Patent ID: 8767802

Claim:
A transmission device comprising: a receiver configured to receive a signal transmission frame from a network, the signal transmission frame having a client signal mapped thereto; a first separator configured to separate the client signal from the signal transmission frame; a phase synchronizer configured to generate a clock based on a frequency adjustment information set of the client information included in the signal transmission frame; a transmitter configured to transmit the client signal to a client transmission path using the clock generated by the phase synchronizer; a memory configured to store the frequency adjustment information set included in the signal transmission frame in a case in which the receiver receives the signal transmission frame from the network; and a switch controller configured to switch the phase synchronizer from a state in which the clock is generated based on the frequency adjustment information set of the client information included in the signal transmission frame received by the receiver, to a state in which the clock is generated based on the frequency adjustment information set stored in the memory, in a case in which the receiver receives no signal transmission frame from the network.