| 摘要 |
PURPOSE: To reduce the cost of an exchange and further to enforce a fault restoration without providing a device concentratedly restoring a fault by omitting a redundant hardware constitution for securing the high reliability of an exchange. CONSTITUTION: An incoming exchange 6 is provided with a fault restoration message generation part 12 as a means transmitting a fault restoration message to a virtual pass. A fault restoration message cell has a destination area and a message area. On the destination area, information for reaching a transmitting exchange 1 is mounted via one or more repeating exchanges 2 to 5 and 7 to 9. The repeating exchanges 2 to 5 and 7 to 9 are provided with a fault restoration message cell information mounting parts 14 mounting null band information on the repeating exchanges 2 to 5 and 7 to 9 in the message area of the routing fault restoration message cell. By this constitution, constitution, the cost of the exchange is reduced and further, the restoration is made possible without providing a device concentrately performing a fault restoration.
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