What is REN

Ringer Equivalence Number (REN) REN measures the load a device places on the line when ringing. A normal BT line will support a REN of at least 4, in other words at least a total of 4 phones/fax/modems should work on any line so long as their REN figures added together don’t exceed 4. The […] read more

On June 5th, 2016, posted in: REN by

Testing the telephone cabling

Testing the telephone cabling Firstly, disconnect the BT line completely. In the remote end bridge any two terminals (make a note of which two). Measure continuity between these two wires at the master socket end – should be no more than a few ohms. Repeat for the second pair of wires. If either show a […] read more

On June 5th, 2016, posted in: Uncategorized by

Telephone Fault Finding

  Telephone Fault Finding No ringing – Terminal 3 disconnected Phone ringing continuously.- Terminals 2 and 5 swapped (2 at one socket connected to 5 on another and vice versa) Very poor speech quality, possibly poor bell. – Terminal 3 and 2 or 3 and 5 transposed Ringing but no speech (or very poor speech) […] read more

On June 5th, 2016, posted in: telephone fault by

BT Dropwire External Cable

The BT Dropwire External Cable (The cable coming in from the telegraph pole) This cable often has Orange, White, Green and Black wires. Usually (but not always) Orange and White are the active pair and go to connections 2 and 5 in the master socket. In some master boxes (such as the type with a […] read more

On June 5th, 2016, posted in: external telephone cable, telephone cable by