Vodavi STARPLUS Triad XTS, Installation Manual

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Product Description 1-11
Chapter 1 - Introduction
Message Waiting Unit
The message waiting unit (MSGU) provides a message waiting light indication on single line
telephones.
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One MSGU can be installed on each SLIB (required if message wait indication is needed).
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One or two MSGU48s can be installed on each SLIBE or SLIBC (required if message wait
indication is needed).
Program Module Unit
The CPU operates on code in the flash ROMs in the Program Module Unit (PMU) which contains
the system control, administration, and call processing. The PMU has 8 MB of ROM (4 MB in PMU
for MPB1).
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The PMU must be installed on the MPB.
Modem Unit
The Modem Unit (MODU) (Modulator & Demodulator Unit) provides a communication method
interface for remote maintenance and remote PC Admin. It operates in full-duplex,
asynchronous modes at line rates up to 19.2 Kbps.
The Modem Unit provides an asynchronous modem for access to the system database and fault
reporting features from a remote site. The modem may be connected to a pre-selected CO Line
through the system-switching matrix. The MODU port is independent of the SIU standard
RS-232C port, allowing system database access, etc., without the need to interrupt the SMDR
output.
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The optional MODU is installed on the MPB.
Relay Alarm Unit
The Relay Alarm Unit (RAU) provides three relay contacts and two alarm functions.
Serial Interface Unit
The Serial Interface Unit (SIU) provides an additional two RS-232C (ports 3 & 4) interface circuits
on the MISB. The SIU is useful for SMDR print out and Caller ID. The following is a list of the
system’s output:
On-line SMDR
Statistical information
Caller ID input
ACD
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The optional SIU can be installed on the MISB.