ADSL Modulation (Thomson ST585)

Hi all

Bit confused now... I always thought that the modulation on Plusnet ADSL should be G.992.1 but my *new* ST585v6 is reporting G.992.2 Annex A. I've tried to change this using opermode=multimode but it stayed as G.992.2 Annex A

Do I need to change this, if so which opermode value do I need to set? Everything seems to work.

Regards

Hmm G.lite

Do try to be a little more helpful and informative, especially to newcomers to the bbs.

Not everybody is familiar with your usual posting style.

In reply to a post by billford:

Do try to be a little more helpful and informative, especially to newcomers to the bbs.

Not everybody is familiar with your usual posting style.

I don't think your post is helpful in the slightest to be honest.

Batboy - Do you mean I should set the opermode to G.lite?

As in adsl config opermode=g.lite?

Is using G.992.2 Annex A going to cause problems/instability etc?

Regards

In reply to a post by FarmerGilesUK:

Batboy - Do you mean I should set the opermode to G.lite?

As in adsl config opermode=g.lite?

Is using G.992.2 Annex A going to cause problems/instability etc?

Regards

It appears G992.2 is also called G.lite. It apparently has a max sync of 1.5Mbits down and 512kbits up.

What is your connection synced at?

If it ain't broke, don't fix it.

Trouble is its very broke

I'm struggling to get a decent connection speed. Admittedly I'm on a long line BUT using Kitz's speed calculator I should get better going by my 61db attenuation figure.

Interestingly, my next door neighbour who is on the same overhead line (just a different pair) gets a very respectable 2mbps download and his connection is very stable at 2400, even at night, although his SNR does drop to 4.5db - He stays happily connected for 8+ days without a resync.

If I try to sync at anything over 1600 with a SNR of 8-11db, I get loads of FEC errors and the modem resyncs. By loads of errors I mean c26,000,000 FECS last night.

Just as a test, I used DMT tool to pull down the SNR margin slightly syncing at 1728 and my connection dropped after about 1 hour.

A senior guy at BT thinks there may be an issue with "pairs" not actually being a "pair" if you get mt drift, but whether they'll come out to investigate again I don't know.

Its a real pain in the ****

Edited by deleted (Tue 22-Mar-11 22:26:02)

I'd raise it with your ISP, looks like they have a configuration problem.

"A senior guy at BT thinks there may be an issue with "pairs" not actually being a "pair" if you get mt drift, but whether they'll come out to investigate again I don't know."

Split pairs are a whole different ball game. Start at the beginning, get an ADSL trained engineer out. I wouldn't be surprised to find you and your nieghbour on different E-sides (exchange to street cabinet). Keep plugging away at your BB ISP, it's down to them to see that this gets resolved.