Patent ID: 7991286

Claim:
An optical transmission apparatus for transmitting an optical SDH/SONET signal in a ring network, comprising: a first line card and a second line card, each including a plurality of ports connected to a redundant line having a working line and a protection line, a hardware unit, a CPU, and a master-slave CPU distribution setting unit, wherein the hardware unit obtains failure information on the redundant line for each of the ports, the CPU determines switching control of the redundant line for each of the ports based on the failure information obtained by the hardware unit, and thereby the hardware unit switches the redundant line based on the switching control determined by the CPU, and the master-slave CPU distribution setting unit sets the CPU of one of the first line card and the second line card as a master CPU that determines the switching control of the redundant line, and sets the CPU of the other of the first line card and the second line as a slave CPU, for each set of the ports.