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08905106B - 2 -
1. Power supply connection. Be sure to use the included power supply only.
2. Doorbell Switch Input (lighted or non-lighted). Provides door chime over speakers (not
polarity sensitive). This input can also be connected to a DCH4 for a unique front / back door
chimes.
3. C.O. / Phone Line Input.
4. Line Out to Phones.
5. Page Trigger Output. Connect to the MRC88CTL requiring 12VDC signal (or dry relay contact
closure) for enabling the paging source input.
6. Music on Hold Input. (mono, 1/8”, 3.5mm) Line Level input from radio, etc.
7. Left and Right Audio Loop Input. (stereo, RCA-type) Line level pre-amp input for
background music, etc.
8. Left and Right Audio Output. (stereo, RCA-type) Line level output to external amplifier or
MRC88CTL.
9. DIP Switches. For on-hold alarm and mode selections.
DIP SWITCH PROGRAMMING
SWITCH POSITION DESCRIPTION
1 OFF On-hold alarm disabled.
1 ON
On-hold alarm tone enabled, a double beep each
minute a call is on hold (factory default).
2 OFF
Doorbell input connected to a typical doorbell switch
(factory default).
2 ON
Doorbell input connected to a DCH4 N.O. auxiliary
contact output.
Note: Place DIP switches in the desired position then momentarily power down the unit.