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Error Avoidance on Power Fluctuation

IP.com Disclosure Number: IPCOM000094834D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Andrews, DR: AUTHOR [+2]

Abstract

One significant source of error in a communication system can occur when power is turned on at a receiver in the middle of a message. I this instance, adjoining portions of two character codes closely following in time can be interpreted as a single, incorrect code. The receiver is structured not to begin effective receipt of signals when a signal is detected at power on. Power, however, can be regained so quickly in the event of a temporary power failure that such failure is not recognized by the structures provided. Therefore, upon power failure the machine is further interlocked against reception until carrier is recognized and then dropped.

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Error Avoidance on Power Fluctuation

One significant source of error in a communication system can occur when power is turned on at a receiver in the middle of a message. I this instance, adjoining portions of two character codes closely following in time can be interpreted as a single, incorrect code. The receiver is structured not to begin effective receipt of signals when a signal is detected at power on. Power, however, can be regained so quickly in the event of a temporary power failure that such failure is not recognized by the structures provided. Therefore, upon power failure the machine is further interlocked against reception until carrier is recognized and then dropped.

Errors generated by reception of incorrect codes are particularly significant in systems of printing terminals in a communications link which are addressed, and in which receivers, in some addressed status, automatically transmit certain replies. In such a system, a certain character is reserved for addressing, but it can occur in an incorrect code received because of power fluctuation.

The signal detector of the receiver is provided with a carrier detector which indicates when another machine is transmitting on the line. When the machine is turned on, reception from the line is inhibited until a lack of carrier is detected on the line. At this time, the receiver acts upon any subsequent information received.

If, however, power is lost to the signal detector, which can be a separate uni...