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缓冲区插入型环是一个单向子网.图(1)画出了它的结构和站内的信息流向.其中Mr为由其他站发往本地站的信息,M_s为由本地站转接的信息,M_i为由本地站产生并发往其他站的信息,M_i和M_o分别为总的输入和输出信息.假定所有的信息都为定长,信息中数据和信息头的长度分别为L_p和L_h位、如果环人传输速率为V位/秒,环的服务速率为μ,则
The buffer insertion ring is a one-way subnet. Figure (1) shows its structure and the flow of information in the station, where Mr is the message sent from the other station to the local station and M_s is the message relayed by the local station , M_i is the information generated by the local station and sent to other stations, M_i and M_o are the total input and output information respectively. Assuming that all the information is fixed length, the length of the data and information header in the information is L_p and L_h respectively , If the ring transmission rate is V bits / second and the ring service rate is μ, then