ANTWERP / BTMC Intercom 10 lines 2731A

[dsk]

ANTWERP / BTMC Intercom 10 lines 2731A

This Should work together with most other DC ringer systems. Battery voltages depends on line lenght, and what ringers in the other end.

A little strange wiring ( by my opinion)

TB-  (Talk battery , negative) seems to be the common wire for talk circuit.
RB+ may be common for ringing circuit.
    TB- And RB + could probably be linked together.
My other wire for incoming ringing and talking is marked L and all the other subscribers has their own 1...10 wire.

Fully used 11 telephones (10 others) will require 12 wires + 2 batteries at each telephone.


If you want to use it to answer on a regular telephone line, conncet the line to TB- and L (you may try TB- and TB+ this should give a weaker speak signal.)

dsk