Tyco Electronics P5300 9.21 EMERGENCY OPERATION , 9.22 INDIVIDUAL CALLS

signal quality of the control channel for each site in its adjacent scan list. (The signal quality metric used

for the ProScan algorithm is based on a combination of both Received Signal Strength Indicator (RSSI)

and Control Channel Verification (CCV) measurements.) When the selected system degrades to a pre-

programmed level, the radio will begin to look for a better control channel. Once a control channel that

exceeds the pre-programmed parameters is found, the radio will change to the new system and emit a tone

(if enabled through programming). If the control channel is completely lost, the radio will enter Wide

Area System scanning and search the programmed adjacent systems until a suitable control channel is

found.

9.21 EMERGENCY OPERATION

The radio's ability to declare an emergency, clear an emergency, remain locked on an emergency system

and group, and the emergency audio and display freeze can each be enabled or disabled through

programming. When an emergency is declared scanning will stop and restarts only after the emergency

has been cleared.

When receiving an Emergency Call on the selected group and system, an alert beep is heard and is

displayed. The message *RXEMER* flashes in the display on line two until the emergency condition is

cleared.

Perform the following steps to send an emergency call to a selected system and group (or on an optionally

pre-programmed group).

1. Press and hold the red EMERGENCY button that is on top of the radio in front of the antenna for

approximately one second (this time is programmable and therefore could be longer or shorter; check

with the system administrator). The radio will transmit an emergency call request with the radio ID

until an emergency channel assignment is received.

2. When the working channel assignment is received, the radio sounds a single beep indicating the radio

has auto keyed (see Table 9-3) and is ready for voice transmission. *TXEMER* flashes on line two in

the display until the emergency is cleared.

3. Press PTT and speak into the microphone in a normal voice. and momentarily turn ON.

4. Release PTT when the transmission is complete.

To clear the emergency first press and hold the button. While continuing to hold the button, press the

EMERGENCY button. (This will work if the radio is programmed to clear emergencies.)

9.22 INDIVIDUAL CALLS

When the radio receives an individual call (a call directed only to the user's radio), it un-mutes on the

assigned working channel and displays . The first line on the display shows the logical ID number of the

unit sending the message, or the associated name if the ID number is found in the individual call list. The

radio can be programmed to ring when an individual call is received. If enabled, the ring begins five

seconds after the caller un-keys and will continue until the PTT button, the button or the individual call

mode is entered.