Hard Real-time Business Ethernet

With the wide application of Ethernet in various working areas, there come across more and more requests on the capacity of the transmission of Ethernet. Ethernet is not only used in the traditional transmission of non real-time data, but also expected to be used as the basis of bottom-data transmission in some fields of real-time data transmission. Nowadays, because of its advantages of wide application, inexpensiveness, high-rate communication, abundant production of hardware and software, developed applying supporting technology, etc. Ethernet has already been widely applied in resource management and execution manufacture in the system of integrative automatization of industry and enterprise. It also extends downwards the application in the industry-controlling field. It is expected not only to meet the needs of the timeliness, bandwidth, reliability and performance-to-cost ratio of Ethernet in the field of industry control, but also to make use of the net resources to mix-transmit soft-real-time data and non real-time data during the vacancy of transmitting hard-real-time data. This thesis researches about Ethernet both in theory and in practice, and it has obtained much useful results and breakthrough. At first, this thesis deeply explores the current real-time and non real-time Ethernet, and discusses industrial Ethernet technology. At the same time, it explores thoroughly about scheduling algorithm of the real-time communication of field-bus network. Then it discusses the token bus medium access control protocol, the basic implementation technologies of real-time LAN and the key technology of Ethernet that applied in the communication between the equipments in the industry field. This thesis also clarifies the thoughts of research and setting up the system of real-time communication. On the basis of the above statements, the main principle and mechanism of the Hard-Real-Time Integrated Services Ethernet has been well studied. It is chiefly researched from the following aspects: 1. Research of the system of RISE: On the basis of the analyzing the current real-time and non real-time Ethernet, this thesis puts forward the systematic structure which is a kind of system of integrated services network on the basis of Ethernet technology. Without changing the hardware equipment of Ethernet, the systematic structure accomplishes both the communication of hard-real-time data under the mode of RTCC, and the transmission of soft-real-time data and non real-time data under the mode of RETHER. 2. The main driven-model of RISE: a time-event complex network driven model whose core is a globe timer under the mode of RTCC and a token-bus network driven model under the mode of RETHER. These two driven-models can be managed to cooperate harmoniously with each other by a driven-model mediator. This thesis also analyses the guarantee of the mode switch-time in detail. 3. The message mechanism corresponding with the RISE protocol driven-model, 7 kinds of message type and frame data structure for RISE. 4. The elaborated discuss about the capability of time delay of RISE protocol and static and dynamic bandwidth. 5. An experimental prototype of integrated services communication network based on Ethernet, called RISES, is realized. RISES possesses integrated structure and functions. RISES uses the different mode according to the different data transfer requirements and it establishes the different data traffic type according to the different real-time requirements. As a result, the protocol realizes the preemptive data traffic. By analyzing and testing RISES in this thesis, it proves the practicability and rationality of communication technologies of hard-real-time integrated services Ethernet. Because there are few researches on the integrated services data of transmitting real-time data and non real-time data of integrated services Ethernet both at home and abroad, many relevant problems need to be explored. This thesis probes into the integrated services communication, timeliness and reliability of Ethernet systematically, and it puts forward the practicable solution. Our final goal is to apply our energies to exploit integrated services network interface standard and products...