Browse Prior Art Database

Line Scanning System

IP.com Disclosure Number: IPCOM000093690D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Beausoleil, WF: AUTHOR [+2]

Abstract

In many communication systems in which digital information is being transmitted through a plurality of lines, line scanning is effected at a constant rate. Such rate depends upon the duration of the shortest digital information to be detected.

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Line Scanning System

In many communication systems in which digital information is being transmitted through a plurality of lines, line scanning is effected at a constant rate. Such rate depends upon the duration of the shortest digital information to be detected.

In this system, scanning at the previous rate occurs only on the busy lines. All other lines are scanned at a lower rate. The total number of tests to be performed is thus notably reduced. The system comprises a Storage Device providing two tables respectively containing at all time busy line addresses and idle line addresses.

Owing to a Clock and Address Counter system, busy and idle line addresses are read out at, respectively, at the high and low rates, then are sent to a Line Address Register. The latter controls the Line Scanner which delivers the line status of the addressed line. This status is compared with the former status of the same line. When a status change is detected the corresponding line address is introduced into a Status Change Buffer, then sent to the processor. The latter carries out the processing of this information and updates the Busy and Idle Line Address Tables.

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