Specifications

R4-11-4G Wireless Data Communications Network 1-1
Chapter 1
Wireless Data Communications Network
This chapter describes the Private DataTAC™ wireless data®
communications network. The sections in this chapter are:
• What is Private DataTAC?
• Basic System Topology
• Private DataTAC System Features
• Fixed-End Equipment
• Wireless Computers
• External Radio Modems
• Private DataTAC System Performance
1.1 What is Private DataTAC?
Private DataTAC is a wireless data communication network that provides
host computer system access from vehicle-mounted (mobile) or handheld
(portable) wireless computers. The network extends normal wireline
computer functions, such as logging into a computer and accessing
application services, to field users. The Private DataTAC network supports
field users who move throughout a predefined geographic area, or coverage
area, determined by radio channel coverage design.
The Private DataTAC network provides the communications path between
the field user and a host computer network. Application programs residing
in the host computer and in the wireless computer perform operator
functions. These application programs use Private DataTAC network
services to communicate with each other. Field users can take advantage of
Private DataTAC mobility services to conduct their duties wherever they go
within the coverage area.
The Private DataTAC network and applications can complement or replace
functions provided by a dispatcher communicating with field personnel
through mobile or portable voice radios. A dispatcher obtains information
from a wireline terminal. This information can be communicated to the field
user verbally over voice radio, but the information becomes available
directly to the field user with a wireless computer via a Private DataTAC
network. This ability increases the efficiency of a customer operation.
The Private DataTAC network enables other functions not traditionally
implemented using wireline computers. These functions include Automatic