- Microfilters
- Posted by Ian Bell on July 29th, 2004
Are microfilters really necessary? My ADSL router just arrive although
broadband is not due to be enabled for another four days. Just for fun I
connected it to my PC and the phone line and to my surprise broadband was
working. However, because is was just a test I had not fitted any
microfilters. The phone rang a few minutes ago, it works fine and it did
not affect my internet connection. hence my questions, are microfilters
really necessary?
Ian
- Posted by Fred on July 29th, 2004
"Ian Bell" <ruffrecords@yahoo.com> wrote in message
news:2ms28rFpu651U2@uni-berlin.de...
I think you can get away with it if you are close to the exchange.
Otherwise the load imposed by the phones etc without filters will reduce the
ADSL signal too much.
The first thing that happens (as you get further from the exchange) is that
the ADSL connection will fail when the phone rings. Then, further away
still just using the phone with break the ADSL.
- Posted by Tiscali Tim on July 29th, 2004
In an earlier contribution to this discussion,
Fred <none@none.com> wrote:
My ADSL won't work without filters without unplugging all phones (or running
from the test socket in the master, with the faceplate removed - which
amounts to the same thing). The presence of *any* phone stops it - the
phone doesn't have to be in use.
As has been said in this and other threads, this seems to be a
distance-related effect.
Even if ADSL works without filters, you may get some noise on the speech
lines when ADSL is running if you don't have filters.
If your master socket is in the right place to connect your ADSL equipment,
use a filtered faceplate in that rather than individual filters. If your
extension sockets are wired into the back of it, they will then be
automatically filtered.
--
Cheers,
Tim
______
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- Posted by Ian Bell on July 29th, 2004
Tiscali Tim wrote:
I am pretty sure i am within a couple of miles of the exchange - that is the
the overhead phone lines follow the road between our village and the next
where the exchange is situated. Is that a relatively long, short or typical
length? My modem shows a downstream line attenuation of 36dB and a SNR
margin of 38db - is that good/bad/average? It is a 500K connection and the
modem says the data rate is 576K/bits/s.
Ian
- Posted by Fred on July 29th, 2004
"Ian Bell" <ruffrecords@yahoo.com> wrote in message
news:2msel1Fqk1coU1@uni-berlin.de...
The downstream attenuation sounds excellent. The limit for providing ADSL
is 60dB (I believe), so that's probably why it can work without filters.
However, I would advise the use of filters in the long term, in case you
plug in a new phone or the line characteristics change (for example when
winter comes).
- Posted by Hiram Hackenbacker on July 29th, 2004
On Thu, 29 Jul 2004 11:38:15 +0100, Ian Bell <ruffrecords@yahoo.com>
wrote:
Obviously not in your case.
--
Hiram Hackenbacker
- Posted by Ian Bell on July 29th, 2004
Fred wrote:
Sound advice. Thanks Fred.
Ian
