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    • 4. 发明授权
    • Method and system for switching packets
    • 切换数据包的方法和系统
    • US07525995B2
    • 2009-04-28
    • US11099582
    • 2005-04-06
    • Ofer Iny
    • Ofer Iny
    • H04J3/24
    • H04L49/254H04L49/15H04L49/1523H04L49/3018H04L49/3027
    • A system for switching variable size packets in a network is disclosed. The system comprises at least one ingress controller which receives a plurality of packets and which segments each of the packets into fixed sized fragments. The at least one ingress controller has a time-clock. The time clocks of all ingress controllers are synchronized to within a tolerance. Each fragment is tagged with at least a unique source of ID, time-stamp, and a fragment-number to form a cell. Each cell belongs to one packet having the same time-stamp value. The ingress controller sends each of the cells through a link such that a cell's destination is reachable through that link. The system includes a fabric element which receives cells from a plurality of inputs links. The cells are ordered. The fabric element sends ordered cells through a plurality of outputs and through which the destination of the cells is reachable. The cell order is defined such that a cell ahead of another either has a lagging time stamp, or if the timestamp is the same the cell ahead of another has a source-id which has a predetermined priority, or if both the timestamp and the source-id are the same the cell ahead of another has a lagging fragment-number. The system finally includes at least one egress controller which receives the ordered cells from the plurality of input links, and sends the ordered cells through an output where such order results in complete packets. A packet switching device in accordance with the present invention solves the cell ordering and packet reassembly issues using a unified distributed method in a multi-stage interconnect network.
    • 公开了一种用于在网络中切换可变大小分组的系统。 该系统包括至少一个入口控制器,其接收多个分组,并且将每个分组划分成固定大小的分段。 所述至少一个入口控制器具有时钟。 所有入口控制器的时钟同步到公差范围内。 每个片段至少标识一个唯一的ID源,时间戳和片段号以形成一个单元格。 每个小区属于具有相同时间戳值的一个分组。 入口控制器通过链路发送每个小区,使得小区的目的地可通过该链路到达。 该系统包括从多个输入链接接收单元的结构元件。 细胞是有序的。 织物元件通过多个输出发送有序单元,并且单元的目的地可通过该单元到达。 单元顺序被定义为使得另一个之前的单元格具有滞后时间戳,或者如果时间戳相同,则另一个之前的单元具有具有预定优先级的源代码,或者如果时间戳和源 -id是相同的,在另一个之前的单元格具有滞后的片段号。 系统最终包括至少一个出口控制器,其从多个输入链路接收有序单元,并且通过输出发送排序单元,其中这样的订单导致完整的分组。 根据本发明的分组交换设备使用多级互连网络中的统一分布式方法来解决小区排序和分组重组问题。