TD 91684GB
16 April 2015 / Ver. G
Installation Guide
T942C and T942C/2 Central Unit
1
1 Central Unit T942C
T942C is used in the Ascom Paging System. T942C controls all communication on the
system bus and data buses. The Central Unit also generates code to all H/U952T Terminal
Transmitters and enables parallel operation of separate installations. All the inputs and
outputs have transient protection, and all bus connections are equipped with chokes for
increased EMC protection.
Figure 1. Central Unit T942C.
Supply voltage: 12.5 V DC
± 10 %
Current consumption: Max 1 A
IMPORTANT: Protect the unit against current exceeding 20 A. Use power cables with
cross-section 3 mm
2
.
NOTE: For 541293A, rev. 3A or later, and
T942C2, rev 2A or later:
Ferrite beads must be mounted on all cables to fulfill EMC regulatory
re
quirements (see figure 2).
Figure 2. Central Unit with cover removed and ferrite beads mounted on cables.
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