8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 107 of 153
PSU Talk Permit Tones
‘Go Ahead’ tones are generated in the ‘DVRS Enabled’ PSUs.
Different tones are generated to indicate if the DVRS is in LOCAL or SYSTEM mode or
the call is P25 Encrypted. As a programmable option LOCAL mode tones can be
generated when the system is busy and only local repeat is available. Alternatively, the
PSU user can get ‘System Busy’ tones and be forced to wait for system grant (see
‘Digital
System Setup Menu’
in the
DVRS Programming
section). Generic P25 PSU mode does
not support Talk Permit Tones when operating through the DVRS.
Status Broadcast
If enabl
ed in the DVR (“
Network Status Reporting Interval
”
, Digital System setup
screen), the DVR transmits status broadcasts that can be decoded only by P25 DVRS
Enabled PSUs:
•
FNE Out of Range
•
DVR Local only status
•
Site Trunking
•
Failsoft
•
IV&D Enabled / Disabled status
NOTE:
Only a
Primary
DVR can transmit Status Broadcasts.
The above status indication is not available to Generic P25 PSUs when using the DVRS.
The status indication is passed to the Local PSU every time the status changes. If there
is no change to the status, the DVRS sends status indication to the Local PSUs at a
preprogrammed time interval. The DVRS also sends a network status notification every
time a Local PSU is affiliated with the System via DVRS. If the FNE enters Failsoft mode,
the MSU proxies the Failsoft message (if Failsoft is enabled in the MSU). The DVR stops
sending status broadcast to the local DVRS Enabled PSUs and periodically transmits
Failsoft message instead.
Local Mode Indication
When the DVRS is operating in the Local Mode, the DVRS Enabled PSU User can see
“
LOCAL ONLY
” message displayed on the PSU screen if status broadcast is enabled in
the DVR as described in the ‘Status Broadcast’ paragraph. The above indication is only
available on ‘DVRS Enabled’ P25 PSUs and is not available to Generic P25 PSUs.
Radio Check / Inhibit
Radio Check and Radio Inhibit functions are passed through the DVRS to the Local PSU
when the DVRS is in the SYSTEM or LOCAL mode. Those functions are available to both
‘DVRS Enabled’ and Generic P25 PSUs when the MSU is operating on a P25 trunked or
P25 conventional mode. If the MSU gets inhibited
, the DVR switches to ‘VR Disabled’
mode of operation.
P25 Trunking OTAR
P25 Over The Air Rekeying (OTAR) is supported through the DVRS when the local PSUs
are of the ‘DVRS Enabled’ type, the DVRS is in the SYSTEM mode and the MSU is on a
