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Browse Prior Art Database

Modem Eliminator

IP.com Disclosure Number: IPCOM000083058D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

DeOrazio, WR: AUTHOR [+3]

Abstract

In a system where there are n terminals which may communicate with any one of n computers, there is generally a need for bisynchronous modems which are used to communicate between the terminals and the computers. In a system where the data flow does not travel over telephone lines, it is desirable to eliminate the modems.

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Modem Eliminator

In a system where there are n terminals which may communicate with any one of n computers, there is generally a need for bisynchronous modems which are used to communicate between the terminals and the computers. In a system where the data flow does not travel over telephone lines, it is desirable to eliminate the modems.

In the system shown, modems are eliminated and all n terminals and all n computers operate in synchronization with, that is their transmit clocks and receive clocks are operated from, a common source.

A variable oscillator 2 provides a synchronizing or clock signal to a driver 4, which applies the clock signal via a line 5 to terminals 6, 8, and 10 as well as to computers 12, 14, and 16. A crosspoint switch 18 communicates with terminals 6, 8 and 10 via lines 20, 22 and 24, respectively, and communicates with computers 12, 14 and 16 via lines 26, 28 and 30, respectively.

Variable-speed operation of the system illustrated is obtainable by varying the frequency output of the oscillator 2.

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