G
Guest111
Here are a few tips for people regarding telephone wiring.
1 no more than 2 wires per connector on IDC terminals,and they mu. be same size conductor.
2 On an incoming BT line there are 2 pairs,pair 1 is white& orange,pair 2 is black& green, the white and black being the A leg for each pair.
3 Extension bells are connected across terminals 3&5,if connected to terminals 2&5 this will cause the line to appear engaged.
4 an interesting fault occurs if the wires between terminals 2&5 are crossed between extensions or between master and extension,ie 2 to5 and 5to2,this will cause other phones to ring constantly when one handset is lifted.Another cause of the same fault is when there is either a break or disconnection in the wire to terminal 5(A leg),although these are not a particularly common fault they can be a real headscratcher when you do get one.
5 noise on the line is very often due to one leg shorting to earth,a simple way to check this is to measure between each leg and a good earth,a voltage means that the leg you are not connected to is earthing somewhere,eg between A leg and earth you get a voltage this indicates that the B leg is shorting to earth somewhere.the earth of a socket is ideal for this test.if you get this fault it is worth splitting at the master socket and testing the incoming cable as this will show if the fault is inside i.e customers problem or outside,i.e service providers problem.
1 no more than 2 wires per connector on IDC terminals,and they mu. be same size conductor.
2 On an incoming BT line there are 2 pairs,pair 1 is white& orange,pair 2 is black& green, the white and black being the A leg for each pair.
3 Extension bells are connected across terminals 3&5,if connected to terminals 2&5 this will cause the line to appear engaged.
4 an interesting fault occurs if the wires between terminals 2&5 are crossed between extensions or between master and extension,ie 2 to5 and 5to2,this will cause other phones to ring constantly when one handset is lifted.Another cause of the same fault is when there is either a break or disconnection in the wire to terminal 5(A leg),although these are not a particularly common fault they can be a real headscratcher when you do get one.
5 noise on the line is very often due to one leg shorting to earth,a simple way to check this is to measure between each leg and a good earth,a voltage means that the leg you are not connected to is earthing somewhere,eg between A leg and earth you get a voltage this indicates that the B leg is shorting to earth somewhere.the earth of a socket is ideal for this test.if you get this fault it is worth splitting at the master socket and testing the incoming cable as this will show if the fault is inside i.e customers problem or outside,i.e service providers problem.
