How about swapping routers? To see if bad line still bad and to also get error stats on it?

Since when did DLM systems start to control power?

A reading of 0dB for power is a common GUI issue

Output Power values sound like they are invalid. I suspect the DLM has (For some reason) reduced your Output Power on your bad line.

That, as Mr.Saffron has already pointed out, is utter tosh.

In reply to a post by MrSaffron:

Since when did DLM systems start to control power?

A reading of 0dB for power is a common GUI issue

I did state that they could be invalid, however I was not aware of such an issue.

In reply to a post by Zarjaz:

Output Power values sound like they are invalid. I suspect the DLM has (For some reason) reduced your Output Power on your bad line.

That, as Mr.Saffron has already pointed out, is utter tosh.

As for "Since when did DLM systems start to control power?" I guess the answer is, since it was created:

"DLM can make adjustments to the DSLAM output power, suggested target signal-to-noise-ratio (SNR) margin and sync rate and can choose to apply a technique known as interleaving which aids error correction."

(Taken from: http://en.wikipedia.org/wiki/ADSL_Max#Rate_adaptatio... )

Just going by what Wikipedia says on that subject

Edited by chris6273 (Mon 01-Aug-11 00:43:31)

Wiki is not always right. Even ISP support have frequently been wrong with regards to DLM on IPStream and WBC

Output power can go up and down, and a modem or DSLAM will vary it as needed to try and hold a target noise margin.

In short DLM systems do not set it, they generally only set the target noise margin. The 21CN WBC system can set a range of sync speeds that are a valid range for the line.

Also can control interleaving settings.

Meanwhile, back at the question... does anyone have any experience of this situation and know what is likely to happen? Clearly one line is dud and there is no spare. So do BT;
a. say "tough" and walk away
b. fix the line somehow
c. put new capacity in
d. do something else that I've not thought of

?

I'm in a similar situation, problem last seen with "Underground engineer" and I'm wondering what's going to happen.

a) is always an option open to them. c) might happen if enough people affected especially if voice services disrupted.

I live in a rural area so it's kind of only me and two other houses running off the same pole. A house up the road with a different pole doesn't have any issues.

I emailed Ian Livingstone's office and a nice man got back to me. Basically he said to begin with broadband fault = ISP issue, phone fault = their issue.

I told him that I had ran through everything with my ISP and that there was no internal wiring issues and that explained to him that the last time, the engineer got up the pole and changed pairs.

He said he'd do a few tests but any tests that BT done on the other line which was faulty (now working due to pair change) came back fine.

I'm not even sure BT would want to look at my case as it'd cost a bit of money putting a new cable back to the nearest distribution point only for one line.

Edited by deleted (Wed 03-Aug-11 04:13:54)