Technology - Infrastructure - Networks 1 - Network and Calls

Synopsis

This report discusses the history and current ubiquitous deployment of circuit-switched telephone networks and the analogue POTS and digital ISDN telephone services they operate with. Telephone exchanges, PC- and router-based alternatives to exchanges, ISDN voice and data calls, echo cancellation and voice compression are also discussed.

1. Synopsis
2. Introduction and historical perspective
- 2.1 Alternatives to ‘big-iron’ exchanges
3. A circuit-switched network
- 3.1 The inter-exchange network
- 3.2 Contrasting the telephone network and the Internet
4. Voice calls
- 4.1 Analogue POTS telephone calls
  - 4.1.1 Twisted pair copper telephone wires
  - 4.1.2 Echoes and echo cancellation
- 4.2 Compression of voice signals
  - 4.2.1 Analysis and re-synthesis
- 4.3 ISDN voice and data calls
  - 4.3.1 Charging for ISDN calls
5. Telephone exchanges
6. Related reports

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Number of pages: 9

Status: Archived

Last update: 01 August 2006
View update history

Author: Robin Whittle

NOTE: This report has been archived

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