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Browse Prior Art Database

Communications Interface Measurement and Event Tracer

IP.com Disclosure Number: IPCOM000079591D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Hunter, M: AUTHOR [+2]

Abstract

This monitoring unit is designed to provide a record of fault conditions in a data transmission system. The record provides an aid to determine whether faults are located in lines or hardware or software.

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Communications Interface Measurement and Event Tracer

This monitoring unit is designed to provide a record of fault conditions in a data transmission system. The record provides an aid to determine whether faults are located in lines or hardware or software.

Input terminals 1 to 4 are arranged to receive, respectively, REQUEST TO SEND signals from a TCU, READY FOR SENDING and DATA CARRIER DETECT signals from a MODEM, and LINE BREAK signals from a SECMAT. Each terminal is connected, through an isolating amplifier (5 to 8) to a monostable circuit (9 to 12) which stretches input pulses to drive a relay unit (13 to 16). Upon receipt of a pulse indicating a fault condition, the appropriate relay drives a counter (17 to 20) and a latch circuit (21 to 24). The latch circuits, which, after receiving a pulse from a relay unit, remain set until they are manually reset, each drive an indicator lamp (25 to 28). The outputs from the relay units also drive different channels of a pen recorder 29 which receives as a further channel input, time marker signals from a timing unit 30. A switch 31 is settable to direct the output from any one of the relay units to an audible alarm system 32. This alarm system may either be self-contained within the monitoring unit or it may comprise a pocket-paging system, with the transmitter located within the unit to provide a remote alarm indication.

Thus, in addition to providing an alarm indication, the unit shows, by lights 25 to 28, an indic...