Browse Prior Art Database

Word Processing Display Unit with Means for Indicating Communications Status

IP.com Disclosure Number: IPCOM000048280D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Benignus, DM: AUTHOR [+4]

Abstract

The present apparatus relates to communications via serial data links between word processing display work stations using binary synchronous communication. During such communication, there are many circumstances during sending and receiving when one of the terminals is in "wait" status. During normal momentary delays in a properly functioning communication system, this "wait" status is common. However, it will also occur when there is an error condition which will impede the normal operation of the communications linkage. The present system provides a protocol expedient which will distinguish normal "wait" conditions from the "wait" conditions caused by errors.

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Word Processing Display Unit with Means for Indicating Communications Status

The present apparatus relates to communications via serial data links between word processing display work stations using binary synchronous communication. During such communication, there are many circumstances during sending and receiving when one of the terminals is in "wait" status. During normal momentary delays in a properly functioning communication system, this "wait" status is common. However, it will also occur when there is an error condition which will impede the normal operation of the communications linkage. The present system provides a protocol expedient which will distinguish normal "wait" conditions from the "wait" conditions caused by errors.

As will be hereinafter described in greater detail, in one embodiment of the present system, if 10 WACKs (waiting acknowledgements) are received by the sending station, then, communication linkage is considered to be an error rather than a normal "wait" condition.

When using bisynchronous communications protocol, the operator at either terminal, a problem on the link (modems or line), a local machine failure, or a problem with the remote terminal may cause productive communications to be suspended. Once suspended, communication may or may not be resumed. To alert the word processing terminal's operator to these conditions and provide an indication to where the problem lies (local work station, link, remote partner, or operator), the terminal will display and blink additional Link Status subfield messages on its display.

A threshold approach is used to potentially identify problem areas. Only after that threshold is reached is the operator notified. If the problem is corrected, the indicator is replaced by normal operating status.

These indicators are meant to address the area where there is not a local hardware problem but there is a communication problem. The indicators along with their definition and problem determination benefit are:
WAITING - indicates that the remote work station or operator is delaying communication. The "WAITING" status is displayed when the conditions, as shown in the following chart, occur. TRANSMISSION INDICATOR LINK STATUS equals WAITING

SEND 10 consecutive WACKs were received

RECEIVE 10 consecutive TTDs (Temporary Text

Delays) were received

The status indication is reset when an ACK (acknowledgement) or a data block is received or transmission is ended. The "WAITING" status indicates that the problem is not in the local work station or on the link. Instead, it indicates that the remote work station is having problems or the remote operator is delaying the job.

BUSY - indicates...