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    Cell switching system of asynchronous transfer mode
    1.
    发明授权
    Cell switching system of asynchronous transfer mode 失效
    异步传输模式的小区切换系统

    公开(公告)号：US4947388A

    公开(公告)日：1990-08-07

    申请号：US333282

    申请日：1989-04-05

    申请人： Hiroshi Kuwahara ,  Mineo Ogino ,  Takahiko Kozaki ,  Noboru Endo ,  Yoshito Sakurai

    发明人： Hiroshi Kuwahara ,  Mineo Ogino ,  Takahiko Kozaki ,  Noboru Endo ,  Yoshito Sakurai

    IPC分类号： H04Q3/00 ,  H04L12/931

    CPC分类号： H04L12/5601 ,  H04L49/108 ,  H04L49/203

    摘要： A fixed-length packet switching system, in which fixed-length packets (cells) each composed of a header portion and a data portion are received from a plurality of input lines, and after conversion of the header portions, the received packets are transmitted onto selected ones of output lines designated by their header portions. The system includes a buffer memory having a first buffer area composed of a plurality of subsidiary areas for accumulating cells correspondingly to the output lines, and a second buffer area for accumulating broadcast cells to be transmitted to selected ones of the plurality of output lines; a packet reading circuit for reading the cells from the first buffer area successively corresponding to the output lines and for reading the broadcast cell from the second buffer area at a predetermined frequency; and a broadcast control circuit for reproducing a plurality of broadcast cells from the broadcast cells read from the second buffer area and for transmitting the plurality of reproduced broadcast cells, instead of the cells read from the first buffer area, onto the output lines. The buffer memory is divided into a plurality of buffer areas each corresponding to a respective output line and a packet writing circuit generates addresses sequentially for the respective buffer areas to store cells in a buffer area according to the header portion thereof.

    Method and system for packet exchange
    2.
    发明授权
    Method and system for packet exchange 失效
    分组交换的方法和系统

    公开(公告)号：US4964119A

    公开(公告)日：1990-10-16

    申请号：US334211

    申请日：1989-04-06

    申请人： Noboru Endo ,  Takahiko Kozaki ,  Hiroshi Kuwahara ,  Kenichi Ohtsuki ,  Shinobu Gohara

    发明人： Noboru Endo ,  Takahiko Kozaki ,  Hiroshi Kuwahara ,  Kenichi Ohtsuki ,  Shinobu Gohara

    IPC分类号： H04L12/801 ,  H04L12/931

    CPC分类号： H04L49/103 ,  H04L49/25 ,  H04L49/254 ,  H04L49/30 ,  H04L49/3009

    摘要： In a packet exchange system for preforming packet exchange by setting logical channels, individual input packets are assigned with information indicative of input sequence of the individual input packets counted in each call and the input sequence information is stored. Each time each packet is delivered, the input sequence information assigned to an input packet is stored as an output sequence information in a call to which the delivered packet belongs, and the status of congestion of packets of the call which are present in the exchange is decided on the basis of the stored input sequence information and output sequence information. This system further includes a rerouting circuit having buffer function and a control device for changing the contents of a conversion table when it detects by looking up the conversion table that the number of packets remaining in the exchange which are destined for a specified output line exceeds a predetermined threshold, whereby input packets scheduled to be destined for the specified output line are temporarily stored in the rerouting circuit.