Patent ID: 7982545

Claim:
A transmission apparatus for computer network communication, comprising: a phase locking unit that phase locks between an input signal and an output signal corresponding to the input signal based on a reference frequency signal determined by a clock signal obtained; an internal fixed frequency oscillator that oscillates a clock signal of a predetermined frequency; a switching controlling unit that, when the input signal is interrupted or switched, controls the phase locking unit so as to obtain the clock signal for generation of the reference frequency signal by switching the clock signal from a clock signal of the input signal to the clock signal oscillated by the internal fixed frequency oscillator; and a frequency divider that divides the frequency of the clock signal oscillated after the clock signal is switched by the switching controlling unit, and outputs the clock signal to the phase locking unit, the internal fixed frequency oscillator outputting the clock signal to the switching controlling unit, triggered by the interruption of the input signal.