PURPOSE: To store a point-to-point terminal in a loop network by dividing a frame into a channel for a terminal and a point-to-point terminal and distributing the signal of each channel to each terminal.
CONSTITUTION: A multiplexing device 2 and a frame synchronizing device 10 are connected to a main transmission line 1 with a loop shape and a terminal P5 having a loop control function and point-to-point P-P terminals T6 are connected to each device 2 respectively through a loop shaped subtransmission line 3 and a P-P terminal line 4 to constitute a loop net work. The device 10 transmits a frame constituted of a synchronizing pattern 7, a packet multiple channel 8 and a general terminal channel 9 and having fixed length with synchronization TF. Each device 2 distributes a signal from the channel 8 to the terminal P5 through the transmission line 3 and also distributes a signal from the channel to the terminal T6 through the line 4. The device 2 is also provided with a switch separating the transmission line 3 at the fault of the transmission line 3 and constituting a loop, so that the working rate of the system is improved.
KASHIO JIROU
YAGIYUU KAZUO
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