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8A083X30 Rev.11
APX Series P25 Interface
DVRS
User’s Guide
January 2019 Page 49 of 94
P25 Digital Mode Operation
This chapter provides details on the DVRS Digital P25 mode of operation.
The P25 Digital mode assumes the following:
•
APX MSU Programmed for DVRS Operation
•
P25 FDMA/TDMA only mode is selected on the MSU.
•
P25 PSU programmed for DVRS operation (Local PSU).
•
DVRS Enabled mode selected on the Local PSU.
•
DVR channel is programmed in the DVR for Digital (or Mixed) Mode of
Operation.
NOTE:
The Local PSU notation throughout this chapter refers to a P25 PSU which is used to
communicate with / through the DVRS.
‘DVRS Enabled’
type Local PSU refers to the models described in Table 6 when
programmed for DVRS operation.
Some of the Digital mode
DVRS features described are only available in P25 ‘DVRS
Ena
bled’ type PSUs and not available in Generic P25 PSUs (refer to
Table 6 ).
A
System PSU refers to a P25 PSU which has a P25 Mode (Trunking or Conventional)
selected and communicates directly with the P25 Trunking or Conventional System, i.e.
without a DVRS.
In in-band DVRS applications, the
Local and System PSU s may be of the same model
and personality. When a ‘DVR Enabled’ P25 Mode is selected, the PSU is referred to as
Local PSU . When a P25 System TG / Channel is selected, the PSU is referred to as
System PSU .
In cross-band DVRS applications, the
Local PSUs operate in different frequency band
from the system infrastructure, i.e. from the System PSUs .