Patent ID: 9705629
Date: 2017-07-11
CPC Classifications: H04J

Claim:
1. A transmitting device coupled to a first route and a second route as communication paths on a first ring network where communication is performed bidirectionally, and coupled to a third route as a communication path on a second ring network where communication is performed bidirectionally, the transmitting device comprising: a first branching unit configured to branch and output signal light input from the first route to a first terminating unit that terminates signal light and a second output unit that outputs signal light to the second route; a second branching unit configured to branch and output signal light input from the second route to a second terminating unit that terminates signal light, a first output unit that outputs signal light to the first route, and a third output unit that outputs signal light to the third route; and a third branching unit configured to branch and output signal light input from the third route to a third terminating unit that terminates signal light and the second output unit, wherein the transmitting device is further coupled to a fourth route as a communication path on the second ring network and the transmitting device further includes a fourth branching unit configured to branch and output signal light input from the fourth route to a fourth terminating unit that terminates signal light and the third output unit, the third branching unit branches and outputs the signal light input from the third route to the third terminating unit, the second output unit, and a fourth output unit that outputs signal light to the fourth route; a first multiplexing unit configured to multiplex signal light to be newly output to the second route with the signal light output to the second output unit by the third branching unit; a fifth branching unit configured to branch and output the signal light multiplexed by the first multiplexing unit to the second output unit and the third terminating unit; a second multiplexing unit configured to multiplex signal light to be newly output to the third route with the signal light output to the third output unit by the second branching unit; and a sixth branching unit configured to branch and output the signal light multiplexed by the second multiplexing unit to the third output unit and the second terminating unit.