GTR 8000 Base Radio
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. The site controller responds
with a channel grant message, and the base radio enables for service. If the base radio has a greater home channel
preference setting than other base radios at the site, then the zone controller assigns the base radio as the home
channel at the site.
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 a number of consecutive status packets from the site controller, the base radio enters
isolated
mode and dekeys. This isolated mode is reported in the Unified Event Manager.
If the base radio becomes operational again and receives status packets from the site controller, it replies with a
channel status message. The site controller may then respond with a channel grant, and the base radio becomes
enabled for service again.
7.3 Base Radio Operational States for Conventional
A GTR 8000 Base Radio can be in one of two operational states:
• Standby/Receiving
• Transmit
During initialization, the base radio powers up into the
standby/receiving
state and is enabled for service. The base
radio listens for any received transmissions.
After the base radio has received a transmission, it can then key-up and
transmit
.
The GPW 8000 Receiver does not transmit.
7.3.1 Packet Data interactions with Multiple NAC’s
If a base radio supports multiple NAC’s, such as when using the community base radio feature (F7F/F7E), in
addition to a default NAC, inbound data can be received on any incoming NAC and is forwarded to its destination.
Outbound data is only transmitted to the default NAC. Outbound data cannot be routed to a selected NAC, it is
always sent on the default NAC. Repeated data is only transmitted on the default NAC and does not follow the
inbound NAC when community repeater (F7F) is being used.
7.3.2 Supplementary Signaling interactions with Multiple
NAC’s
If a base radio supports multiple NAC’s, such as when using the community base radio feature (F7F/F7E), in
addition to a default NAC, inbound supplementary signaling can be received on any incoming NAC and is
forwarded to its destination. Outbound supplementary signaling is transmitted on either the default NAC or the
currently selected NAC if using F7F/F7E, the same that voice would be transmitted. Outbound supplementary
signaling cannot be routed to a selected NAC, it is always sent using either the default NAC or the same NAC that
voice would be transmitted on according to F7F/F7E functionality.
7-2
6871022P86-A - November 2012
Summary of Contents for GTR 8000
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