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

Claim 3:
4. A method of updating an optical transmission device that includes a 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 signal processor shifts from a first state in which the client signal is accommodated into the n time slot sequences to a second state in which the client signal is accommodated into the other time slot sequences,
a first transceiver circuit that is connected to the first frame generator circuit is stopped, while the frame generated by the second frame generator circuit is transmitted using a second transceiver circuit, the first transceiver circuit including a plurality of transceivers,
while the first transceiver circuit is stopped, the client signal is accommodated into the other time slot sequences such that an amount of the client signal accommodated into the other time slot sequences does not exceed a bandwidth of the second frame generator and transmitted by the second transceiver circuit,
the signal processor shifts to the first state from the second state after the first transceiver circuit is replaced with a third transceiver circuit, and
the frame generated by the first frame generator circuit is transmitted using the third transceiver circuit, while the frame generated by the second frame generator circuit is transmitted using the second transceiver circuit, a bandwidth of the third transceiver circuit being equal to a sum of bandwidths of the plurality of the transceivers included in the first transceiver circuit.