| 摘要 |
A communication control method inclusively having test function for testing or checking the operations of the communication control equipment at the physical layer in the ATM communication. This communication control method is applied to a communication control system in which data cell sent from an ATM layer control unit is inputted to the transmission system to convert it into frame data to transmit it to the transmission line, and frame data sent from the transmission line is inputted to the receiving system to convert it into data cell to transmit it to the ATM layer control unit, thus to allow data cell inputted to the transmission system to undergo loop-back to deliver it to the receiving system. In the transmission system, the method comprises respectively generating idle cell and test cell, whereby when data cell sent from the ATM layer control unit is delivered, this data cell is outputted, when output of test cell is designated from the external, e.g., host computer, etc. in the case where no data cell exists, the test cell is outputted, and when no data cell exists and output of the test cell is not designated from the external, the idle cell is outputted. Provision of an equipment for implementing such a communication control method permits the physical layer control unit to carry out test by itself without providing evaluation equipment dedicated for test at the external thereof. This contributes to realization of reduced cost and easy maintenance and check.
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