An initiating subsystem transfers a data set either in or out in subsets such as packets. Packet transfer is sequential, and transfer of a packet is contingent upon successful transfer of a previous packet. Actual data transfer to or from a destination, over a channel, is handled by a host interface....http://www.google.com.tw/patents/US7111086?utm_source=gb-gplus-share專利 US7111086 - High-speed packet transfer in computer systems with multiple interfaces
