Patent ID: 7581017

Claim:
A data transmission system comprising a transmission apparatus and a reception apparatus, the transmission apparatus and the reception apparatus being connected via a transmission path, and data being transmitted from the transmission apparatus to the reception apparatus in an access unit that appears at a certain time interval and is allocated for the transmission path, wherein the transmission apparatus comprises a data packet generation means for: receiving transmission data (i) composed of consecutive data frames and (ii) having, for at least one data frame, a format that includes at least one of a preamble indicating a start of the data frame and a parity for detecting an error in the data frame; omitting the at least one of the preamble and the parity from one or more data frames included in the transmission data received within the certain time interval; adding, to one or more data frames (i) included in the received transmission data and (ii) having the at least one of the preamble and the parity omitted therefrom, a data length field indicating a number of bits of significant data; setting a remaining spare portion, of a data packet generated by the data packet generation means, as spare bits; and adjusting a length of the spare bits according to a difference between a clock rate used by the transmission apparatus and a clock rate used by the transmission path, to generate the data packet, including the one or more data frames, the data length field and the adjusted spare bits, as the access unit that is an entire length of the generated data packet, and wherein the reception apparatus comprises a data extraction means for receiving the access unit, and for adding, to the generated data packet of the received access unit, the at least one of the preamble and the parity omitted by the data packet generation means, to reconstruct the one or more data frames included in the transmission data received by the data packet generation means.