Patent ID: 8255601

Claim:
A transmission system comprising: a first apparatus including a request transmitting unit that transmits a request packet as a request, and retransmits the request packet when a time period between the request and a response corresponding to the request exceeds a predetermined time period, and a response receiving unit that receives a response packet and a redundant response packet as the response and discards a response packet including an error and a redundant response packet identical to already received response packet; and a second apparatus coupled to the first apparatus via a transmission path through which the request from the first apparatus to the second apparatus is transmitted and the response from the second apparatus to the first apparatus is received, the second apparatus including a request receiving unit that receives the request packet, and a response transmitting unit that generates the response packet in response to the received request packet and the redundant response packet in response to a request that requires a sequential processing order to be guaranteed, and transmits the generated response packet and the generated redundant response packet to the first apparatus.