8A083X30 Rev.11
APX Series P25 Interface
DVRS
User’s Guide
January 2019
Page 75 of 94
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.
Analog Audio Buffering
Audio buffering is supported by the DVRS in order to eliminate loss of messages / parts
of messages due to the inherent delays associated with acquiring system access. The
analog buffer is programmable in the DVR (up to 1300ms).
Tactical Public Safety (TPS)
The TPS feature allows analog subscribers to send digital PTT ID information on an
analog channel with analog voice. TPS is only supported when the DVR is on an analog
channel in the SYSTEM mode and the MSU is configured for analog transmit (without
any signaling) and with Mixed receive.
Fireground (FG) Signaling
The Fireground deployment consists of a fleet of subscribers communicating with an
incident commander position using digital signaling and either analog or digital voice.
If Fireground (FG) signaling is enabled in the local PSUs and on the selected full duplex
DVRS channel, the DVR repeats locally the FG messages received from the Local PSUs
to the FG terminal.
FG Emergency signaling received from the Local PSU can be either repeated locally,
sent to the system or both (as programmed in the DVR).
NOTE:
Only Generic P25 PSUs support Fireground operation.
