Re: Varying Noise Margin

In an earlier contribution to this discussion,
Chris <nospam@[127.0.0.1]> wrote:

> I have been getting occasional ADSL loss of synchronisation and
> varying noise margin figures. I have tried everything I can think
> of, including rewiring my extension with ethernet cable - and I'm
> wondering if anyone can suggest anything else?
>
> Situation:
> * 5 km from exchange
> * Pipex
> * Netgear DG834 version 2 latest firmware
> * Line loss 49
>
> Noise margin is all over the place.
> It doesn't seem to relate to anything in my house
> (although there may be things I'm not yet aware of).
> Sometimes connecting another computer to the router causes the SNR to
> drop - but not always.
>
> It is usually between about 6 and 17.
> (But why should it vary?)
>
> Sometimes the router loses synch continuously, dropping out and
> re-connecting about once a minute. When this happens, rebooting the
> router usually helps.
>
> BT have been very helpful and have given me the best available on the
> E-side and on the D-side and my Line Loss has gone from 59 to 49.
>
> Any ideas will be gratefully received and valued.

Have you tried a different router and/or power supply for the router?

I don't know whether the problem I had affects Netgear kit, but my 3Com
router won't work reliably with the switch-mode power supply provided by
3Com - but is fine with a generic 3rd-party power supply.

Have you got any other kit (e.g. laptop computer) using a switch-mode power
supply, which could be injecting noise into the system?
--
Cheers,
Tim
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