User's Manual

Draft
-8 5300 ES Series Mobile Radio Operating Manual December 2006
5.9.2 Emergency Calls
The Emergency Call feature allows a user to place an emergency voice call by pressing the
PTT switch after pressing the Emergency option button. If the Emergency Hot Mic feature
is enabled, the emergency call is automatically transmitted without having to press the
PTT switch (see following description). The system to which the emergency channel is
linked must have Emergency Calls enabled. Analog and Digital (P25) calls can be
individually enabled.
If the emergency call is sent on a P25 channel, an emergency indication is sent according
to the P25 standard (the emergency bit is set in the Common Air Interface). If it is sent on
an analog channel, the DTMF Emergency ID is sent in place of the ANI DTMF PTT ID if
applicable.
Note The DTMF Emergency ID is sent only if pre- or post- DTMF ANI is enabled on the
channel by programming.
5.9.2.1 Emergency Hot Mic
If Emergency Hot Mic has been enabled for emergency calls, automatic transmitting
occurs with microphone audio unmuted without having to manually press the PTT switch.
The automatic transmit period is programmed for 10-120 seconds in 10-second intervals.
If this feature or emergency calls are not enabled by programming, automatic transmitting
does not occur. This feature is initiated only on the first press of the Emergency switch.
Subsequent presses do not trigger automatic transmissions. To reset this function, the
channel must be changed or power cycled.
5.9.2.2 Placing an Emergency Call
1 If required, select a channel of a system on which Emergency Calls are enabled and
press the EMER option switch. The Emergency Alarm is then sent as described in
Section 5.9.1 if applicable.
2 If the preceding Emergency Hot Mic feature is enabled, the call is automatically
transmitted without pressing the PTT switch. If it is disabled, press the PTT switch and
begin speaking as with a standard call. If the channel is changed, operation continues on
the new channel in the emergency mode.
3 With analog calls, subsequent presses of the PTT switch cause the DTMF emergency
ID to be sent according to the ANI programming (if DTMF ANI is enabled on the
channel). With digital calls, the calls continue to have the emergency bit set.
4 If the Surveillance Mode is enabled (see Section 4.9), all indicators, lights, and tones
are disabled. If “No Receive Activity During Emergency” is programmed, receive
audio, the front panel LED, and receive icons are disabled in the receive mode.