The predecessor of EEE1394 is Firewire, a transmission interface developed by Apple Computer for high-speed transmission in 1986, and was approved by the American Society of Electrical and Electronics Engineers in 1995 as an official new standard. The IEEE1394, Firewire and i.LINK mentioned earlier refer to this standard. It is often called IEEE1394 in the PC industry market, i.LINK in the home appliance industry, and the earliest Firewire in the Mac group.
IEEE1394 has developed to two versions now, namely IEEE1394.a and IEEE1394.b. Among them, IEEE1394.a is the standard adopted by the current equipment, and equipment adopting the IEEE1394.b standard will also be launched soon. The contents of the IEEE1394 standard are: a. It supports hot swap and plug-and-play, and provides a point-to-point transmission function, so that it is not necessary to use a computer to transfer data between devices. As long as any new device is added, the The device will automatically obtain an identification code instead of the traditional address; b. In terms of transmission, it can support both synchronous and asynchronous transmission functions; c. The maximum transmission speed of IEEE1394.a is 400Mbps, and the specification of IEEE1394.b The maximum can reach 3.2Gbps; d.IEEE1394 is an interface across PC and home appliance product platforms, suitable for products that require high-speed data transmission, such as high-speed external hard drives, CD-ROM, DVD-ROM, scanners, printers, digital Cameras, cameras, etc .; e. IEEE1394 can connect up to 63 devices; f. IEEE1394.a specifications, the maximum distance between two nodes is 4.5 meters, and IEEE1394.b specifications are 100 meters.
The future development direction of IEEE1394 can be divided into three parts:
1. Home network and SOHO family applications
The rise of home networking and the SOHO family will be one of the driving forces driving the growth of IEEE1394. According to IDC statistics, in the United States, the number of households with Internet and SOHO families will increase from 1.9 million and 1.3 million in 1999 to 12 million and 8.2 million in 2002. Because IEEE1394 has the advantages of high-speed transmission, it supports various functions of point-to-point connection and hot plug, and can connect 63 devices at the same time. In addition, the additional 1394 wireless transmission specification under development is also expected to Growth.
2. Development of information appliances
The application field of IEEE1394 will be expanded to communication and information appliances. With the opening of the high-speed information network, the home network connected by IEEE1394 will communicate through ADSL (Asymetric Digital Subscriber Line), LMDS (LocalMulTIpointDistributedSystem), cable TV network, and digital TV broadcast network, so that each user's family can enjoy high-speed information communication services. Development will be limitless. In addition to the use requirements of CE (Consumer Electronics), IEEE1394, which is suitable for transmitting image information, has developed rapidly in the context of the rapid growth of the Internet and the development of information appliances (IA). According to IDC estimates, the global IA sales can reach 89 million units in 2004, and the market size can reach 17.8 billion US dollars, which will be a very important market for IEEE1394. Because the characteristics emphasized by IA are simple and easy to use, low unit price, and Internet access, coupled with the current Internet connection, the demand for audio and video information transmission will be greater and greater, especially the price of IEEE1394 chipset can be reduced to 5--3 US dollars In the future, it will attract more IA manufacturers to support and equip the IEEE1394 interface in their products, and then IEEE1394 will provide a fairly good solution.
3. Development of wireless transmission
IEEE1394 has a specification called P1394.1 for wireless transmission. Although P1394.1 is still in the formulation period, IEEE1394 will be a good candidate for wireless transmission interface in terms of wireless transmission. The combination of wired and wireless 1394 interfaces will certainly be invincible in the future home network. At present, Canon and NEC have also proposed IEEE1394 as the prototype of the wireless transmission network. In the prototype structure of NEC, the transmission distance can reach 12 meters. By the end of 2000, manufacturers will gradually propose a more complete architecture. Â
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