Primary / Secondary Dvr Basics; Table 13 Primary Dvr Definitions - Futurecom Mobexcom P25 User Manual

Primary / Secondary DVR Basics

In order to prevent interference and loss of communications when more than one active
DVRS are present at the same location and tuned to the same DVR Channel, a
sophisticated simulcast prevention algorithm is employed to ensure only one DVRS
repeats radio communications on the same DVR frequency at the same time.
While the algorithm is transparent to the User, on some occasions he/she may need to
be able to select (or simply be aware of) which DVRS is currently the 'Primary' and
which ones are 'non-Primaries'. Furthermore, a DVRS may be assigned to be a
Permanent Primary. A Permanent Primary always wins the voting algorithm. If more
than one Permanent Primaries are activated simultaneously, they vote to ensure only
one DVR remains as a Permanent Primary and the other(s) revert to standby mode. The
simulcast prevention algorithm ensures that there will always be one active Primary
DVRS regardless of when any of the DVRS arrive / leave the scene or are switched
ON/OFF.
An active DVR which
has won the voting
selection and has
been selected to
repeat Local PSU or
System
Communications.
DEFINITION
Transparent to the
User Selection via
DVRS voting
algorithm.
SELECTION
O5
Steady
DISPLAY

Table 13 Primary DVR Definitions

NOTE:
As an option, an external light may be placed on the top of the vehicle, which can be
used to indicate which DVRS is the currently selected Primary.
April 2014
PRIMARY
An active DVR which
was voted off and
forced to stay on
stand-by, without
repeating for as long
as the elected Primary
DVR is servicing the
communication needs
in the area.
Transparent to the
User Selection via
DVRS voting
algorithm.
V R
STANDBY
V R
Flashing
8A083X20 Rev. 16
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User's Guide
PERMANENT
PRIMARY
An active DVR, which
is forced by the User
or programmed to act
as a Primary. The
Permanent Primary
forces all other DVRs
in the area to assume
Secondary status. If
more than one
Permanent Primaries
are available in the
same area, they will
go through higher level
voting to elect one
winning Permanent
Primary among them.
Long press (3s) of the
VRS button on the O5
Control Head toggles
the Permanent
Primary Status ON
and OFF if this
selection is enabled in
the DVRS personality.
Steady V R
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