Patent ID: 7672341

Claim:
A transmission apparatus, comprising: a first synchronism section for detecting synchronism of a reception frame based on a first framing pattern of a first type frame; a second synchronism section for detecting synchronism of the reception frame based on a second framing pattern of a second type frame; a mapping section for mapping the reception frame to a third type frame based on the detections of synchronism by said first and second synchronism sections; and an inhibit section for judging that a current reception frame is said first type frame when said first synchronism section has detected the synchronism in a preceding reception frame, which is a previous frame of the current reception frame in a time axis, and said first and second synchronism sections detect the synchronisms in the current reception frame, and invalidating fault information set in a fourth type frame, wherein a head position of said each reception frame is determined by one of said first and second framing patterns for frame synchronism, each reception frame only containing one of said first and second type frames, and a frame header of said first type frame, which contains said first framing pattern, is different from a frame header of said second type frame, which contains said second framing pattern.