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AssigneeHoneywell Information Systems Inc.
InventorsJean Akriche, Andre Molitor
Estimating the term…
A data processing system includes a data processing unit and a number of communication units for coupling a corresponding number of terminal devices for transmission and reception of signals over a number of communication lines. Apparatus checks the operation of the communication units and includes logic circuits which couple to the receiver and transmitter circuits of each unit, circuits for transmitting checking signals to the receiver circuits of the unit and circuits for receiving signals transmitted by the transmitter circuits of the units. Additionally, each of the logic circuits couples to the data processing unit and are arranged to be enabled in succession by the data processing unit for transmission and reception of the checking signals and response signals respectively while still allowing the units not being checked to operate normally.
An arrangement for maintaining communication apparatus coupled between a main station and a plurality of communication terminals by a plurality of communication lines, said communication apparatus including a plurality of communication means, each including a plurality of reception and transmission circuits and being operative to control transmission over a communication line coupled between said main station and one of said terminals, said arrangement comprising:
A maintenance arrangement for maintaining communication apparatus coupled between a data processing unit and a plurality of terminals, a plurality of communications means, each including receiver circuits and transmitter circuits, each coupled to a line and operative to control signal communication over said line between said processing unit and a different one of said terminals, said maintenance arrangement comprising:
Dependencies are inferred from the claim text.