Uniden UBCD996T Owner's Manual download pdf (Page 26)

to the assigned voice channel and the user can begin speaking. This all typically

takes place in about a second...the person transmitting hears a beep from their radio

when the channel is assigned. Then it is OK to start talking.

The systems in use are:

Motorola Type I — the radios send the radio ID, the fleet and subfleet talk group ID

to the control channel each time they transmit. To program a Type I system, you

need to know the system’s . The most common fleet maps are included in

the Reference section in this manual. You can also find fleet map resources on the

web such as at .

— the radios only send the radio ID and radio channel code to the

control channel. The central computer keeps a database of radio ID’s and which talk

group is assigned to which channel code for each radio, so with this system the

user’s radio sends only about / the data as a Type I system with each transmission.

Type II systems do not use Fleet-subfleet talk groups; instead they use a 5-digit ID

for each talk group.

— 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.

— these radios are similar to Type II systems, but

send only the radio ID and radio channel code to the control channel, transmitting

voice in digital form.

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. Talk groups are assigned in an Agency-Fleet-Subfleet (AFS)

hierarchy.There is one variation of EDACS called SCAT that your UBCD996T 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.

— 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

fleet map

http://www.radioreference.com

Motorola Type II

Type IIi Hybrid

Motorola ASTRO 25 (APCO 25)

Agency-Fleet-Subfleet

EDACS Trunking

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Uniden UBCD996T Owner's Manual Page 26

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