Overview For A Gtr 8000 Base Radio Or Gpw 8000 Receiver In Conventional Architectures; Astro 25 Conventional Base Radio/Receiver - Motorola GTR 8000 Manual

GTR 8000 Base Radio
The HPD base radio uses Time Division Multiplex (TDM) frames for random access channels, reserved access
channels, and broadcast messages. All carriers in the system are synchronized by a Global Positioning System
(GPS) so that transmission slots are synchronized across sites. The base radio is able to schedule inbound/outbound
traffic for half-duplex MSUs so that outbound traffic intended for the MSU does not conflict with inbound random
or reserved access traffic from the MSU.
1.7 Overview for a GTR 8000 Base Radio or GPW
8000 Receiver in Conventional Architectures
Throughout this manual the term "conventional" addresses either an analog only base radio/receiver or an
ASTRO ® 25 Conventional base radio/receiver that operates in either digital mode or mixed (analog/digital) mode.
Conventional base radios/receivers operate within:
• an analog only infrastructure
• a Centralized or Distributed Conventional Architecture, or
• an ASTRO
Each conventional base radio/receiver uses either:
• a 2- or 4-wire TRC or 4-wire EM interface in an analog infrastructure
• a V.24 interface for digital voice and data traffic to either a Channel Bank, Digital Interface Unit, CCGW,
MLC 8000, or ASTRO-TAC 3000 Comparator and an optional 4-wire link for analog voice in a mixed
mode configuration
• an IP interface for digital voice and data traffic to a CCGW or GCM 8000 Comparator.
For information about conventional functions and topologies supported by the base radio/receiver, see the
Conventional Operations manual. Note that the base radio can be IP managed while using the 4-wire/V.24
interface for channel traffic.
A base radio/receiver can be implemented as a QUANTAR
conventional system. The implementation details can be found in the Quick Guide for Replacing a
Conventional QUANTAR with a GTR 8000 Base Radio manual.

1.7.1 ASTRO 25 Conventional Base Radio/Receiver

ASTRO ® 25 Conventional base radio/receiver features include:
• Separate Tx and Rx network access code
• Console or repeat priority
• Repeater set-up knockdown from the console
• Voice and data
• Control Messages (TSBK)
1-8
® 3.1 Conventional System.
® replacement within an ASTRO
6871022P86-A - November 2012
® 3.1