Patent ID: 11923968
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical transmission device used in a communication system that transmits a frame, the optical transmission device comprising:
a first frame reproducing circuit configured to reproduce a frame from a first optical signal that is transmitted from a correspondent device;
a second frame reproducing circuit configured to reproduce a frame from a second optical signal that is transmitted from the correspondent device; and
a signal processor configured to extract a client signal from a frame reproduced by at least one of the first frame reproducing circuit and the second frame reproducing circuit,
wherein the correspondent device comprises:
a second signal processor configured to accommodate a client signal into one or a plurality of time slot sequences among n time slot sequences;
a first frame generator circuit configured to generate a frame including the client signal accommodated into a part of time slot sequences among the n time slot sequences; and
a second frame generator circuit configured to generate a frame including the client signal accommodated into other time slot sequences among the n time slot sequences,

wherein
the second signal processor accommodates the client signal into the n time slot sequences when the first frame generator circuit and the second frame generator circuit are implemented,
the second signal processor accommodates the client signal into the other time slot sequences when the first frame generator circuit is not implemented and the second frame generator circuit is implemented, and
a bandwidth of the frame generated by the second frame generator circuit when the first frame generator circuit is not implemented and the second frame generator circuit is implemented is respectively equal to a bandwidth of the frame generated by the first frame generator circuit and a bandwidth of the frame generated by the second frame generator circuit when the first frame generator circuit and the second frame generator circuit are implemented, and
wherein when the optical transmission device receives information indicating that the first frame generator circuit is under update from the correspondent device, the first frame reproducing circuit stops operation, and the signal processor extracts the client signal from the frame reproduced by the second frame reproducing circuit.