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Browse Prior Art Database

Telegraph Equipment Tester

IP.com Disclosure Number: IPCOM000095504D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Lantz, RH: AUTHOR [+2]

Abstract

A data processing system tests telegraph equipment distortion by interpreting changes that the equipment produces upon known signals.

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Telegraph Equipment Tester

A data processing system tests telegraph equipment distortion by interpreting changes that the equipment produces upon known signals.

During testing, a telegraph transmitter produces telegraph characters faster than a connected receiver, the receiver sampling two seven-signal characters (1 and 2) for every three seven-signal characters (A, B and C) transmitted. Since the transmitted three characters have known decimal values, identification of the two received characters decimal values classifies the distortion type.

The three output characters A, B and C (decimal values 2, 12 and 27 respectively) are normally received as two input characters having decimal values of 10 and 21. If there is late (relay closing) distortion, shown at point L1 for example, corresponding output changes, for example point L2, occur. A regular pattern of late distortion causes recognition of two input characters having values 8 and 31 instead of the normal decimal values. Points E1 and E2 illustrate one of the effects of early (relay opening) distortion which will, instead of the normal values, cause recognition of two input characters valued 2 and 17.

Thus, the input character decoder determines whether transmission is normal, or subject to early or late distortion.

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