[Gllug] ADSL problem

Dylan dylan at dylan.me.uk
Mon Feb 28 00:05:51 UTC 2005


On Sunday 27 Feb 2005 23:37 pm, Chris Bell wrote:
> On Sun 27 Feb, Dylan wrote:
> > There is a small amount of circuitry in the "master socket" (the
> > one directly connected to the exchange) on your phone line. This
> > "termination" completes the electronic circuitry of the phone line
> > (in very general and simplified terms.) Extension sockets are
> > daisy-chained to the local side - you can plug in a splitter and
> > extension lead, or split the connection inside the master box, it
> > doesn't matter which.
> >
> > When you plug a microfilter into the phone jack the filtering
> > happens on *your* side of the termination. In the solwise
> > faceplate, the filtering happens on the BT side of the termination.
> > This means the ADSL signal never reaches your telephone socket,
> > whereas with the plug in filter it does.
>
>    The original spark gap and a terminating resistor are left inside
> the rear section of the master box, but the original capacitor which
> would normally provide the third "ringer" connection is not used, and
> is replaced by a similar capacitor on the local side of the filter.
> Any local telephone extensions fitted to either front or back sides
> of the front panel will be connected to the local side of the filter.

Thanks for that clarification - so effectively in the termination before 
the filter but the "dummy load" is on the phone side?

Dylan
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