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集中处理信元缓冲的ATM交换机结构复杂、扩展性不好、不易保证高吞吐率 ,而由多级交换单元分布处理信元缓冲可克服这些缺点 .用 2× 2交换单元以Banyan网结构组成ATM交换机是较可行的方案 .为此计算了 2× 2输出缓冲ATM交换单元和 2× 2中央缓冲ATM交换单元的最大吞吐率、信元丢失率、平均时延 ,并以此为基础分析了整个ATM交换机的性能 .结果表明 ,中央缓冲方式的管理复杂度和存取速度要比输出缓冲方式高 ,但是在相同网络负荷和相同信元丢失率的条件下 ,中央缓冲方式所需的队列量要远小于输出缓冲方式所需的队列容量。另外 ,两者在相同网络负荷条件下的信元延迟是相同的 .
The ATM switchboard that concentrates on cell buffering has a complex structure and poor scalability, which is not easy to ensure high throughput, while the cell buffer distributed by multilevel switching units can overcome these disadvantages. A 2 × 2 switching unit is used to construct an ATM Switch is a more feasible solution.For this purpose, the maximum throughput, cell loss rate and average delay of 2 × 2 output buffer ATM switch unit and 2 × 2 central buffer ATM switch unit are calculated, and based on this, the whole ATM switch performance.The results show that the central buffer management complexity and access speed than the output buffer mode, but in the same network load and the same cell loss rate conditions, the central buffer mode required to the amount of the queue Much less than the output buffer required queue capacity. In addition, the cell delay is the same under the same network load.