Product manual

Installation instructions, Central Processing Unit (CPU2/SA) – REX-BRD9031 and REX-BRD9035
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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Chapter 7 Central Processing Unit (CPU2/SA) – REX-BRD9031
and REX-BRD9035
7.1 General
Maintenance
The CPU2 contains the following field-exchangeable parts (see figure Figure 21 on page 35):
• CPU2 poller firmware
• Lithium battery (LithiuMCell BR2325-1Hc)
The lithium battery is a back-up power supply for the real-time clock on the CPU2 board. This clock
updates the system date (year, month, day) and time (hours, minutes, seconds).
Note:
See warning about lithium battery in section ‘Safety and regulatory information’ in this manual.
7.2 Board description
Jumpers
• J4 synchronization jumper
• J13 battery activation jumper
When a DTU is used in the system, the framing of the digital trunk between PBX and the DCT1800-
GAP system must be synchronized. The jumper determines whether the CPU2 runs synchronous
with a host PBX or not. The jumper must be set as follows:
• No DTU used: Set the jumper to the ‘DCT1800-GAP master’ position.
• DTU is used and PBX is synchronised with a PSTN having a clock stability better than 2 p.p.m.:
Set the jumper to the ‘DCT1800-GAP slave’ position.
• DTU is used and PBX is not synchronized to PSTN: Set the jumper to the ‘DCT1800-GAP master’
position and synchronize the PBX to the DCT1800-GAP system. (Refer to the PBX
documentation). The reason for this is that the DCT1800-GAP system needs a clock stability
better than 2 p.p.m. for synchronization of both the air interface and the digital trunk.
Connectors
The CPU2 has the following front connectors (see figure Figure 21 on page 35):
• RS232 printer port
• RS232 personal computer port
• General alarm port
They are connected to a Modular Cabinet Connection Board (MCCB) via factory-installed cables.
Interface characteristics of printer and PC ports:
• Asynchronous, PC: 9600 bit/s (default), printer 9600 bit/s
• 8 data bits, 1 stop bit, no parity
• X-on/X-off