fax and internet clash

have just installed 2 slave sockets to a 3 part master socket.
input to Master A and B is blue pair and output comes from back of socket on pins 2 a 5 to first slave and then onto second slave pins 2 and 5 with all polarity correct.
nothing is plugged into master test socket
1st slave has a laptop on broadband
2nd slave has a bankcard swipe card on a normal tel plug and a rj11 feeding a fax -
swipecard and fax work normally
but can only get broadband on disconnecting fax
ie says no dial tone
48 volts present at all sockets - all sockets been changed - fax substittuted
has anyone came across this - installation tests sound except for this clash
these were working in one office with the master and 1 slave
cheers

Try connecting a phone in place of the fax. Do you get broadband when phone is in use?

Have you forgotten to plug in a filter between fax/swipe card and line ?

Edited by deleted (Thu 02-Jun-11 20:52:43)

If nothing is plugged in to the master test socket, how does the signal get to the two slave sockets? At least the front plate should be plugged in there.

Didn't he say slaves were wired to back of master?

However he never mentioned filters in any socket! Typical cause of his problem?

yes the output is from the back of the master with the plate plugged in.
the broadband has a filter and i shall put one on the fax machine.
i should have paid more attention to the original setup.
the fax and card swipe originally was fed from the test socket of the master and i vaguely remember the broadband being paralled off the input to the master socket on pins A and B. but not so sure.
will try fax filter and separating broadband signal to another master or slave in parrallel with input to see results whichever will work cheers
will keep you posted

Now, which "back"?

Extreme back of master socket or back of master socket's faceplate?

Is a bit confusing. No doubt the lack of a filter for the fax/card machine dosnt help and maybe the root cause, but just for the OP's benefit the A+B terminals on the back of the master socket are for the external line to terminate only. No internal extension wiring should be connected to the A+B terminals, that should be connected to the terminals 2+5 on the front section, which is sort of alluded to in the 1st post, so I'm not sure if its wired correctly or not.

ALL customer wiring should be connected to the removable part of the plate - it is the only way to totally isolate the incoming BT wires if there is a problem.

You MUST have a filter on all telephony devices, phones, fax, PDQ, dial up modems, Sky box &c . It is not necessary to fit one if it just an ADSL modem is fitted to the socket.

A fax machine is just a phone, and MUST have a filter, in fact some faxes may require two filters in series, particularly if an older model