Re: Pipex broadband.

In article <gemini.izx9i4001e2rb02p8.ray@xxxxxxxxxxxxxxxxxxxxxx>, Ray
Dawson <ray@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Tim Hill <tim@xxxxxxxxxxxxxx> wrote:


Ooh, er. methinks maybe you need perhaps to brush up on elx theory
even about the effect of resistance connected in parallel, never mind
all the techy stuff bolted to the PSTN at both ends! The filter is
not simply between the exchange and your analogue phone but sits
across the lines shared by voice and ADSL doing god knows what:
soaking it up, creating an echo, or singing the eurovision winner. I
wouldn't believe all you read on any newsgroup. ;-)

Especially the above.

The microfilter is a series configuration, filtering out the adsl
frequency to stop it going to the 'phone socket. It isn't across the
line and doesn't affect the adsl signal going to the router. The router
has a tuned input filter which, in theory, removes voice components
going to the adsl decoder.

Thanks for that, Ray. Just shows you that systems must differ as I was
shown the inside of a microfilter and it definitely had components across
the main lines as well as the onward serial connection for voice.

An indication of whether or or not a microfilter is having an effect on
the adsl signal is to look at the router's line noise figure, with and
without the microfilter. You shouldn't see any difference.

Makes you wonder what they're for. ;-)

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