TD 90227GB
10 October 2013 / Ver. D
System Installation
Ascom Paging System
1
1 Introduction
The units in the Ascom Paging System are designed for wall mounting, either adjacent to
each other or individually.
The units are housed in ABS plastic and provide protection against dust and mechanical
d
amage but should not be located in areas subjected to moisture or extreme humidity.
Operating temperature ranges are -25 to +55ºC for radio equipment and 0 to +40ºC for
ot
her modules. If possible, all units should be placed in dry locations with moderate
temperatures to facilitate service. Avoid locations that are subject to strong
electromagnetic fields, vibration, or rapid temperature changes. The procedure for the
installation of each unit is described in the installation guide for the respective unit.
1.1
PBX Private Branch Exchange
FL Frequency Lock
RI Receiver Interface
Abbreviations and Glossary
1.2 System Bus
The units communicate via serial transmission on the system bus. Adjacent units are
connected with a ready-made modular system bus cable. Twisted-pair cables are used to
connect remote units, such as a Transmitter located near the antenna, a number of
charging interfaces, etc.
S
ystem bus cable
T
wisted-pair cable
If the bus cable is used, no other system bus connections are needed. Twisted-pairs bus
connections are made at screw terminals on the PC-board. The bus network must never
form loops.
Data buses < 3 km
• All data buses are polarized.
• Maximum 32 modules to be connected in a bus network.
• The bus network must be open, never a loop.
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