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    • 7. 发明专利
    • DE3851084D1
    • 1994-09-22
    • DE3851084
    • 1988-05-13
    • HITACHI LTD
    • HAGIWARA MASAYOSHISUZUKI MICHIOSASAKI RYOICHISUGANO MINORUHORIKI AKIRAHAYASHI KAZUYUKI
    • H04L12/54H04L12/56
    • In order to enable an expansion of a packet switched network and a constitution change thereof to be readily achieved in a multistage switched network constitution, in a packet switched network (1110) including a packet data terminal (111), a packet switching equipment (118), a PBX (113), a multiplexer (116), an LAN (112), a voice communication apparatus such as a telephone set (115), and a facsimile or in a linkage between switching modules in a packet switching apparatus, the basic switching modules called configuration units (4, 109) connected to the network are interconnected to each other to form a hierarchic tree structure of which the number of hierarchic levels can be selected depending on a size of the packet switched network. Furthermore, in order to increase the reliability of the packet data transfer in the multistage switched network configuration, there are disposed a plurality of connecting lines between bit switches (FIG. 3, 23-25, 40-44, 60-68) and upper-level configuration units so as to establish a redundant configuration.