Patent ID: 7522533

Claim:
An optical transmission apparatus having a path trace function of carrying out a conductive state check of a path in a synchronous optical transmission network, comprising: a first judgment unit judging a path trace format of an existing standard corresponding to a SONET, in response to a detection of a first specific code contained in a path trace data; a second judgment unit judging a path trace format of a new standard corresponding to an SDH, in response to a detection of a second specific code contained in the path trace data; a third judgment unit specifying one of the path trace formats of a plurality of the new standards, in accordance with a content of a third specific code which is contained together with the second specific code in the path trace data; and a unit reporting a judgment result of the path trace format, and a SONET/SDH mode based on a value of an SS bit being defined at a fifth bit and a sixth bit within an H1 byte of a SONET/SDH frame, to a maintainer terminal.