Cell-sorting device for creating synchronous variable-length optical packet switches
Cell-sorting device for creating synchronous variable-length optical packet switches
复制标题
用于创建同步可变长度光包交换机的信元分选装置
DOI：
10.1109/jlt.2003.810107
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Narula
中科院分区：
文献类型：
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作者：
P. Lin;A. Narula
我们考虑同步可变长度光分组交换机的设计。如果数据包首先被分成多个固定长度的信元，则固定长度数据包交换机可用于交换可变长度的数据包。然而，对于许多固定长度交换机架构，来自多个数据包的信元将分散，并且将无法保留数据包完整性。我们描述了基于光纤延迟线的信元分类器的设计，当附加到固定长度数据包交换机的输出时，通过使可变长度数据包连续退出，将交换机转换为可变长度数据包交换机。我们描述了细胞分选器的两种实现方式。第一个只是一组延迟线。第二种使用两级时隙交换，并将延迟线元件的数量减少为最大数据包长度的对数函数。我们还估计了由此产生的可变长度数据包交换机的数据包阻塞概率，并通过模拟验证我们的结果。
We consider the design of a synchronous variable-length optical packet switch. Fixed-length packet switches may be used to switch variable-length packets if the packets are first divided into multiple fixed-length cells. However, for many fixed-length switch architectures, cells from multiple packets will become interspersed, and packet integrity will not be preserved. We describe the design of a fiber-delay-line-based cell sorter that when appended to the output of a fixed-length packet switch converts the switch into a variable-length packet switch by enabling variable-length packets to exit contiguously. We describe two implementations of the cell sorter. The first is simply a bank of delay lines. The second uses two stages of time-slot interchange and reduces the number of delay line elements to be a logarithmic function of the maximum packet length. We also estimate the packet-blocking probabilities of the resulting variable-length packet switch and verify our results via simulation.