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    • 3. 发明授权
    • Method for collecting information about physical constitution of lan
system, method of specifying collision terminals, and method for
detecting noise-generated position
    • 用于收集关于lan系统的体质信息的方法,用于指定碰撞终端的方法以及用于检测噪声产生位置的方法
    • US6122257A
    • 2000-09-19
    • US815854
    • 1997-03-12
    • Naoyoshi MachidaToshihito OchiHiromi KawaguchiMineo OginoMasahiko KurataMasato TachibanaTadayuki Ichiba
    • Naoyoshi MachidaToshihito OchiHiromi KawaguchiMineo OginoMasahiko KurataMasato TachibanaTadayuki Ichiba
    • H04L12/24H04L12/26H04J1/16G01S13/32
    • H04L12/2697H04L43/50H04L41/12
    • In a bus type LAN, the data transmitted from a terminal (14) is detected by an adapter (1) connected to one end of a bus (3), and in response thereto the adapter (1) transmits a pulse signal onto the bus (3). An adapter (2) connected to the other end of the bus (3) receives the data transmitted from the terminal (14) and detects its source terminal address. A difference in time between the arrival of the data from the terminal (14) and the arrival of the pulse signal from the adapter (1) is measured by a counter circuit (21), and the count value obtained is stored in a memory (23), forming a pair with the corresponding source terminal address. Thus, the count value can be obtained for each terminal during the normal operation of the LAN. The data of the memory (23) are extracted by a personal computer (5), where the physical position of each terminal is calculated in accordance with the bus propagation velocity, and is displayed or printed out as a physical constitution diagram. Also, the packet signal, its collision signal, the jam signal and the pulse signal are utilized to measure the difference in time for the arrival of the pulse signal and so forth, to thereby specify the terminal having caused the packet collision.
    • PCT No.PCT / JP95 / 01803 Sec。 371日期1997年3月12日 102(e)1997年3月12日PCT PCT 1995年9月12日PCT公布。 公开号WO96 / 08897 日期1996年3月21日在总线型LAN中,从连接到总线(3)的一端的适配器(1)检测从终端(14)发送的数据,并且响应于适配器(1)发送 脉冲信号到总线上(3)。 连接到总线(3)的另一端的适配器(2)接收从终端(14)发送的数据并检测其源终端地址。 通过计数器电路(21)测量来自终端(14)的数据的到达与来自适配器(1)的脉冲信号的到达之间的时间差,将获得的计数值存储在存储器 23),与对应的源终端地址形成一对。 因此,在LAN的正常操作期间可以为每个终端获得计数值。 存储器(23)的数据由个人计算机(5)提取,其中根据总线传播速度计算每个终端的物理位置,并作为物理结构图被显示或打印出来。 此外,分组信号,其冲突信号,阻塞信号和脉冲信号用于测量脉冲信号等到达时间的差异,从而指定引起分组冲突的终端。