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三、交换单元1.时分交换单元2.空分交换单元3.单通路网络ATM交换机设计中最常使用的单通路、自选路由互连网络如图4所示.(1)纵横棒网:“纵横棒”这一术语源自于模拟电话系统单通路、无阻塞交换单元的特定设计.它采用图4c所示拓扑结构,其中每个有源元件即交叉点都是单个的电接点.现在,该术语用来描述任何复杂度按照N~2的函数增长的单通路无阻塞网络(其中N为输入和输出端口数).在此含义下,图4a,b,c的拓扑结构都是纵横棒设计,其差别仅在于输入和输出端口采用总线还是分离的通路.图4a和4b的全互连网络又称为带有N~2分离通路的网络.
Third, the exchange unit 1. Time switch unit 2. Air separation unit 3. Single-pass network ATM switches in the design of the most commonly used single-pass, optional routing interconnection network shown in Figure 4. (1) Vertical bar network: The term “bar” originates from the specific design of a single-pass, non-blocking switching unit of an analog telephone system that uses the topology shown in Figure 4c where each active element, ie the intersection, is a single electrical contact Now, The term is used to describe any one-way non-blocking network (where N is the number of input and output ports) of any complexity that grows as a function of N ~ 2. In this sense, the topologies of Figure 4a, b, c are both vertical bars Design, with the only difference being whether the input and output ports are bus or separate. The fully interconnected network of Figures 4a and 4b is also known as a network with N ~ 2 split paths.