July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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mobile radio systems. The system uses fast frequency shift keying
(FFSK) at 1200 bit/s with time division random access. The mobiles
operate two-frequency semi-duplex and the base stations or trunking
system controller (TSC) operate full duplex. A calling channel is used
for call establishment but may be either dedicated or nondedicated.
After a call is established messages are transmitted over a traffic
(working) channel. The basic components of the signalling format,
in sequence, are:
1. The link establishment time (LET), a period of transmission of
undefined modulation.
2. A preamble comprising a sequence of bit reversals 1010...10, min-
imum 16 bits and ending with a binary zero for the receiver data
demodulator to achieve synchronization.
3. A
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