What is the IEEE1394 interface?

The IEEE1394 interface is a serial standard developed by Apple. The Chinese translation is called firewire. Like USB, IEEE1394 also supports peripheral hot swap, which can provide power for peripherals, eliminating the power supply of peripherals, connecting multiple different devices, and supporting synchronous data transmission. IEEE1394 is divided into two transmission modes: Backplane mode and Cable mode. The minimum rate of Backplane mode is also higher than the maximum speed of USB 1.1, which is 12.5 Mbps, 25 Mbps, and 50 Mbps, respectively, and can be used in most high-bandwidth applications. The Cable mode is a very fast mode, divided into 100Mbps, 200Mbps and 400Mbps. It can transmit uncompressed high-quality data movies at 200Mbps. 1394b is an upgraded version of 1394 technology and is the only home networking standard designed specifically for multimedia - video, audio, control and computers. It implements a high-performance home network with low-cost, secure CAT5 (Category 5). 1394a has been offering products since 1995, and 1394b is a backward compatibility extension for 1394a technology. 1394b can provide 800 Mbps or higher transmission speed. Although there is no 1394b optical storage product on the market, it is believed that it will appear in front of users soon. Compared with the USB interface, in the early era of USB1.1, the 1394a interface occupies a great advantage in speed. After the introduction of USB2.0, the advantage of the 1394a interface in speed is not so obvious. At the same time, most of the mainstream computers are not equipped with a 1394 interface. To use the relevant interface card, additional costs are required. At present, the external optical storage of the simple 1394 interface is basically small, and most of them are multi-interface products with 1394 and USB interfaces at the same time, and the use is more flexible and convenient. The original design of IEEE 1394 is based on its high-speed transfer rate, allowing users to edit electronic image files directly on the computer through the IEEE1394 interface to save hard disk space. Before IEEE 1394 was used, editing electronic images had to use special hardware to download the movie to a hard disk for editing. However, as the hard disk space becomes cheaper and cheaper, the high-speed IEEE 1394 replaces the USB 2.0 and becomes the best interface for the external computer hard disk. The 1394A can support the theoretical longest line length of 4.5 meters, and the standard normal transmission rate is 100Mbps and supports up to 63 devices. IEEE 1394a-2000 (FireWire 400) is almost identical to IEEE 1394-1995, and new specifications developed after several places have been improved. In order to be different from IEEE 1394b to be described later, it is called FireWire 400. When used in industry, it is sometimes referred to simply as ".a". IEEE 1394b-2002 (FireWire 800) FireWire 800 is a high-speed specification with a theoretical maximum speed of 800 Mbps. It is compatible with IEEE 1394a, but the shape of the connector is changed from 6 pin of IEEE 1394a to 9 pin, so it needs to be connected via a patch cord. When used in industry, it is sometimes referred to simply as ".b". IEEE 1394c-2006 (FireWire S800T) FireWire S800T was released on June 8, 2007, providing a major technical improvement. The new connector specifications are identical to those of the RJ45, and use CAT-5 (Category 5 twisted pair) and the same Automatically, the same port can be used to connect any IEEE 1394 device or IEEE 802.3 (1000BASE-T Ethernet twisted pair) device. Although it sounds quite attractive, until October 2008, there were no products or chips on the market, including this ability. The S1600 and S3200 IEEE 1394 promotion group, the 1394 Trade Association, announced in December 2007 that it will be able to use the new expansion specification S1600 (theoretical value of 1.6 Gbit/s) and the S3200 mode (theoretical value of 3.2 Gbit/s) by the end of 2008. . This expansion specification uses the 9-pin connector and cable that FireWire800 now uses, and will be fully compatible with FireWire 400 and FireWire 800 devices. This is to prepare for the USB 3.0 specification. This article comes from [System Home] www.xp85.com