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4
SM-III Plus Installation and Operation Manual
DESCRIPTION
PRODUCT DESCRIPTION
The Broadcast Tools® Silence Monitor III Plus improves on the features of the orig-
inal Broadcast Tools® SSM. The Silence Monitor III Plus is designed to monitor
any stereo or two independent monaural sources, generate alarms and transparently
switch to back-up source equipment when silence is detected. Features include:
front panel, remote control and relay monitoring; Plug-in euroblock screw terminals;
“Plug & Play” (NO POTS) installation; dipswitch selection of silence detection of
–23, –25, –35 and –45db; precise time delay from 2 seconds to 85 minutes; precise
restore timing delay from off to 42 minutes; defeatable sonalert aural alarm; relays
for most remote functions. The SM III Plus may be set on a desktop, mounted on a
wall or optional RA-1 rack shelf for mounting up to three units in 1-RU.
PRODUCT FEATURES
• Transparent stereo or dual monaural program switcher with front panel switcher
transfer switch and indicator LED.
• Dipswitch selection of silence detection of –23, –25, –35 and –45db
• Precise time delay from 2 seconds to 85 minutes
• Precise restore timing delay from off to 42 minutes
• Active balanced inputs
• May be configured for stereo or dual independent monaural operation
• Front panel switcher transfer switch
• Front panel “Mute” switch with built-in sonalert and remote defeat input
• Front panel “Manual/Automatic” switch with front panel LED, remote input and
relay
• Front Panel Alarm “Reset” switch, Tripped LED and relay
• External (“Ext”) alarm input with front panel indicator and relay
• Front Panel Power LED
• Two independent audio alarm relays
• Two pulse open collector alarm outputs
• Auxiliary SPDT relay with user configuration of pulse and
• Plug-in euroblock screw terminals
• The SM III Plus may be set on a desktop, mounted on a wall or optional RA-1 rack
shelf for mounting up to three units in 1-RU
