| 摘要 |
A VT (Virtual Tributary) size setting section 3 allows selection of the VT size desired by the user of the apparatus by accepting setting data inputted by the user of the apparatus. The VT size comparing section 4 compares the VT size detected at the VT size receiving section 2 with the VT size set by the VT size setting section 3 in order to detect coincidence or noncoincidence. The data outputting section 5 executes the predetermined data processing of data extracted from a SONET (Synchronous Optical Network) transmission signal in accordance with the VT size set by the VT size setting section 3 when the result of the comparison at the VT size comparing section 4 indicates coincidence, but executes error signal processing when the result of comparison at the VT size comparing section 4 indicates noncoincidence.
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