your line stats the connection is holding at a low SNR 5db on the down so the sync presently is ok. However if a fluctuation occurred there is more chance that the line will drop and speed reduce. You could request the profile to be increased this may stop drops but would also equally reduce the speed.

I would check what SNR profile you are on to see if it is holding as expected. 5 on a 6db profile or 5 on a 12db profile.

I would ensure your local diagnostics are done, PSTN line clear of noise, connect to the test socket, change filter, RJ11 cable, alt router to make sure it is not anything local causing the issue.

Afterwards I would suggest seeing if there is a pattern to any line drops and how many drop there are. Ask your ISP to look at the graphical RRT data on the line if they have access to do so. They hopefully will have access to see a daily breakdown on the amount of SNR fluctuations, MTBE, initialisations etc. The main one being the SNR to see if it is spiking, this will cause the sync speed to change and you may need to progress it as an intermittent fault.

If getting nowhere then look to escalate the fault but always be nice to technical staff and be willing to follow the procedures.

Edited by jmoore032000 (Fri 02-Sep-11 14:36:45)

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