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    • 3. 发明授权
    • Control system for configuring ring LAN with improved reconfiguration
operation
    • 通过改进的重新配置操作配置环网的控制系统
    • US5351040A
    • 1994-09-27
    • US755118
    • 1991-09-05
    • Fumiaki MatsuuraKazuhiro UshijimaHisashi MatsumuraMasahide KouheiTsutomu Koita
    • Fumiaki MatsuuraKazuhiro UshijimaHisashi MatsumuraMasahide KouheiTsutomu Koita
    • H04L12/437H04Q3/00
    • H04L12/437
    • In a ring LAN system having a configuration control unit serially connected to a dual ring transmission line, the configuration control unit is provided with a transmission line reconfiguration control mechanism to disconnect a fault point upon detection of a transmission fault, such as a breaking of one of a twisted pair of cables, and after recovery of the fault, reconnect the disconnected point to restore the transmission line to its original state. The reconfiguration control mechanism suspends reconfiguration control if a reconfiguration operation counter counts more than a predetermined number of reconfiguration operations within a predetermined time period measured by a reconfiguration operation monitor timer, such as when a temporary fault occurs intermittently. However, operation of such reconfiguration control suspension is initially suspended after system start up, such as when transmission line signals are attenuated and appear as faults, until after an elapsed time after system start up measured by a lapse time timer reaches a preselected time period. Operation of the reconfiguration control mechanism is controlled by a reconfiguration management mechanism.
    • 在具有串联连接到双环传输线的配置控制单元的环形LAN系统中,配置控制单元设置有传输线路重新配置控制机制,用于在检测到传输故障时断开故障点,例如断开一个 的双绞电缆,恢复故障后,重新连接断开点,将传输线恢复到原来的状态。 如果重新配置操作计数器在由重新配置操作监视定时器测量的预定时间段内计数超过预定数量的重新配置操作,例如当间歇性地发生临时故障时,重新配置控制机制暂停重新配置控制。 然而,这种重新配置控制暂停的操作在系统启动之后最初被暂停,例如当传输线信号被衰减并且出现为故障时,直到系统启动之后经过时间计时器到达预选时间段之后的经过时间为止。 重新配置控制机制的操作由重新配置管理机制控制。