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AssigneeNEC Corporation
InventorsTakatoshi Kurano, Takayuki Kobayashi, Hiroshi Yamashita
Estimating the term…
In a routing system having a plurality of external input ports and a plurality of external output ports, a switch network having a plurality of internal input ports and a plurality of internal output ports, an input section between the external input ports and the internal input ports, an output section between the internal output ports and the external output ports, and a control section connected to the switch network and the input section, an input port number which may be assigned to each of the external input ports is arranged in a routing information field of a transmission path signal by an input port number setter included in the input section. The input port number is memorized in a discarded cell memory of the control section together with an internal output port number which is assigned to the internal output ports and which is derived from a routing table along with a header. On occurrence of a discarded cell, the cause of discard can be analyzed by the use of the input port number and the header. When a plurality of external input cells are multiplexed into a multiplexed input cell sequence, the input port number may be replaced by the internal output port number in the control section to effectively utilize the routing information field.
In a routing system for use in connection between a plurality of external input ports and a plurality of external output ports, said routing system comprising a switch network having a plurality of internal input ports, a plurality of internal output ports, and a switch circuit between said internal input ports and said internal output ports, an input section between said external input ports and said internal input ports, an output section between said internal output ports and said external output ports, and a control section coupled to said input section and said switch circuit for controlling said switch circuit to form internal paths between said internal input ports and said internal output ports, each of said external input ports being successively supplied with external input cells which carry headers identifying said external input cells, said external input ports and said external output ports having external input port numbers and external output port numbers assigned thereto, respectively, while said internal input ports and said internal output ports have internal input port numbers and internal output port numbers, the improvement wherein:
A routing system for use in connection between a plurality of external input ports and a plurality of external output ports, said routing system comprising a switch network having a plurality of internal input ports, a plurality of internal output ports, and a switch circuit between said internal input ports and said internal output ports, an input section between said external input ports and said internal input ports, an output section between said internal output ports and said external output ports, and a control section coupled to said input section and said switch circuit for controlling said switch circuit to form internal paths between said internal input ports and said internal output ports, each of said external input ports being supplied with external input cells each of which has a cell format divided into a payload field for transmission information and a header field for a header identifying a corresponding one of said external input cells, said external input ports and said external output ports having external input port numbers and external output port numbers assigned thereto, respectively, while said internal input ports and said internal output ports have internal input port numbers and internal output port numbers assigned thereto, respectively;
Dependencies are inferred from the claim text.