Data transmission apparatus to be connected to multiplexed transmission line
First Claim
1. A data transmission system, comprising:
- multiplexed data transmission means, including a plurality of transmission channels, for transmitting the same data through the plurality of transmission channels at a normal time;
first data check means, connected to said data transmission means, for making an error check with respect to data transmitted through the transmission channels;
selection means, connected to said data transmission means, for selecting one of the transmission channels to receive data transmitted through the selected transmission channel and for outputting the received data;
second data check means, connected to said selection means to receive data output therefrom, for making an error check with respect to the data output from said selection means; and
determination means, connected to said first and second data check means, for determining that an error is caused as a result of switching of transmission line selection performed by said selection means during data reception, if the error is detected by said second data check means without being detected by said first data check means.
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Accused Products
Abstract
A transmission apparatus comprises a first data check circuit for making an error check with respect to the data transmitted through each transmission channel of a multiplexed transmission line, a selection circuit for selecting one transmission channel of the multiplexed line and outputting the data transmitted through the selected transmitting channel, a second data check circuit for making an error check with respect to the data output from the selection circuit, and a data processing section for determining the cause of an error on the basis of results of the error checks made by the first and second data check circuits. If an error is detected by the second data check circuit without being detected by the first data check circuit, the data processing section determines that the error has been caused as a result of the switching operation performed by the selection circuit.
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Citations
19 Claims
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1. A data transmission system, comprising:
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multiplexed data transmission means, including a plurality of transmission channels, for transmitting the same data through the plurality of transmission channels at a normal time; first data check means, connected to said data transmission means, for making an error check with respect to data transmitted through the transmission channels; selection means, connected to said data transmission means, for selecting one of the transmission channels to receive data transmitted through the selected transmission channel and for outputting the received data; second data check means, connected to said selection means to receive data output therefrom, for making an error check with respect to the data output from said selection means; and determination means, connected to said first and second data check means, for determining that an error is caused as a result of switching of transmission line selection performed by said selection means during data reception, if the error is detected by said second data check means without being detected by said first data check means. - View Dependent Claims (2, 3, 4)
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5. A data transmission system, comprising:
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a multiplexed data transmission line including a plurality of transmission channels; a process console connected to said data transmission line; and a process controller connected to said data transmission line; at least one of said process console and said process controller including; first data check means for making an error check with respect to data transmitted through each of the transmission channels; selection means, connected to the data transmission channels, for selecting one of the transmission channels and outputting data transmitted through the selected transmission channel; second data check means for making an error check with respect to the data output from said selection means; and data processing means connected to said first data check means, said second data check means, said transmission channels, and said selection means, said data processing means being for determining a cause of an error on the basis of results of the error checks made by said first and second data check means when received data includes an error, for performing data processings on the basis of the data output from said selection means, and for outputting the processed data to the transmission channels. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A data transmission apparatus, comprising:
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first data check means for making an error check with respect to data transmitted through each of channels of a multiplexed data transmission line; selection means, connected to each channel of said data transmission line, for selecting one of the channels and for outputting data transmitted through the selected channel; second data check means for making an error check with respect to the data output from said selection means; data processing means, which receives the data output from said selection means, for performing a predetermined data processing operation; and wherein said data processing means determines a cause of an error on the basis of results of the error checks made by said first and second data check means. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification