Patent ID: 7443843

Claim:
A terminal relay device in a network, comprising: a cross-connect processing circuit executing a cross-connect process including line setting on a network, having a plurality of input-side interfaces and a plurality of output-side interfaces; a first transmission path switchover unit switching over a working traffic transmission path providing a line on the network and a protection traffic transmission path serving as a substitute transmission path for said working traffic transmission path on an input side of said cross-connect processing circuit; a second transmission path switchover unit switching over a working traffic transmission path providing a line on the network and a protection traffic transmission path serving as a substitute transmission path for said working traffic transmission path on an output side of said cross-connect processing circuit, said first transmission path switchover unit and said second transmission path switchover unit each having an input-side interface and an output-side interface; a plurality of slot units, into which interface units connectable to the transmission path on the network or interface units connectable to a low-order network to be connected to the network are inserted, said each of slot unit receiving a transmitting terminal or a receiving terminal on said interface unit connectable to the network or the low-order network; a first selection unit selectively connecting the receiving terminal on said interface unit inserted into any one of said slot units to said input-side interface of said first transmission path switchover unit; a second selection unit connecting said output-side interface of said first transmission path switchover unit to said input-side interface of said cross-connect processing circuit; a third selection unit selectively connecting said output-side interface of said cross-connect processing circuit to said input-side interface of said second transmission path switchover unit; and a fourth selection unit connecting said output-side interface of said second transmission path switchover unit to said transmitting terminal on said interface unit inserted into any one of said slot units.