8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 113 of 153
‘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 steer 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.
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 proxy the call to the FNE. The DVR also updates its display to indicate the PSUs
Emergency Call condition. Upon PSU Cancellation of the Emergency Call, the DVRS will
clear its emergency display. The DVRS will also proxy the PSU emergency cancellation
to the P25 FNE. Emergency Hot MIC enables automatic emergency voice transmission
without having to press the PSU PTT. PSU Emergency Hot Mic is supported only on
‘DVRS Enabled’ PSUs. Only the ‘DVRS Enabled’ PSU waits for Emergency Alarm ACK
before requesting a voice channel. If Emergency Hot MIC is enabled in Generic P25 PSUs
(or ‘DVRS Enabled’ XTS PSUs with firmware older than R12.00.13), the PSU will send
emergency alarm and immediately enter the call phase, which prevents consistent
emergency processing. If the MSU interfaced to the DVR is placed in Emergency Call, the
DVR will proxy the call to all Local PSUs that are in the DVRS proxy list.
Emergency Revert through DVR
The DVR can be configured to revert 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. When the DVR receives emergency cancellation from the PSU, it steers the MSU
back to the original zone / channel, provided the MSU is not in emergency and the user
has not manually changed the MSU channel.
