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27
Understanding Scanning
subfleet talk groups; instead they use a 5-digit ID for
each talk group.
Type IIi Hybrid — these systems support a mix of both
Type I and Type II users. Like Type I systems, you
must know the system’s fleet map to ensure proper
tracking.
EDACS Trunking
EDACS trunking works in much the same way as
Motorola trunking with a couple of major differences.
In an EDACS system, each frequency used by the
system is assigned a Logical Channel Number (LCN)
so that less data needs to be transmitted by the
control channel. Also, talk groups are assigned in an
Agency-Fleet-Subfleet (AFS) hierarchy. Also, there is
one variation of EDACS called SCAT that your
BR330T can monitor.
Logical Channel Numbers – each frequency used by
the system is assigned an LCN. This information is
programmed into each user radio. When a user
presses PTT, their radio sends their AFS information
to the control channel. The computer then assigns that
talk group to a channel and sends the LCN so that all
other radios in that talk group will switch to the correct
channel. To program an EDACS system in your
scanner, you will need to know both the frequencies
used by the system and the LCN for each frequency.
Agency-Fleet-Subfleet – talk group ID’s for EDACS
systems are assigned in a way that makes it easy to
see at a glance the affiliation of the user. Each radio is
assigned a 2-digit agency identifier from 00 – 15.
For example, 01 might be used by the police, 02 by
the ambulance service, 03 by the fire department, and
so on. Each agency is then subdivided up to 16 times
to provide fleet identification, and then 8 more times to
identify subfleets.
For example, the complete AFS for the Police
Department West District’s dispatch channel might be