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raincode
29/10/2009, 19:33
We had a sudden line fault last thursday. A BT engineer came out on monday and after a few hours investigation told us that the fault was in the exchange. Tuesday morning our connection was back up but our SNR margin has been hiked up to 15dB, presumably from all the disconnects during the fault.

Anyway, we used to get sync speeds over 6000 but now thats down to less than 4000. At the moment its 3008.

I've been told that the DSL connection must stay up for 14 days for BT to automatically reduce the SNR margin, but I have doubts as to whether thats possible for a consumer router, especially after some bittorrent.

I read somewhere that its possible to get BT to reset the profile after a line fault. Is that right?

Link Information

Uptime: 0 days, 2:15:03
Modulation: G.992.1 Annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 3,008
Data Transferred (Sent/Received) [KB/KB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 18.5
Line Attenuation (Up/Down) [dB]: 23.0 / 44.0
SN Margin (Up/Down) [dB]: 19.0 / 15.0
Vendor ID (Local/Remote): TMMB / µ
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): 19 / 0
FEC Errors (Up/Down): 0 / 0
CRC Errors (Up/Down): 0 / 24
HEC Errors (Up/Down): 0 / 14

James
29/10/2009, 19:46
THis can be done in some instances yes. Raise a ticket with this info and we'll get on to it.

raincode
30/10/2009, 12:17
Thanks for your reply James, if you read this please take a look at ticket 16535

Our modem rebooted again last night. It's not going to stay up for 14 days.

James
30/10/2009, 13:04
The problem is, if your router is not even maintaining days worth of SYNC with a high SNR of 15, then lowering it to 6 will make it a lot worse and disconnect much more. That, from BT's point of view, will probably mean they will not reset it until your line proves to be stable on its current setting :(

raincode
30/10/2009, 13:43
I'm certain the modem is crashing, and not loosing sync due toerrors. Our connection is pretty stable, only get a hand full over errors over a period of a few hours.

Consumer routers never seam to be as reliable as they should be. At least in my experience. It's fairly new, I got it a few months ago from the ADSL24 shop. It replaced another router which crashed regularly too with uPnP enabled. And uPnP doesnt work on the new speedtouch as we are using a seperate DHCP server + it seams to be crashing regularly now.

Since our line profile being modified was the result of a BT fault then it seams right that they put it back to what it was.

Soreen
30/10/2009, 14:53
I agree with you about the routers, that's why I have started using business / corporate ones. Total overkill in some regards but they're steady as a rock. I am quite a big fan of 2Wire routers :)

I have my eyes on one that the college is throwing away... they're pulling down the entire buildung and moving into new premises so are ripping out all their IT gear and I swear they don't know what they're doing. I saw G4s going into a giant shredder last week :(

James
30/10/2009, 15:34
If you're doing a lot of P2P stuff then routers will generally have issues as there are thousands of connections open, so the router can crash.