8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 123 of 153
Mixed DVR Mode
When a DVR channel is programmed to operate in Mixed mode, the DVRS can handle
calls from both P25 and analog local PSUs.
When Mixed Mode is selected, the DVR can be toggled between digital and analog Mode
as described below. The default DVRS mode is Digital i.e. the P25 modem is enabled by
default. If a Call from a Local PSU is detected and the DVR does not decode a P25 Frame
sync within the preprogrammed
‘P25 Frame Sync Detection Timer’
, the DVR switches
to Analog Mode and starts decoding Analog Mode signaling (such as DTMF, MDC1200
etc.). The DVR enables the repeat of Analog signals to the Local Analog PSUs. After the
Local PSU keys off, the DVR stays in the Analog Mode for the duration of the
preprogrammed
‘VR Ch Mixed Mode Hold Timer’.
Any Outbound calls which are
received by the MSU prior to the above timer’s expiration will be repeated by the DVR as
Analog Conventional. Once the
‘VR Ch Mixed Mode Hold Timer’
expires, the DVR
returns back to Digital Mode and any Outbound calls are repeated as digital.
The DVRS operation in Mixed Mode is determined by the settings of the
‘P25 Frame Sync
Detection Timer’
and
‘VR Ch Mixed Mode Hold Timer’
as programmed in the
Digital
System Setup
menu screen.
