8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 119 of 153
Emergency Alarm
When an affiliated local PSU issues an Emergency Alarm, the active Primary DVR will
process the emergency to the system as follows:
•
If the
‘Portable ID Display’
box (in the DVR
Emergency Mode Setup
) is checked,
the Local PSU Unit ID will be displayed on the MSU control head of the current
Primary DVRS.
•
The PSU Unit ID will also appear on the display of the other local PSUs if they are
programmed accordingly.
•
The local PSU ID during Emergency may also be displayed on the dispatcher
console.
•
The DVR sends back an Emergency ACK to prevent the PSU from re-sending the
Emergency either right after the DVR decodes the Emergency request (if the
‘System Acknowledge Type’
on the
Mobile Radio Channel Settings
menu is
set to
“VR Ack”
) or after FNE ACK has been received (if the
‘System
Acknowledge Type’
on the
Mobile Radio Channel Settings
menu is set to
‘Site
Ack’
or
‘Console Ack’
).
•
All Secondary DVRS in the area are monitoring the number of emergencies issued
by local PSUs according to the
‘Attempts Timeout’
and
‘Attempts Counter’
settings programmed in the DVRs
Emergency Mode Setup
. If the number of
detected not serviced Emergency Attempts exceeds the counter, the Secondary
DVRs will go through Primary / Secondary voting to select a new Primary to pass
the emergency to the system.
•
If a DVRS is in the OFF mode when it receives an Emergency from a local PSU,
the DVR will switch to SYSTEM mode after the
‘Attempts Counter’
is exceeded,
affiliate the PSU and pass the Emergency to the system.
The PSU Emergency attempts counter must be programmed to be equal to the DVRS
‘Attempts Counter’
plus 3.
Emergency Call
Emergency Call operation provides the user with access to a voice resource on a priority
basis. The user’s Emergency Call has priority over all other types of call traffic. Upon
receipt of an Emergency Call from a local PSU, the DVRS will process the call locally as
well as proxy the call to the FNE. On Type II Trunking systems, the PSU Emergency Call
will be proxied with the
MSU Emergency ID
, NOT the PSU MDC ID. The DVR also
updates its display to indicate the PSUs Emergency Call condition.
Emergency Revert through DVR
The DVR can be configured to revert the local PSUs that have entered emergency by
mode steering the MSU to a preconfigured zone/channel. When the DVRS is programmed
for emergency revert and the MSU is not already in Emergency, the DVR steers the MSU
to the preprogrammed zone/channel upon receiving and Emergency Alarm / Call from the
PSU. The emergency revert condition can be configured as permanent or timed. If
configured as timed then the DVR will revert the MSU back to the original channel after
the emergency inactivity timer expires without inbound or outbound activity.
