Transmission apparatus and method for controlling the transmission apparatus

A transmission apparatus, comprising:

• a first output processor configured to output first data of a control signal for performing monitoring, maintenance and/or operation of the transmission apparatus and a communication network,
• a second output processor, coupled to the first outputprocessor and configured to receive the first data of the control signal and to output second data of the control signal,
• a data signal process circuit, coupled to the communication network and to the second output processor, configured to receive data to be transmitted from the communication network and to transmit the received data to be transmitted, to which the second data of the control signal is added, to another transmission apparatus through the communication network;
• and
• a third processor, coupled to the first output processor and the second output processor, configured to execute a procedure, the procedure comprising:
• updating a function of the first output processor;
• causing the second output processor, during performance of the updating, to hold the first data of the control signal that is output from the first output processor before the updating, and to output the held first data of the control signal to the data signal process circuit as the second data of the control signal;
• and
• causing the second output processor, when the updating is completed, to output the first data of the control signal, received from the first output processor with the updated function, as the second data of the control signal to the data signal process circuit.