GTR 8000 Base Radio
The HPD base radio is implemented with 2X receiver diversity. This receiver diversity enhances the inbound signals
from the MSUs on the channel.
Figure 1-4
GTR 8000 Base Radios in HPD Remote Site
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 device 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
®
3.1 Conventional System.
1-8
6871022P86-B - July 2013
