SmartTrunk Systems SmarTrunk II, Обзор системы, Страница: 11 / 57

11 SmarTrunk Systems, Inc.
Types of Calls and
Methods of Operation
Using SmarTrunk II For Radio Dispatch Applications
Mobile to Group Call
S
EQUENCE OF EVENTS
:
1. Mobile subscriber presses the PTT (Push To Talk) button to initiate a
group call to the subscriber’s own group. Alternatively, mobile sub-
scriber enters desired group number followed by routing code 3 and *
on the radio keypad.
2. Mobile radio searches for an idle channel and signals the controller.
3. Base station controller acknowledges the mobile and signals all
subscriber radios that are a part of the called group.
4. Subscriber radios assigned to the called group open squelch, con-
nection is established, and a group conversation begins.
5. Any subscriber in the group presses the “#” key to terminate the call,
or repeater disconnects at the expiration of the Group Activity Timer.
S
PECIAL FEATURES
:
¨
Automatic PTT (Push To Talk) Mode - subscribers may initiate
group calls to their own subscriber group by pressing the PTT button.
¨
Call Limit Timer - programmable call limit timer on a per user
(group) basis.
¨
Group Activity Timer - acts like a “hang timer” to retain channel for
the duration of a call.
¨
Multiple PTT Group can be selected without keypad in some radios
(see Omni Features, Section 6).
¨
Memory Speed Dial - convenient, cellular like, dialing including a re-
dial function.
¨
Clear Channel Alert - notifies the subscriber when a channel be-
comes available after the subscriber has attempted to access the
system when all channels are busy.
¨
Radio Kill - eliminates unauthorized users of the system.
¨
Conventional Mode Operation - “talk around” communications
available in certain subscriber radios.
3 SECTION