Base Radio Operational States For Conventional; Packet Data Interactions With Multiple Nacs; Supplementary Signaling Interactions With Multiple Nacs; Illegal Carrier Determination Feature (Trunked) - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 7: GTR 8000 Base Radio Operation
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.
7.3.1

Packet Data interactions with Multiple NACs

If a base radio supports multiple NACs, 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 NACs

If a base radio supports multiple NACs, 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. If using F7F/F7E, the same that voice would be transmitted,
the outbound supplementary signaling is transmitted on either the default NAC or the currently selected
NAC. 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.
7.4

Illegal Carrier Determination Feature (Trunked)

The Illegal Carrier Determination feature allows base radio channels to continue operating with system-
configurable levels of channel interference. In an ASTRO
210
® 25 system, the base radio uses Received