Browse Prior Art Database

Communication Between Remote Terminals Immediate Disconnect Function

IP.com Disclosure Number: IPCOM000048284D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 3 page(s) / 59K

Publishing Venue

IBM

Related People

Jeffries, AP: AUTHOR [+4]

Abstract

Because of the ever increasing use of communications, word processing and data processing, communication links have had an ever increasing demand. It is foreseen that there will be a greater need for expedients terminals whenever an error or other non-communication status arises so that precious communication linkages will not be tied up unnecessarily. In fact, it is currently a requirement in Germany to provide an immediate disconnect function for use, when necessary, between communicating terminals.

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Communication Between Remote Terminals Immediate Disconnect Function

Because of the ever increasing use of communications, word processing and data processing, communication links have had an ever increasing demand. It is foreseen that there will be a greater need for expedients terminals whenever an error or other non-communication status arises so that precious communication linkages will not be tied up unnecessarily. In fact, it is currently a requirement in Germany to provide an immediate disconnect function for use, when necessary, between communicating terminals.

The present system provides such an immediate disconnect function between communicating terminals so that communication linkages will not be tied up unnecessarily. A data path is provided for the disconnect function which in effect "short circuits" the normal data path taken by standard keystrokes. Thus, after the operator depresses the disconnect key, an access method is initiated which directly notifies a background communication process that a disconnect was detected. The scheme will] function regardless of the concurrent function which is being executed as a foreground task by the equipment.

With reference to the figure, there is shown a typical data/control flow for a high function, communicating text processing machine. In a system such as this, each process has a relative priority with respect to all other processes: Thus, a process can gain control only when no other higher priority process is active. Essentially access methods have the highest priority, followed by foreground processes and lastly the background processes. A typical keystroke is passed from the keyboard access method to the keyboard distributor through appropriate keystroke processors and passed to the background process, as required. Normally, the speed of the hardware is fast enough to pass t...