Specifications

3
Connections
Loop Start Trunk
Figure 1 illustrates the connection of the ZPM3 to a Loop
Start Trunk port and optional night bell connections. See
Figure 2 if the system requires a 48V talk battery.
Ground Start Trunk
Figure 3 illustrates the connection of the ZPM3 to a Ground
Start Trunk port and optional night bell connections. See
Figure 2 if the system requires a 48V talk battery.
NOTE: The line from the GS terminal of the ZPM3 must be
connected to the PBX ground (usually the PBX AC ground) for
correct operation.
48V Compatibility
If it is necessary to supply 48V talk battery to the trunk port,
a 48V DC power supply (Bogen Model PRS48) is also
required. Connect power supplies as shown in Figure 2.
NOTE: In applications where RI & TI Terminals are connected to
R & T Terminals, a regulated power supply with very low AC ripple
must be used (PRSLSI recommended). Any ripple on the power
supply will appear as “hum” on the paging audio.
Paging Port
Figure 4 illustrates the connection of the ZPM3 to a Paging
Port. It is important that the port provide an audio pair
that does not suppress the DTMF information. Also,
the port must provide a normally-open contact closure (or
use VAR1). When using the ZPM3 with the paging port,
the talk battery and audio are separated, thus providing
virtually noiseless switching.
Station Port
Figure 5 illustrates the connection of the ZPM3 to a Station
Port. It is necessary to use a TAMB2 Telephone Access
Module in all station port applications. Refer to the
TAMB2 installation instructions to connect the TAMB2 to
a station port. If the external contact closure of the TAMB2
is in use for another function, connect the ZPM3 to the PT
and PR terminals of the TAMB2 as if it were a loop start
trunk.
NOTE: To reduce system hang-up transients, it is preferable to
connect as shown in Figure 5.
Connections to the Telephone System
ZPM3
PBX
+
C.O. LINE
(INCOMING)
LOOP START
TRUNK
NIGHT RING
CONTACT
PBX ANALOG
NIGHT LINE
T
R
SEE
NOTE 1
ZPM3
+
+
24V POWER
SUPPLY
48V POWER
SUPPLY
24V POWER
SUPPLY
= Jumper Wire
NOTE:
1. EITHER USE NIGHT RING CONTACT FROM PBX OR ACTUAL NIGHT LINE
RING SIGNAL TO ACTIVATE ZPM3 NIGHT RING FUNCTION. USING BOTH IS
NOT RECOMMENDED.
Figure 1 – Wiring Diagram, ZPM3 to Loop Start Trunk
NOTE:
1. FOR CONNECTIONS TO TELEPHONE SYSTEM, SEE FIGURES 3, 4, & 5.
Figure 2 – Wiring Diagram, 48V Talk Battery