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Browse Prior Art Database

Dynamic Communication Line Scanning

IP.com Disclosure Number: IPCOM000069679D
Original Publication Date: 1978-Jun-01
Included in the Prior Art Database: 2005-Feb-21

Publishing Venue

IBM

Related People

Authors:
Massman, LH [+details]

Abstract

In some multiline communication adapters, each line is scanned sequentially. This allows each line to use the controller's processing time equally. It also indicates that all lines have the capability of running at the same speed simultaneously. In some cases, it is desirable to have the ability to service higher speed lines. These higher speed lines cannot be maintained using a sequential scan due to the performance limits of the controller. For example, if the controller takes 200 microseconds (mu s) to service one line and eight lines are running the minimum time between scanning any single line is 1.6 milliseconds (ms), which limits the line speed to 4800 baud. Speeds of 7200 and 9600 baud cannot be achieved.