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Circuit Switching: Guest Editor's Introduction

IP.com Disclosure Number: IPCOM000131402D
Original Publication Date: 1979-Jun-01
Included in the Prior Art Database: 2005-Nov-10
Document File: 2 page(s) / 15K

Publishing Venue

Software Patent Institute

Related People

Kenneth J. Thurber: AUTHOR [+3]

Abstract

Currently there is a considerable interest in the development of digital communication techniques. This interest is due to the development of distributed processing concepts,'23 to changing regulatory policies of the US Government (the Carterfone decision and subsequent FCC rulings), and to the development of large networks.4 One widely used communication technique that has tremendous growth potential is circuit switching. There are two primary reasons for computer-oriented people to be interested in circuit switching. First, the computer plays a major role in the control and implementation of a circuit switch.5 Second, circuit switches have been used as the interconnection structure for systems containing (or hypothesized to contain\ a multiplicity of processing elements.2 5 6

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

This record contains textual material that is copyright ©; 1979 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Contact the IEEE Computer Society http://www.computer.org/ (714-821-8380) for copies of the complete work that was the source of this textual material and for all use beyond that as a record from the SPI Database.

Circuit Switching: Guest Editor's Introduction

Kenneth J. Thurber

Sperry Univac

Currently there is a considerable interest in the development of digital communication techniques. This interest is due to the development of distributed processing concepts,'23 to changing regulatory policies of the US Government (the Carterfone decision and subsequent FCC rulings), and to the development of large networks.4 One widely used communication technique that has tremendous growth potential is circuit switching. There are two primary reasons for computer-oriented people to be interested in circuit switching. First, the computer plays a major role in the control and implementation of a circuit switch.5 Second, circuit switches have been used as the interconnection structure for systems containing (or hypothesized to contain\ a multiplicity of processing elements.2 5 6

A circuit switch consists of a set of circuits (lines) which are used to interconnect a set of ports. The connection topology and thus the interconnection pattern may be changed by a rerouting procedure. A simple circuit switch may be modeled as a set of n input ports and n output ports, between which is interposed a set of circuits with variable routes -- in particular, a set of circuits which can be altered in such a manner as to allow arbitrary port interconnection under varying statistical assumptions about the ability to complete the connection. A more complete model involves concepts of concentration (more inputs than outputs), connection (equal numbers of inputs and outputs\, and expansion (more outputs than inputs). Example systems include the Bell System, the Rolm CBX, processor crossbar switches, and interconnection switches.

This issue of Computer provides an overview of circuit switching. The first article, by Amos Joel, gives a global perspective of the subject. Jim Kasson describes a specific example of an advanced communication product based on time- division multiplexing, the Rolm CBX. Gerald Masson...