Futurecom Mobexcom P25 Installation & Programming Manual page 59

Field Name Options
/ Units
Tx RSSI Th -60 to
-110dBm
Rx RSSI Th -60 to -
110dBm
Bandwidth Set 1
Set 2
Steering
Yes
No
Digital Vehicular Repeater Interfaced to XTL
April 2014
DVRS Installation & Programming Guide – PART II
Description
When a Secondary DVR detects a
request for DVR repeat and it does
not detect any Heart Beats coming
from the current Primary DVR, the
Secondary DVR checks for activity
on its Tx frequency (exceeding the
Tx RSSI Th) to determine if the lack
of Heart Beat is due to the Primary
DVR already repeating the Call. If
no activity is found to exceed the
RSSI Th the DVR will check again
and if 3 heart beats are missed, the
DVR will negotiate becoming a
Primary.
The DVRs exchange
Primary/Secondary messages on
their Rx frequency while idle.
Before a Primary DVR sends out a
Primary Heart Beat (HB), it checks
for RF activity and HB exceeding
the programmed 'Rx RSSI Th' on
the Rx frequency. If the Primary
DVR does not detect any RF
activity or HB exceeding the 'Rx
RSSI Th', it will proceed with
sending a Primary HB. If it detects
HB exceeding the programmed 'RX
RSSI Th', the Primary DVR backs
off and becomes non-Primary, on
stand-by. If a HB is detected but its
level is below the programmed 'Rx
RSSI Th' the DVR will stay a
Primary and send its HB. If it
detects RF activity on the Rx
frequency, the Primary DVR will
postpone the sending of its HB until
the Rx frequency is clear to ensure
the HB can be successfully (without
interference) received by the other
DVRS.
Selects the Adjacent channel
spacing (12.5kHz or 25KHz) as
programmed in the 'Frequency
Band Setup' menu.
Enables ('Yes') or Disables ('No')
portable initiated steering of the
MSU mode (zone/channel). Based
on the PL/DPL programmed in the
PSU and received by the DVR. The
DVR steers the MSU to the
zone/channel that is associated
with a specific Rx PL/DPL
programmed in the DVR Steering
Table.
TM
5000 (O3 or O5) or XTL
8M083X01 Rev. 16
6881013Y39
Notes
Refer to the Primary /Secondary
Operation Paragraph for more
details.
Tx
Refer to the Primary /Secondary
Operation Paragraph for more
details.
See 'Frequency Band Setup'
Screen.
Applicable to Analog DVR Modes
only.
TM
2500 (M5)
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