Specifications

Product Description 1-11
Chapter 1 - Introduction
XTS-IP - Installation Manual December 2005
Add-On Boards
This section describes add-on boards, which can be installed on various types of boards to
support additional functions as shown in the following table.
Dual Tone Receiver Unit
The d ua l t on e r ec eiver un it (D TR U) pr ov id es Du al Tone Multi frequency (DTMF) circuits. The two
versions of the DTRU are: the DTRU and the DTRU4.
 The DTRU can be installed on the DIDB to provide 2 DTMF circuits.
 The DTRU4 can be installed on the LCOBC, SLIBE, T1IB, or PRIB to provide 4 DTMF circuits.
Message Waiting Unit
The message waiting unit (MSGU) provides a message waiting light indication on single line
telephones.
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).
» The PMU must be installed on the MPB.
Table 1-3: Add-on Boards
Board Function Position
CIDU Caller ID Unit LCOBC
DTRU Two DTMF receiver circuits DIDB
DTRU4 Four DTMF receiver circuits LCOBC, SLIBE, T1IB,
PRIB, & BRIB
MSGU48 Provides message waiting light indication on SLTs SLIBE & SLIBC
PMU Provides operating software MPB
MODU Provides a 19.2K baud modem for local access MPB
RAU Provides three relay contacts and two alarm
functions (not used)
RAU
SIU Provides additional two RS232 serial interfaces. MISB
The resources above are shared across the entire system.