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A 1394 Bus system, previously known as IEEE 1394, is a computer bus for high-speed communications. It utilizes a high speed serial bus, which is shorted for IEEE 1394b and IEEE 1394a, and it\'s now called 1394. It is commonly used in consumer audio/video cable connections between a number of IT related goods and in many different automotive applications. The speed of the connection can be up to 400Mbps, 8-bit isochronous data transmission, extremely low-latency, and most importantly, isochronous data transfer capability. The features of the 1394 bus system is making it ideal for many situations such as audio and video editing suite and professional digital recording system.

The application field of 1394 Bus system is mainly about the entertainment and automotive industries. Consumer electronic goods like digital camcorders, digital cameras, video game systems, DVD players, or audio players are regularly using 1394 Bus system. Moreover, it is also widely used in automotive such as network entertainment systems, vehicular infotainment systems, 3D gesture systems, invehicle entertainment networks, in-vehicle radar systems, and vehicle-to-vehicle communications.

The main working principle of 1394 Bus system is based on the shared token bus media access method. There are several methods of transferring data on the 1394 Bus system, including asynchronous data transfer, isochronous data transfer, isochronous multicast, and broadcast transfers, and memory response packets. The 1394 Bus system also features a plug-and-play architecture which makes it easier to connect and configure devices. Asynchronous data transfers are used for transferring non-time-critical data efficiently, while isochronous data transfers are used for time-critical data.

As a summary, the 1394 Bus system is a computer bus for high-speed communications. Its application fields mainly focus on entertainment and automotive industries. It also features a plug-and-play architecture which makes it easier to connect and configure devices. The main purpose is based on the shared token bus media access method which allows asynchronous data transfers and isochronous data transfers to be used for transferring non-time-critical and time-critical data respectively.

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