Bosch Security Systems, Inc.
Technical Manual
F.01U.193.228
Rev. 13
CHAPTER 1
Description & Specifications
Description
General
The MCE-325 is a 4-channel, programmable intercom station. It may be used as a headset station or, with the addition of the
MCS325 Modular Speaker, as a speaker station. It may be mounted in a console or equipment rack via optional mounting kits.
The MCE-325 can be used with either 2-wire or 4-wire intercom lines, or a combination of both. In this manual and in the
labeling on the MCE-325, references to CH 1, 2, 3, and 4 indicate 2-wire lines; references to 4-wire A and 4-wire B indicate
4-wire lines.
The MCE-325 can be interfaced to a variety of external devices including external program sources, 2-way radios, paging
systems, and satellite circuits. Some typical applications are shown in Figure 2 through Figure 10.
Features
Call Signaling
Call signaling is accomplished using an inaudible (20kHz) signal to activate a call indicator
LED.
Remote Talk-Off
Active, unattended remote station microphones may be deactivated by momentarily
injecting an inaudible (24kHz) signal into the corresponding intercom line. The MCE-325
can send and receive talk-off signals.
VOX Circuit
The MCE-325 may be programmed for voice activation of the microphone.
Simple IFB
Program audio assigned to a channel is interrupted during talk.
External Device Keying
External devices, such as two-way radios, speaker mute relays, or paging systems may be
activated through key outputs at the auxiliary connector on the rear panel. The key outputs
may also be used to expand the simple IFB functions, allowing any number of MCE-325
stations to interrupt the program source and talk on the line.
Microphone Limiter
The microphone preamplifier circuit contains a limiter, which helps to equalize voice levels.
Fully Programmable
Retains programming even when power is shut off.
