Patent ID: 8265063

Claim:
A transmission system receiving from a node on a transmission path multiplexed data in which synchronous data and asynchronous data are multiplexed and unified as frames of the asynchronous data, comprising: a packet switch switching asynchronous data which is a MAC frame; and a straight-through processing unit extracting a tag from each item of demultiplexed data, the tag including destination information and type information to identify whether each item of the demultiplexed data is synchronous data or asynchronous data, determining whether each item of the demultiplexed data is first data which is synchronous data and is not addressed to said packet switch, based on the type information included in the tag, transmitting the first data to the node of said transmission path, and transferring second data other than the first data to said packet switch, the second data including synchronous data which is addressed to the packet switch.