| 摘要 |
PURPOSE:To allow a sender communication equipment to collate a fed-back time slot and a test data and discriminate the state by adding a test mode display to an allocation time slot of each data communication equipment and sending a test data. CONSTITUTION:When the execution of a test program 70 is started by the designation from a test panel of a data communication equipment, a test data 71 is transferred to a transmission buffer 47 and a bus 72 from a register 65 and the test data for the transmission buffer 49 is sent under normal control by using the allocated time slot. A control section 7 of the transmission time slot, however, is set to a bit pattern decided as the display of the test mode on the data register 45. The opposite data communication equipment receives the time slot to process the control section 7, and when the test mode is detected, the normal reception is stopped to relay the received time slot as it is. The reception side data communication equipment receives the time slot assigned to the own station for the test mode fed back through a ring transmission line and the data part 8 and the test data 71 are compared.
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