Patent ID: 8615172

Claim:
A method for arranging relay stations in an optical transmission system including a plurality of relay stations arranged so that an optical signal at a first transmission speed can be transmitted from a transmission end to a reception end; the method comprising: judging whether a transmission of an optical signal at a second transmission speed which is different from the first transmission speed in a section connecting arbitrary two of the plurality of relay stations in which a regenerative repeater station capable of regenerating an optical signal can be arranged is possible; determining a combination of sections judged to be capable of performing transmission that enables a transmission of an optical signal from the transmission end to the reception end; and making both ends of respective sections of the determined combination be the relay stations where the regenerative repeater station is arranged, wherein in the judging, a judgment condition which is satisfied in a section including a plurality of sections but unsatisfied in one of the plurality of sections is included.