Patent ID: 7751345

Claim:
An optical network design method for determining an accommodation configuration of accommodating a plurality of client signals to ports of at least one optical transmission/reception card that outputs, as an optical signal, the plurality of client signals by applying a time division multiplexing to the signals of which an optical signal-side protection is the same, wherein a computer judges whether or not there exists a client signal of a bandwidth larger than a value that results from dividing an optical signal band of the at least one optical transmission/reception card by the number of utilizable ports for a client signal that is determined by the number of required optical transmission/reception cards for each node of an optical network in accordance with the optical signal-side protection type and by the number of client ports of each optical transmission/reception card; if the client signal of the larger bandwidth exists, the computer extracts at least one combination of client signals including one client signal or more having a maximum bandwidth, of client signals of which a total sum of signal bands of the client signals to be accommodated in each optical transmission/reception card is equal to or smaller than an optical signal band thereof, and of client signals of which the number of total ports required in correspondence with the respective client-side protection types of all client signals is equal to the number of utilizable ports for the client signals; and the computer selects a combination of client signals of which the total bandwidth of the client signals is a maximum from among the extracted combinations of client signals as the combination of client signals that are accommodated in the at least one optical transmission/reception card.