On 05/15/2011 08:50 PM, Jeremy Visser wrote:
Ken Foskey said:
So I can totally remove the filter if only adsl connected? Phone is
on another socket on same line
Yes, absolutely. ADSL filters stop the voiceband devices interfering
with the modem, not vice versa.
On a splitter+filter, the phone plug goes through the filter, but the
ADSL plug is a simple pass-through without any filtering.
Some people will claim that their PSTN voice quality improves with a
filter, but as the filters are not designed to do that people who claim
that are suffering from the placebo effect.
I wouldn't say that is necessarily true. The frequency range transmitted
through PSTN is quite narrow and any noise introduced into the line
outside that range is going to be just that, noise. A filter that blocks
frequencies not used for voice could well improve the SNR as delivered
to the ear. (The ear being quite able to hear frequencies outside the
range of the PSTN). Ergo if you have high frequency noise on the line
(or your noise is made of high frequency components, clicks and buzzes
perhaps) an adsl filter would do a good job of knocking that on the head.
Wont do your ADSL any favours however.
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