Importance

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Abstract

A synchronous communication system includes a plurality of node elements and at least one two-way transmission line. Each of the node elements contains a receiving unit for receiving information which is transmitted on the transmission line; a transmitting unit for transmitting information on the transmission line; a terminal interface, which is operable as an interface between a terminal device and the node element; an error detecting unit for detecting an occurrence of an error in information which is to be supplied to the terminal interface; a pattern generating unit for generating a predetermined pattern for indicating an occurrence of an error; and a selector is provided between the terminal interface and the receiving unit, for selecting the output of the pattern generating unit to supply the selected output to the terminal interface when the error detecting unit detects an error; or selecting the output of the receiving unit to supply the selected output to the terminal interface when the error detecting unit does not detect an error. Further, another selector, provided in a stage preceding the transmitting unit, for receiving the outputs of the pattern generating unit and the terminal interface, and selecting the output of the pattern generating unit to supply the selected output to the transmitting unit when the error detecting unit detects an error; or selecting the output of the terminal interface to supply the selected output to the transmitting unit when the error detecting unit does not detect an error.

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First Claim