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1.发明授权Local area network with biasing arrangement for facilitating access contention between work stations connected to a common bus 失效具有偏置布置的局域网，用于促进连接到公共总线的工作站之间的访问争用
公开(公告)号：US4841295A
公开(公告)日：1989-06-20
申请号：US890260
申请日：1986-07-24
IPC分类号： G06F13/40 , G06F3/00 , G06F13/374 , H04L12/413
CPC分类号： H04L12/40032 , H04L12/4135
摘要： A local area data distribution system includes a plurality of data processing stations connected to a common bus. Individual data processing stations contend with each other for access to the bus while the bus is held at a predetermined and controlled but overridable logic state by applying their priority code bit by bit to the bus and comparing the logic state of the bus with the bit they are applying thereto. A biasing arrangement holds the bus at the predetermined and controlled logic state during the contention interval at a signal level that may be easily overridden by an output of any one of the individual data processing stations.
摘要翻译： 局域数据分配系统包括连接到公共总线的多个数据处理站。 当总线通过将总线的位优先级逐位地应用到总线并将总线的逻辑状态与它们的位相比较时，各个数据处理站相互对抗以访问总线，同时总线被保持在预定和受控但可覆盖的逻辑状态 正在申请。 偏置装置在争用间隔期间将总线保持在预定和受控的逻辑状态，信号电平可以容易地被单独数据处理站中的任一个的输出覆盖。
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公开(公告)号：US4787082A
公开(公告)日：1988-11-22
申请号：US890262
申请日：1986-07-24
摘要： In a local data distribution network configuration a plurality of bidirectional data distribution busses are each connected to a bus master control circuit at a terminal end of the bus. Connected to each of the data distribution busses are a plurality of passive outlets to which intelligent connectors or stations may be connected. Each station has a unique address and is utilized for individually coupling data processing devices to the bus. Grouped pluralities of the bus master control circuits are included within a bus termination hub facility. Data from any of the bus master control circuits may be transferred by the bus termination hub via a data trunk as part of a star type configuration, to a central switching circuit such as a virtual circuit switch. Direction of data flow on each of the bidirectional busses and periodic temporary synchronization of the stations is controlled in response to signals transmitted to the bus by the bus master control circuitry associated with that bus. A bus termination hub switching facility cooperates with the included group of bus master control circuits to interconnect data processing stations on the various busses with the virtual circuit switch via the trunk line and with each other.The bus termination hub facility further includes bus monitoring, status polling and maintenance facilities. A faulty bus will be disconnected if a fault is discovered during monitoring intervals. It will remain disconnected until the fault is corrected.
摘要翻译： 在本地数据分配网络配置中，多个双向数据分配总线各自连接到总线终端处的总线主控制电路。 连接到每个数据分发总线的是多个可以连接智能连接器或站的被动出口。 每个站具有唯一的地址，并用于将数据处理设备单独耦合到总线。 总线主控制电路的分组多个被包括在总线终端集线器设备内。 来自任何总线主控制电路的数据可以由总线终端集线器经由作为星型配置的一部分的数据中继线传送到诸如虚拟电路交换机的中央交换电路。 响应于与总线相关联的总线主控制电路发送到总线的信号，来控制各个双向总线上的数据流的方向和站的周期性暂时同步。 总线终端集线器交换设备与所包括的总线主控制电路组合配合，以便通过主干线和彼此将各种总线上的数据处理站与虚拟电路交换机互连。 巴士终点枢纽设施还包括巴士监控，状态查询和维护设施。 如果在监控期间发现故障，故障总线将断开。 它将保持断开，直到故障得到纠正。
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