Friday, April 18, 2014

IEEE 1394

IEEE1394 interface was developed by Apple Inc. Same as USB, IEEE1394 can support peripheral hot swapping and providing power, connecting several difference devices and support synchronous data transmission.
Backplane mode and cable mode are two modes IEEE1394 used for data transmission.Backplane mode can be classified into 12.5 Mbps 25 Mbps50 Mbps ,the lowest rate is higher than USB1.1;Cable mode can be classified into several kinds such as 100Mbps, 200Mbps and 400Mbps; its the mode of high speed, can transmit uncompressed?high quality data for film.1394b is an updated version of 1394, its the only and specialized home network standard designed for audio, video, control and computer. It realized high performance home network through low cost, safety cat5. Long before the time of USB1.1, 1394a interface had possessed a great advantage for its higher speed, but after the coming out of USB2.0, 1394a interface did not possess a very apparent advantage. Meanwhile, many mainstream computers did not have a 1394 interface, if need to be used, relative connector should be used, which would undoubtedly increase the cost. External optical storages with unitary 1394 interface are basically few, mostly are with 1394 and USB together, the usage is more convenient.

The original design of IEEE1394 can allow user edit digital media archive directly thorough IEEE1394 interface to save the space of hard disk by using a computer. Before the coming out of IEEE1394, a special hardware should be used to edit digital media by downloading the film in a hard disk. As the trending of lower price for hard disk space, high speed IEEE1394 replaced USB2.0 to become the best interface for computer hard disk oppositely.Theoretically, 1394a can support the longest wire length 4.5m, have a standard transmitting rate of 100Mbps, and can support more than 63 devices.IEEE1394 has three protocol layers: transaction layer, Physical layer, Data link layer. Among them, transaction layer only support asynchronous transfer, synchronous transfer is provided by data link layer.
IEEE1394 inherited a mature SCSI instructional system and have a stable and efficient transmitting rate. Comparing with USB2.0, CPU has a lighter burden; even though IEEE1394a have a account value lower than USB2.0, the actual transmitting rate is higher than USB2.0,so it used widely for the high speed and stable data transmitting.


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