Filtered faceplates and bell wires

Can someone take a look at this post on a forum run by a hardware supplier, and comment on the reasoning behind it ? I'm not totally sure that in some circumstances a bell wire filter isn't required, but this chap says that if ADSL travels down a wire with no bell wire, you don't need one (even if the phones have one) ?

Is there a particular paragraph you are querying? I read it as saying you are OK as long as the bell wire isn't connected to an ADSL signal.

The post doesn't really make sense. It doesn't explain whether or not the bell wire is even connected at the master or slave sockets. If it isn't, a bell wire filter will be of no use anyway. Maybe I'm missing the point though.

The post doesn't really make sense

I'm pleased someone else thinks that. The post also misses the point that a filter only attenuates noise, this may not be enough is some situations. Removing the bell wire eliminates the problem.

Nigel

The bell wiere dates back to when we used to have rotary dials on the phones. If there was no bell wire and you dialled on one phone, the other phones (extensions) would tinkle!!

If the bell wire is connedcted at the main socket in your house, and you are NOT using rotary dial phones, then this bell wire is acting as an aerial on your ADSL connection and picking up all sorts of noise/inteference.

In a domestic situation, disconnect the bell wire from the main socket. When I did this on my installation the speed increased from 800Kbytes to 2.5Mbytes!!

Some (mainly older) push button phones also use the bell wire. Some of their reasoning is "unclear", but the assertion that you do not want anything to 'interfere' with your ADSL signal is correct and the best way to achieve that is to have a central filter for the telephone extensions and connect the modem to the unfiltered socket on that. (or run a cable from the filter to the modem). If individual filters are used then disconnecting the ring wire at the master socket should provide an improvement, if filters are manufactured to spec (BT SIN 346), then they will supply ring voltage to the required pin of the telephone (filtered) socket.
ADSL filters are necessary as the telephones will short out the ADSL signal. The filters do this by blocking the path for the high frequency signal to the telephone socket.