15 day rule ?

[old Bill]

All the street lights down my road were recently changed. This was not a problem in itself however while they were doing it my line kept on cutting out. My N/M has now gone up to 12 even though the work has now been completed and my line is fine again. Is it true that if your line and router stays connected for i think its 15 days your N/M will drop again ?

[Rik]

The theory is, Bill, that if you stay connected (and that means no re-syncs) for 14 days, your noise margin will reduce by 3db on the 15th day, and the process will repeat until you reach instability or 6db, whichever comes first.

In practice, it doesn't always seem to work, but the first thing to do is maintain that sync.

[old Bill]

Yes I have held my sync of 6120 for the last week no problems at all. It was just when they dug up all the street lights.

[Glenn]

So potentially, my router may connect faster if I get IDNet to ask BT to lower the connection profile from 9db back to 6db?

[Rik]

It should, Glenn. BT tend to be a bit difficult on lowering target margins, especially if they have been set by the line management software. If it was manually set high, pre-2700, then it might be a bit easier.

[ducky22]

So potentially, my router may connect faster if I get IDNet to ask BT to lower the connection profile from 9db back to 6db?

What type of router do you have? Some allow you to set the target SNR rather than going through BT.

[Glenn]

It should, Glenn. BT tend to be a bit difficult on lowering target margins, especially if they have been set by the line management software. If it was manually set high, pre-2700, then it might be a bit easier.

Yep I believe it was requested by IDNet pre 2700HGV when my Netgear had problem holding on to the line. The lowest I have seen it since I have been using the 2700, is about 7db.

[Rik]

Sounds like my story, Glenn. I had the target margin lifted to 9db to stabilise the line. With the Netgear I would see fluctuations of, maybe, 7db during the day and after 10-12 days it would re-sync. The 2700 is giving me 10db during the day (I connected in the evening), 9db overnight and has shown a couple of 'swings' to 8db and 7db. I never realised a router could make such a difference to noise margin.

[ReDGryphoN]

........the dark side Rik..............
ReD

MAABOF

[Rik]

I've been muttering "Comms is a dark art" since I first went online in 1984, Red. Nothing has changed since to convince me otherwise.