Page 172 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks Manmohan Sharma, Lovely Professional University

Notes Unit 11: Wireless WAN

CONTENTS

Objectives
Introduction
11.1 Wireless WAN User Devices
11.1.1 Packet Radio WANs
11.1.2 Cellular Digital Packet Data (CFPD)
11.1.3 Personal Communications Services (PCS)

11.1.4 Antennae
11.2 Wireless WAN Systems
11.2.1 Cellular WANs
11.2.2 Space-based Wireless WANs

11.3 Short Message Service (SMS) Applications
11.3.1 Person-to-Person Text Messaging
11.3.2 Provision of Information
11.3.3 Downloading
11.3.4 Alerts and Notifications

11.3.5 Two-way Interactive Text Messaging Applications
11.4 Summary
11.5 Keywords
11.6 Review Questions

11.7 Further Readings
Objectives

After studying this unit, you will be able to:
z z Discuss the concept of Wireless WAN User Devices
z z Explain the Wireless WAN Systems
z z Describe the Short Message Service (SMS) Applications

Introduction

As the term implies, a WAN spans a large physical distance. The Internet is the largest WAN,
spanning the Earth. A WAN is a geographically-dispersed collection of LANs. A network device
called a routerconnects LANs to a WAN. In IP networking, the router maintains both a LAN
address and a WAN address. A WAN differs from a LAN in several important ways. Most
WANs (like the Internet) are not owned by any one organization but rather exist under collective
or distributed ownership and management. WANs tend to use technology like ATM, Frame
Relay and X.25 for connectivity over the longer distances.

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