Talkaphone IW-HFM-4 Interview Window 4-Button Master - Manual (Page 8)

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Figure 6. Intermediate Interface Box Wiring
9. Connecting Paging Bus Cable to Final IW-IB-6 Interface Box
On the white terminal block included with the Interface Box, connect all wires from the
paging bus cable from the previous Interface Box to similar wires from the Interface Box
as shown in Figure 7 below. For the final Interface Box only leave the 620 Ohm, 1/2Watt
Terminating Resistors connected between each pair on the Interface Box side of the
terminal block.
If a music/program source is being used, connect another shielded pair from the music
terminals on the Interface Box to the last three terminals on the terminal block. Then
run this cable to the music/program source. For the final Interface Box only connect a 620
Ohm, 1/2 Watt terminating resistor (included, but not factory installed) between the
music source terminals on the Interface Box side of the terminal block as shown in
Figure 7 below.