| 摘要 |
In an ATM communication system, in order to prevent a user from an unnecessary charge due to omitting AIS (Alarm Indication Signal) transmitted/received between a transmission side ATM unit and a receiving side ATM unit when a loss of service occurs in a communication network in which existing communication lines are connected by an ATM communication unit, the transmission side ATM unit is configured to monitor a signal received from a communication line on the transmission side and to stop transmission of ATM cells to the receiving side ATM unit for a certain period of time when it detects an AIS signal indicating a loss of service on the transmission side. The receiving side ATM unit is configured to monitor the reception of the ATM cells transmitted from the transmission side ATM unit and when it recognizes that the receiving of the ATM cells is stopped for a certain period of time, it generates an AIS signal indicating the loss of service on the transmission side and sends it on the communication line on the receiving side.
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