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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dropouts but with message trunking the channel is retained for a longer
period of time to allow the complete conversation to take place. On
a very busy system this is wasteful and, on a system with very rapid
signalling, transmission trunking may be used. Then the use of the
working channel is lost very soon after the cessation of transmission
and a new working channel assigned on its resumption. Some net-
works automatically migrate from message trunking to transmission
as traffic increases.
17.3 In-band interrupted scan (IBIS) trunking
IBIS trunking is a method which is finding favour for common base
station applications. All channels are used for communication with no
dedicated calling channel, thus making the most effective use of the
channels
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