bt cabling

[daiplayer]

Just come from a job : - they have had two phone lines installed , both owned by bt but one is a bt line. one is sky ( line rented off bt)

A problem arose with the one line . ( the sky one). and the bloke had a go at it himself and cocked the pairs up !!! :-(

the line in is a 4 core cable. obviously 2 cores: -for one line ( speech and ringing), and two more for the additional line.

How to i identify which is which ? .

ive done some dc testing , got one pair working for the phone number allocated : which showed 48 vdc between the cores.all working job done.
the other pair showed 48vdc the same, and i got it to speech ok. however , the other phone has caused some interference with it when picked up. and the phone deosnt ring properly....just sorta 'blips' ......

WTF ?? any ideas guys ?

 

[telectrix]

could be the pairs crossed. i.e. you got the + of line 1 with the - of line 2 and viceversa. or, is there still a fault on one line thast was there before?

 

[daiplayer]

not sure tbh. the one phone line working perfectly , ringing, answering , calling , etc...no prob.

The other line now and again was just coming up as engaged all the time ( when calling the number)

is it common for bt to use orange and white for their main pair ? which would just leave me with on pair ?

 

[Guitarist]

If he's messed with the BT main then he should have called them out to sort it. We aren't meant to touch anything before the main box, and now it's you who's played with it if there is a fault which BT have to rectify.