User's Manual

o Portable Priority Interrupt is disabled
o VRS TOT disabled
o TX PL is disabled.
To exit the test mode, the system needs to be reset after removing the test mode jumper.
Non-Priority VRS Rules
A priority VRS is placed into non-priority mode when one of the following occurs:
1. It receives a Single Tone burst at the fixed frequency of 847.5 Hz.
2. During a base-to-portable repeat, it receives a VRS/portable frequency RF signal
without proper PL during the PPI.
When a VRS goes from priority to non-priority, the internal delay state changes from 0 to
1. Upon subsequent reception of Single Tone bursts (that is, other VRS units activate in
the same coverage area), the non-priority unit will increase delay states up to a maximum
of 7. While in non-priority, the following occur:
Portable-to-Base Non-Priority Operation
1. Upon reception of a portable frequency RF signal with proper PL, the VRS will
determine if the mobile of another VRS system is repeating the signal.
2. For the prioritization routine to function, all of the mobiles with a VRS must be
able to receive other mobile transmissions, either directly (TX=RX), or on a trunked
system (TX?RX), or through a base repeater (TX?RX) in conventional modes with the
<Base Repeater> feature enabled. For conventional non-repeater dispatch systems
(TX?RX), the Mobile Detector must be enabled for the prioritization routine to function
properly.
3. The VRS will determine if the mobile of another VRS system is repeating the
portable signal by steering the mobile to the mode corresponding to the received PL. If,
within one delay state (at least 600 ms for conventional, at least 900 ms for <Base
Repeater>, and at least 1.5 seconds for trunking), the mobile in the non-priority VRS
system does not receive the repeated signal, it will countdown from the current delay
state.
4. Upon reaching delay state 0, the non-priority VRS will become the priority VRS
and start repeating. The maximum delay for a non-priority VRS to countdown into
priority is 4.2 seconds for conventional, 6.3 seconds for <Base Repeater>, and 10.5
seconds for trunking.
5. If the VRS does detect another VRS system repeating within the delay state, it
will stop the countdown process and stay non-priority.
Base-to-Portable Non-Priority Operation
1. Upon reception of a repeatable base signal, the non-priority VRS will monitor for
a VRS-to-portable transmission from another VRS system (that is, a signal on the
portable frequency without proper VRS access PL).
2. If, within one delay state, the VRS does not receive the repeated signal, it will
countdown from the current delay state.
3. Upon reaching delay state 0, the non-priority VRS will become the priority VRS
and start repeating. The maximum delay for a non-priority VRS to countdown into
priority is 3.4 seconds for conventional and 5.8 seconds for trunking.