Rob Morley <(E-Mail Removed)> wrote in
news:(E-Mail Removed) .com:
> In article <Xns944E8358DBADFBRGxxx@62.253.162.114>, "BRG"
> (E-Mail Removed) says...
>> Rob Morley <(E-Mail Removed)> wrote in
>> news:(E-Mail Removed) .com:
>>
>> > In article <(E-Mail Removed)>,
>> > "Geoff Lane" (E-Mail Removed) says...
>> >> I've recently gone broadband, I've got four extension
>> >> sockets so purchased four splitters.
>> >>
>> >> The splitters were bought cheaply from a computer warehouse
>> >> and cost under 10ukp for all four.
>> >>
>> >> Strangely two of my phones are working fine without a
>> >> splitter connected to them however, I still need to use
>> >> DialUp on occasions and connecting through a splitter I am
>> >> getting connection rates of about 26kbps rather that the
>> >> previous 44kbps prior to ADSL activation.
>> >>
>> >> Is this normal or reflective of my cheap splitters.
>> >>
>> > Given the way that microfilters work I expect that's normal,
>> > although I couldn't find bandwidth specifications in a quick
>> > Google search on the subject.
>>
>> I have just done a test on a non-ADSL phone line. The result
>> was that the splitter made no difference whatsoever - 46.6 kbps
>> dial-up with or without. The splitter I tried was also a cheapy
>> - a socket- doubler style device with the brand name "Tehkal".
>> It could still be your particular make of splitter that filters
>> too sharply, of course. Or that mine doesn't filter at all :-)
>>
>> Suggest you narrow it down by disconnecting everything from all
>> phone sockets and try dial-up on its own. Then connect it via a
>> splitter and test again. Then connect in your ADSL modem as
>> well and retest. Then add the other phone handsets one at a
>> time.
>>
>>
> I wonder if having four splitters effectively connected in
> parallel is having a cumulative effect? I'd have thought it
> would be better to have a single microfilter at a central point,
> with a dedicated connection for the ADSL.
>
I haven't heard of that being a problem. Using a single filter at
the master socket is a recognised wiring strategy, but it
constrains where you can locate your ADSL modem.
One of my customers had background hiss on his phones even though
they were (allegedly) all connected via splitters. We double-
checked and found another phone in a bedroom without a splitter,
and that was the source of the problem. It appears that an
unfiltered phone can cause noise at audio frequencies. And because
the noise is at audio frequencies, the presence of splitters [which
are actually a low-pass filter] elsewhere won't help one iota.
So, one unfiltered (or faultily-filtered) phone can affect all of
the rest. Hence my step-by-step methodology for tracking down the
culprit.
--
BRG
===
http://www.brgservices.co.uk/