Guh! Of course I did; just forgot to state the obvious.

I thought filters were for filtering the BB out of the Voice, not t'other way round, so was needed with a isolated phone.

In reply to a post by XRaySpeX:

I thought filters were for filtering the BB out of the Voice, not t'other way round, so was needed with a isolated phone.

Yep! This time it's you that is right. I was confusing it with getting line stats.

So test socket with filter or no filter ?

Phone >> filter >> test socket.

Also, I don't know if it's been said, while you have the faceplate off make sure no other sockets in the house work.

Is there a phone-connected burglar alarm?

Will do and the alarm is not connected (mainly as it's a big hairy dog )

In reply to a post by XRaySpeX:

Guh! Of course I did; just forgot to state the obvious.

I thought filters were for filtering the BB out of the Voice, not t'other way round, so was needed with a isolated phone.

If the modem isn't connected, there won't be any broadband to filter so a filter is unnecessary when connecting the phone to the test socket.

OK now I'm confused...

Testing phone - use filter
Testing BB - no filter

Is that correct ?

What BatBoy says also makes sense. Now I think about it, I'm sure I've done phone testing with no filter.

Try it both ways. The worst that can happen is that without the filter you get a heck of a racket, and with it none or some. There should be none.

Broadband definitely without filter except the plug looks odd. A filter with nothing else connected to it except the router doesn't really create an issue.

Broadband definitely without filter except the plug looks odd. A filter with nothing else connected to it except the router doesn't really create an issue.

? Most DSL modem cables have a plug that only goes into the filter, not an unfiltered socket, surely?

Not that I've tried to make it fit, but the plug on a DSL modem cable is an RJ11, and the BT plug, er, isn't.