Patent ID: 8897650

Claim:
A sending/receiving system comprising: a first sending/receiving apparatus that includes: a first sending section that serially sends link establishment information via a plurality of first transmission channels, the link establishment information being used to establish a link; and a second sending/receiving apparatus that includes: a second sending section that serially sends link establishment information to the first sending/receiving apparatus via a second transmission channel, the link establishment information being used to establish a link, a plurality of link establishing sections, each of the plurality of link establishing sections being a section that is provided for a corresponding one of the plurality of first transmission channels and that establishes a link in the corresponding first transmission channel based on the link establishment information which has been sent from the first sending section of the first sending/receiving apparatus, and a controller that, when links have been established in all of the plurality of first transmission channels by the plurality of link establishing sections, causes the second sending section to send the link establishment information in order to cause the first sending/receiving apparatus to establish a link in the second transmission channel, wherein the plurality of first transmission channels and the second transmission channel are optical transmission channels through which optical signals are transmitted, wherein the first sending section of the first sending/receiving apparatus includes: a plurality of optical-signal sending units that, before the link establishment information is sent, serially send verification information via the plurality of first transmission channels using optical signals having optical power per unit time which is smaller than optical power per unit time in a case of sending the link establishment information, the verification information being used for verification and being different from the link establishment information, and an optical-signal receiving unit that receives an optical signal which has been serially sent from the second sending/receiving apparatus via the second transmission channel, and wherein the second sending section of the second sending/receiving apparatus includes: an optical-signal sending section that, before the link establishment information is sent, serially sends verification information via the second transmission channel using an optical signal having optical power per unit time which is smaller than optical power per unit time in a case of sending the link establishment information, the verification information being used for verification and being different from the link establishment information, and a plurality of optical-signal receiving sections that receive optical signals which have been serially sent from the first sending/receiving apparatus via the plurality of first transmission channels.