Chapter 7: Gtr 8000 Base Radio Operation; Base Radio Operational States For Trunked Simulcast; Base Radio Operational States For Trunked Repeater And Hpd - Motorola ASTRO 25 GTR 8000 Manual

Chapter 7
GTR 8000 Base Radio Operation
This chapter details tasks performed once the GTR 8000 Base Radio is installed and operational on
your system.
7.1

Base Radio Operational States for Trunked Simulcast

GTR 8000 Base Radio modules can be in any one of the following four operational states:
• Standby
• Idle
• Assigned
• Isolated
During initialization, the base radio powers up into the standby state and waits for a status packet from
the comparator. When initial contact with the comparator has been made, the base radio enters idle
mode. The base radio sends a status message back to the comparator indicating that it is ready for the
assignment.
After a base radio has been assigned, it can begin to handle inbound/outbound traffic. In the case
where the base radio fails to receive status packets from the comparator, the base radio enters
isolated mode and dekeys. This isolated mode is reported in the Unified Event Manager (UEM).
If the base radio becomes operational again, and receives the status packets from the comparator, it
again replies with a channel status message. The base radio returns to the idle state and is ready for
an assignment from the comparator.
Adjacent Site Search Holdoff
For IP simulcast subsystems with 16 to 32 subsite capacity and geographically redundant prime sites
with 1 to 32 subsite capacity, the Transport Network requires longer than 1 second to recover following
a failure. To compensate for the subscriber unit scatter, the subscriber units are required to remain on
the site for a longer duration following a control channel loss. A message is used to instruct the
subscriber units to remain on the site for 10 seconds following the loss of a control channel. The base
radio automatically transmits this message upon loss of packets from the prime site.
7.2

Base Radio Operational States for Trunked Repeater and HPD

A GTR 8000 Base Radio can be in one of four operational states:
• Standby
• Idle
• Assigned
• Isolated
During initialization, the base radio powers up into the standby state and waits for a status packet from
the site controller. After initial contact with the site controller has been made, the base radio enters idle
mode and sends a status message back to the site controller indicating that it is ready for assignment.
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GTR 8000 Base Radio Operation
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