Bogen PCMTBM Service Manual
Bogen Model PCMTBM
Talkback Module for Bogen's
PCM2000 Zone Paging System
© 2000 Bogen Communications, Inc.
Part No. 54-5948-01R2
Printed in Korea. 0009
PCM
TBM
POWER
VOLUME
TALKBACK
DELAY
ON
NOISE
REDUCTION
OFF
OUT
RT
IN
RT
PA
PA
PCMTBM
PCMTBM
Description
The Bogen Model PCMTBM is the talkback applications module for the Bogen
PCM2000 Zone Paging System.The PCMTBM is used with a high-power central
amplifier to provide talkback paging in zones with passive speakers.The module
is equipped with controls to adjust talkback volume and talkback delay. A noise
reduction switch mutes background noise when no audio activity is present in
the zone.
The PCMZPM zone module has TALKBACK dip switches which must be properly set in order to use the PCMTBM module. See the instructions supplied with
the PCMZPM module for further information.
Amplifier Connections
When using the PCMTBM module, connect the central amplifier input to PA IN
& RT terminals, and amplifier output to PA OUT & RT terminals. See the illustra-
tion on page 3. The central amplifier should have no connections to the PCMCPU module when using this talkback module.
NOTE: No connections should be made between the paging amplifier and the PCMCPU module.The paging amplifier must only be connected to the PCMTBM module.
Talkback Volume Control
TALKBACK VOLUME controls the loudness of the talkback signal in the telephone handset. Clockwise rotation increases the talkback level.
Talkback Delay Control
The TALKBACK DELAY controls the amount of time the unit stays in the broadcast mode (when paging is heard over the zone speakers). Once the paging signal stops, the unit will switch into talkback mode (listen through the speaker)
after this delay has lapsed.
Clockwise rotation of the control increases the talkback delay.
Noise Reduction Switch
When the NOISE REDUCTION switch is placed in the ON position, the
PCMTBM has the ability to mute background noise in the zone being monitored.
When audio activity in a zone is not changing significantly, the PCMTBM will
consider this audio to be background noise.The module will then mute the talkback channel.When voice is detected, the talkback channel will be immediately
reinstated. By placing the switch in the OFF position, the talkback channel will
not mute regardless of the audio activity in the zone.
2 3
Amplifier Connections
PCM
TBM
POWER
VOLUME
TALKBACK
DELAY
ON
NOISE
REDUCTION
OFF
OUT
PA
RT
IN
PA
RT
RINGER VOLUME
MUSIC MUTE
MUSIC VOLUME
MIC VOLUME
TEL VOLUME
ALC
CONTROLS
COM
TEL
MIC
+
AMPLIFIER
BRIDGING
MUSIC IN
TEL
MIC
BAL
TEL
CONTACT
BAL
RING
RING
GND
R
T
CLASS 2 WIRING ACCEPTABLE
GNDCOM25VCT25V16 70V
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