DUPLEXING SYSTEM FOR ACCESS LINE

PROBLEM TO BE SOLVED: To provide an access system network for which it is not necessary to duplex subscriber's line terminal station equipment. SOLUTION: User terminals 1-6 are provided with both interfaces of wired and wireless systems and concerning an exchange, an access system network based on ATM data transfer techniques is constructed from an exchange 20 provided with the interface of the wireless system and an exchange 30 provided with the interface of wired system. Then, the line of wired system is made into a route through subscriber's line terminal station equipment 40 and the line of wireless system is made into a route through a wireless interchange station 71 loaded on a moored float 8. If a fault occurs on one line when the wired and wireless systems are simultaneously used all the time, the transmission destination identification information of ATM cells of transmission data is reloaded by an exchange 10 so that the other line can be used as a detour route, and the spot of the fault is bypassed.