| 摘要 |
PURPOSE:To attain ease of fault location and ease of error correction as required by adding an error check data at each time slot and detecting the presence of an error at each time slot. CONSTITUTION:Plural terminal stations 2-0,... are connected to a transmission line 1 and plural terminal devices are connected to each terminal station. The terminal stations 2-0... are provided with information separating sections 3-0..., information multiplex parts 4-0,... and error detection parts 5-0... to apply error detection to the content of each time slot, and with parity producing parts 6-0... to add the error check data at each time slot. When frame information is received in bit serial, a counter 8 counts the clock, sections it in the unit of 8-bit to distribute information to a serial parallel converting part 9-#i. Each parity check circuit 10-#i in this case detects the presence of an error as to the information of 8-bit and when the error exists, an alarm generating part 11 is started.
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