| 摘要 |
PURPOSE:To attain efficient communication at high speed by using a multiplex line control function as a means controlling communication line and deciding which of a ground line and a satellite communication line is to be used depending on the line state so as to use the line in common and switching the line. CONSTITUTION:Network control programs 101, 101' are stored respectively in communication controllers 6, 6'. Virtual communication access control programs 102, 102' and user programs 103, 103' are stored in host computers 7, 7'. Multiplex line control is applied between the host computers 7, 7'. The communication controller 6 selects a line optimum to a communication data and uses it switchingly based on internal information such as a data from the hostcomputer 7 and the capability of the communication line while the information of the line state is being detected. If any line has a fault, a faulty line is switched into a normal line as the switching function. |
