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Quoting Julian Hall:
You would never need a filter *if* the modem were the only device on the line. The filter separates out the datastream from the voice traffic. If there is any other device on the same circuit using analogue signals, such as the list given earlier, Sky boxes etc, they will screw up the signals.
I (respectfully) disagree, you only need a microfilter on any analouge device, thus: http://www.thecaretaker.org.uk/images/option3.JPG (this is how my house is wired) If you look at this diagram of a microfilter, you can see that the adsl modem socket is passed directly through from the BT socket, the filtering only takes place on the socket you plug a phone into. http://www.adslnation.com/images/filters/YPL-002-microfilter.gif
One point I *did* forget. You need *every* socket in use on the same circuit to be filtered. Same circuit being the same phone number. So if you have two phones, a fax and the modem you need 4 filters. However if you have 4 sockets, but only two in use you only need 2.
Two phones, one fax and an adsl modem only requires three filters. Alex. -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.
