8A083X30 Rev.11
APX Series P25 Interface
DVRS
User’s Guide
January 2019
Page 61 of 94
Emergency in Digital Mode
The ‘DVRS Enabled’ P25 PSU can be programmed to block the launch of the
Emergency feature if the P25 Trunking system is in failsoft mode (when ‘Emergency
Blocked in Failsoft’ is enabled). The ‘DVRS Enabled’ P25 PSU can be programmed to
use the programmed
‘Fallback Revert Talkgroup’ while in Emergency and when on the
Dynamic Talkgroup channel without an assigned dynamic working group.
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.
•
During Emergency Call, the unit ID of the local PSU, which has initiated the
Emergency Call, may be displayed on the system PSUs / MSUs if those 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 but 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.
•
If a DVRS is on a
‘VR Disabled’ Mode and it receives an Emergency from a local
PSU with a valid steering NAC then after the
‘Attempts Counter’
is exceeded,
the DVRS will ste
er to the corresponding ‘VR Enabled’ MSU mode, switch to
SYSTEM mode, 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.
