Programming instructions

PCMCPU

Two-Way Talkback Paging System with Satellites

Information relative to connecting the system to the telephone system can be found

in the instructions supplied with the PCMTIM module.

The illustration on the next page shows the wiring for a PCM2000 system with satel-

lites using talkback. This configuration is essentially the same as the one-way sys-

tem described previously, 4 pairs of wires connect between all adjacent PCM2000

assemblies. The main difference between the one-way configuration (previous ex-

ample) and this configuration, is that the centralized high-power amplifier is con-

nected to the PCMTBM module instead of the PCMCPU. All other wiring is the

same for these two configurations.

CAUTION: DO NOT connect the Paging Amp to the CPU Module when using

a PCMTBM Module.

The PCMZPM DIP switches for TALKBACK must be set to ON to enable talkback.

Talkback is only available in high-power zones with passive speakers.

NOTE: The PCMTBM module uses high gain amplifiers to provide the talkback for

speaker to amplifier. When using high-power BGM to provide uninterrupted BGM

in zones not being paged, some of this signal will leak into the talkback path and

be heard in the telephone receiver. One method to reduce this effect is to use the

25V output of the paging amp and high-power BGM source instead of the typical

70V output. Also reducing the amount of treble from the BGM source helps reduce

leakage.

NOTE: The Bogen PCM Configuration Guide contains more detailed

information on applications. It can be downloaded at: