Analogue Cellular Systems


Chapter 3

[1]  Introduction
[2]  Advanced Mobile Phone System (AMPS)

2.1. Introduction
2.2. History of AMPS
2.3. Standards

[3]  Narrowband Advanced Phone System (NAMPS)
[4]  Technologies used to send data over cellular

4.1. Introduction
4.2. Cellular Circuit-Switched Data (CCSD)

4.2.1 What is Cellular Circuit-Switched Data? (CCSD)
4.2.2 How does Cellular Circuit-Switched Data work?

4.3 Cellular Digital Packed Data (CDPD)

4.3.1 What is Cellular Digital Packet Data?
4.3.2 How does Cellular Digital Packet Work?
4.3.3 Cellular Digital Packet Data Usage
4.3.4 CDPD architecture and capabilities
4.3.5 CDPD connections to other networks
4.3.6 CDPD protocol support

4.4 Comparing Circuit-Switched and CDPD

[5]  The Benefits of Data Over Cellular
[6]  Cellular Networking Fundamentals

6.1 Analog-to-Digital
6.2 Circuit-Switched Vs. Packet-Switched

[7]  Other Wireless Data Networks

7.1 Introduction
7.2 Data over Analog Cellular
7.3 ARDIS
7.4 RAM Mobile Data
7.5 ESMR
7.6 Metricom
7.7 Summary Information

Introduction

This chapter deals with Analogue Cellular systems, which have been surpassed by Digital systems in recent years. The reasons being, digital systems offer better quality, greater flexibility and the possibility of a wider range of services which are discussed in greater detail in the next chapter (Chapter 4).

In table 1 below some analogue cellular systems are shown along with there most important characteristics, from this list we are going to discuss :

"Advanced Mobile Phone System - AMPS" which is a first generation cellular network developed by Bell Labs, and
"Narrowband Analogue Cellular System - NAMPS" which tries to solve the problem of low calling capacity that the AMPS systems suffered from.

	AMPS	NAMPS	ETACS	NTACS	NMT-450	NMT-900
Transmit Band (MHz)	824 - 849	824 - 849	871 - 904	915 - 925	453 - 458	890 - 915
Receive Band (MHz)	869 - 894	869 - 894	916 - 949	860 - 870	463 - 468	935 - 960
Multiple Access Method	FDMA	FDMA	FDMA	FDMA	FDMA	FDMA
Duplex Method	FDD	FDD	FDD	FDD	FDD	FDD
Channel Spacing (KHz)	30	10	25	12.5	25	12.5
Number of Channels	832	2496	1240	400	200	1999
Modulation	FM	FM	FM	FM	FM	FM

Table 1: Analogue Cellular Technologies