Patent ID: 8713402

Claim:
A transmission system including a plurality of transmission devices carrying out sending and receiving of OPTICAL CHANNEL TRANSPORT UNIT frames, the transmission system comprising: a first transmission device carrying out the sending of an OPTICAL CHANNEL TRANSPORT UNIT frame; and a second transmission device carrying out the receiving of the OPTICAL CHANNEL TRANSPORT UNIT frame sent from the first transmission device, wherein the first transmission device includes a first storage portion for storing first calculation range information indicating either one of a first area including OPTICAL-CHANNEL PAYLOAD UNIT only and a second area at least including an arbitrary byte of OPTICAL CHANNEL TRANSPORT UNIT/OPTICAL DATA UNIT overhead as an area for calculating a bit interleaved parity of 8 bits, a first calculation portion for calculating the bit interleaved parity of 8 bits for an area determined by the first calculation range information among areas of the sending OPTICAL CHANNEL TRANSPORT UNIT frame, and an insertion portion for inserting a calculation result of the bit interleaved parity of 8 bits from the first calculation portion into the sending OPTICAL CHANNEL TRANSPORT UNIT frame; and wherein the second transmission device includes an extraction portion for extracting the bit interleaved parity of 8 bits from the received OPTICAL CHANNEL TRANSPORT UNIT frame, a second storage portion for storing second calculation range information indicating the same calculation range as the first calculation range information as an area for calculating a bit interleaved parity of 8 bits, a second calculation portion for calculating the bit interleaved parity of 8 bits for an area determined by the second calculation range information among areas of the received OPTICAL CHANNEL TRANSPORT UNIT frame, and an error detection portion for detecting error by comparing a calculation result of the bit interleaved parity of 8 bits from the second calculation portion with the bit interleaved parity of 8 bits extracted by the extraction portion.