Patent ID: 7904582

Claim:
A network relay apparatus connected to a plurality of lines to conduct data transfer via the lines, comprising: a central control unit for controlling an operation state of the network relay apparatus; and a transfer engine unit comprising a plurality of network LSIs (large-scale integrated circuits) mutually connected via channels, the transfer engine unit conducting transfer processing on data received from the lines, wherein the network LSIs comprise: a plurality of function blocks for implementing the data transfer; a load judgment unit for judging loads laid upon the function blocks; and a frequency voltage control unit for supplying a clock and an operation voltage to each of the function blocks on the basis of the loads obtained by the judging, and wherein further: the central control unit judges an operation state of each of the lines by analyzing a first control information frame received from the line, the first control information frame indicating which one of a standby system line and an operational system line the line on which the first control information frame is transmitted is, the load judgment unit judges a load of a corresponding function block on the basis of the operation state of the line obtained by the judging, and the frequency voltage control unit supplies the clock and the operation voltage to the function block depending on the judged load of the function block.