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Miscellaneous Interface Unit Installation
Miscellaneous Interface Unit Installation
The Miscellaneous Interface unit (MISB) contains an External Music port (MOH/BGM), an
External paging port, and four dry contacts. Optionally, the MISB is equipped with two serial
interface ports by installing the Serial Interface Unit (SIU) daughter board. The SIU should be
installed if more than two serial communication devices are to be connected to the system.
Connectors / Switches
The MISB consists of:
External page ports from the amphenol connector on the front edge of the MISB. These
ports are connected to transformers, providing a 600 ohm impedance.
Music inputs from the amphenol connector on the front edge of the card.
Four independent relay contacts through the amphenol connector on the front edge of
the MISB. These contacts are controlled by software from entries in the system database.
Control signals are sent by the MPB. The output drives the relay coils, controlling the state
of the 1 amp, 24V relay contacts.
Figure 3-12: LMU2 Board Configuration
Table 3-3: MISB Connector Functions
CN1
SIU Connection
RJ21X
RJ21-type female connector (25-pair Amphenol) for
External Paging, External MOH, Relay contacts, and
Alarm Input
The MISB should be inserted into slot 8, Cabinet 0.
Use extra care when removing RS-232 cables from the MPB or SIU boards. Hold the
MPB/MISB card in the card slot before removing the RS-232 cable. Failure to perform
this action may result in the MPB/MISB card being pulled from its slot.
Chapter 3 - System Installation
Function
3-19
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Troubleshooting
