At 11:51 PM 1/19/2004 +1200, Tom Parker wrote:

>Steve & Prue <steve.eckett@xtra.co.nz> wrote:
>
> >This is however somewhat irrelevant. The DC component is only used for
> >remote powering of the phone, and basic signalling. The ADSL modem is an AC
> >(>30 kHz) device and doesn't care about polarity. So connect it either way
> >and it will work. The important thing is to get the filter correct, i.e. low
> >pass side to the phone, high pass to the ADSL modem.
>
>True, but I also have to repair the phone wiring and make the phones go, as
>well as the modem. What happens if you get it backwards? I assume the phones
>don't work, but nothing actually explodes?

Reversing the polarity will have no effect on the phone or modem. The only
catch may be if you have some of those ye olde BT type 3 wire jacks and
phones. Then you could strike problems if you have to rewire those old line
jacks..

Paul Warner

paul.warner@bigfoot.com

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