1394 interface, IEEE1394 bus is a high-speed serial bus, also known as "FireWire", which supports hot plugging, real-time data transmission, bus structure, plug and play. It is used to connect digital products with computers and other machines. It is widely used in the industrial field. The protocols and coding methods are very good, and the transmission speed is stable. The highest transmission speed of 1394a is 400Mbps, and the highest transmission speed of 1394b is 800Mbps, such as 3.2Gb, but it is relatively rare and the interface penetration rate is low. It was monopolized by Apple in the early days, and the computer usually does not contain its interface, so additional capture cards are required. Need to pay attention to its PacketSize data packet size settings. Packet Size is the bandwidth of the entire 1394 bus. With less CPU resources, multiple units can be used at the same time, but due to the low penetration rate of the interface, it has been gradually eliminated by the market. The 1394 interface is divided into 4 cores and 6 cores. There are two pairs of data lines in the 4 cores, and the 6 cores exclude data. It also includes a set of power cords to supply power to external devices. The IEEE 1394 interface does not require a controller and can realize peer-to-peer transmission. The maximum transmission distance of 1394a is 4.5 meters, and the transmission distance of 1394b is usually 10 meters. It can be extended to 100 meters (100Mbps) when the data rate is reduced. Relay equipment is used. Support can further increase the transmission distance.
