User's Manual

20-466 Owner’s Manual
Page 11
When the scanner receives a transmission on a channel set to the Motorola mode, it first decodes the talk
group ID data included with the transmission. In the open mode, the scanner stops on the transmission
and displays the talk group ID on the bottom line of the display. In the closed mode, the scanner only stops
on the transmission if the talk group ID matches a talk group ID that you have stored in the bank’s talk
group ID list and have not locked out.
Motorola trunking systems come in three categories: Type I, Type II, and Type I/II Hybrid. Each category
displays and uses talk group IDs in slightly different ways.
Motorola Type I IDs are in the form FFF-SS, where:
FFF=Fleet ID
SS=Subfleet ID
Type I systems are usually organized with different user groups assigned to different fleets. For example, a
valid fleet/subfleet ID identifying all detectives within a police department might be 000-12, where 000
identifies all police users and 12 identifies the Detective division.
To properly map the raw Type I data to the correct fleet-subfleet format, you must program the correct fleet
map into the scanner. Fleet map information is widely available on the Internet for most Type I systems in
use.
Type II system talk groups are identified by a 5-digit number. Valid talk group IDs are divisible by 16. If you
try to enter an invalid talk group ID, the scanner rounds the ID down to the next valid ID.
Type I/II hybrid systems use both fleet-subfleet and 5-digit formats for talk group IDs.
Note: If the scanner decodes control channel data while receiving transmissions from a Motorola trunking
system, CNTRL appears on the bottom line of the display.
EDACS Mode
You can set your scanner so it decodes the talk group IDs used with EDACS (GE/Ericsson) trunking
systems. This setting is called the EDACS mode.
EDACS systems are trunking systems used primarily by business or private communications service
providers, as well as by some public safety organizations. EDACS systems transmit active talk group
information only on a dedicated control channel.
EDACS frequencies are organized in a specific order. Each frequency is assigned a Logical Channel
Number (LCN). For the scanner to correctly switch to an active frequency, you must program the
frequencies in LCN order, starting with Memory 01. EDACS talk group IDs are entered as a 4-digit decimal
number from 0001 to 2047 or AFS (Agency Fleet Subfleet) number from 00-001 to 15-157.
When there is activity on an EDACS system, that information is sent out on the control channel. The
scanner decodes the ID for the active talk group. In the open mode, the scanner then goes to the
transmission and displays the talk group ID on the bottom line of the display. In the closed mode, the