Browse Prior Art Database

Full Duplex Adapter for Terminal System

IP.com Disclosure Number: IPCOM000077436D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Dingwall, RP: AUTHOR

Abstract

This adapter provides full-duplex operation (simultaneous transit and receive) between a remote IBM 1050 terminal system and a local computer or terminal system.

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Full Duplex Adapter for Terminal System

This adapter provides full-duplex operation (simultaneous transit and receive) between a remote IBM 1050 terminal system and a local computer or terminal system.

The problem of maintaining control and assuring integrity of the telephone facilities is overcome, by maintaining continuous communications between the local and remote portions of the adapter.

The adaptor system consists of two physical parts, namely an adaptor 10 attached to a local computer 11, and a remote adapter 12 attached to a printer 14 and associated input and output devices 15 through 18.

When no data is being transmitted, the local adapter 10 transmits delete characters at a frequency of 100 ms. The remote adapter 12 responds by returning a portion of these characters, to indicate the ready status of the remote receive components. When the local adapter 10 is transmitting data at a frequency of 70 ms, the remote adapter 12 responds by transmitting status characters at a frequency of 140 ms confirming receipt of the data. At any time, the remote adapter 12 can transmit data rather than status characters. If neither data nor status characters are received by the local adapter 10, an indicator is set specifying that the communications loop is not operational, and the local adapter 10 begins transmitting delete characters at a frequency of 200 ms to alert the remote station 12 of this condition.

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