Media Oriented Systems Transport (MOST)

Address: http://www.vector.com/vi_most_en.html

The most specification not only defines the physical layer and data link layer, but also covers Layer 7 of the ISO/OSI reference model. The unified interface makes it easier for communication devices to implement the most protocol. For application developers, most is mainly used as a Protocol definition. Users can obtain a unified object-oriented interface (Application Programming Interface-API) to implement device functions.

Most system services provide communication functions: underlying system services, basic layer system services, and application sockets. The underlying system service (Layer 2 Service) is a most Transceiver Based on the physical layer. Between the most transceiver and API (Layer 7) is the most network service, which consists of the basic layer system service (Layer 3, 4, 5) and application socket (layer 6 ).

The most network is usually a ring network with a maximum of 64 devices. It is not complex to add or delete devices because pluggable devices are supported. Given specific topology conditions, you can use a star network-a double-ring network may be used in security applications.

In a most network, a most device acts as a time server to continuously provide most frames to the ring network. The packet starting from the transmitted most frame can be synchronized at slaves. According to the binary encoding in synchronous transmission, slaves can continue to synchronize its clock.

The total bandwidth available for transmitting data streams (synchronous data transmission) and data packets (asynchronous data transmission) is close to 23 MB. The channel is divided into 60 physical channels, which can be selected and configured. Most provides multiple services and mechanisms for allocating (and releasing) Physical channels.

Most supports up to 15 cd-quality stereo audio channels, or up to 15 mpeg1 channels for audio and video transmission. However, most currently does not support transmission of HD and non-compressed video data streams.

Meanwhile, most provides a channel for transmitting and controlling messages. The bandwidth of this channel is 768 kb. In other words, 3000 Control messages can be transmitted per second. The control message can be used to configure the most device or synchronous or asynchronous data transmission.

Address: http://blog.csdn.net/donhao/article/details/6727258