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2. 发明授权

US06580697B1 Advanced ethernet auto negotiation 失效
标题翻译：高级以太网自动协商
公开(公告)号：US06580697B1
公开(公告)日：2003-06-17
申请号：US09400424
申请日：1999-09-21
申请人： Steven Lyle Gardner , James Scott Hiscock , Michael Yuen
发明人： Steven Lyle Gardner , James Scott Hiscock , Michael Yuen
IPC分类号： H04L516
CPC分类号： H04L49/351 , H04L5/1446 , H04L12/40136 , H04L12/413 , H04L49/3054 , H04L49/55
摘要： A port on a network device engages in auto-negotiation on a network link during a first operational state to select a transmission mode, either half duplex or full duplex. If half duplex operation is selected, the port commences half duplex operation in a second operational state. During the second operational state, the link is monitored for an error condition indicating that another network device attached to the link may not be operating in a half duplex manner. This error condition includes the occurrence of excessive collisions or late collisions. When the error condition is detected, the port commences full duplex operation in a third operational state, based on the presumption that device at the other end of the link may be configured for fixed full duplex operation. If proper operation ensues, the port remains configured for full duplex transmission. Because the presumption may be incorrect, the link is monitored during the third operational state for a second error condition indicating that transmissions by the network device may be interfering with transmissions by the other network device. Examples of the second error condition include excessive frame check sequence errors and an excessive number of abnormally truncated messages. If such a second error condition occurs, the port is disabled in a fourth operational state and the condition is reported to higher-level operating software. Repeated attempts at normal operation may follow, with further monitoring that may result in shutting down the port if normal operation cannot be achieved.
摘要翻译：网络设备上的端口在第一操作状态期间在网络链路上进行自动协商，以选择半双工或全双工的传输模式。如果选择了半双工操作，则端口在第二操作状态下开始半双工操作。在第二操作状态期间，监视该链路的错误状况，指示连接到链路的另一网络设备可能不以半双工方式操作。该错误状况包括发生过度碰撞或后期碰撞。当检测到错误条件时，端口在第三操作状态下开始全双工操作，基于假设链路另一端的设备可以被配置为固定全双工操作。如果正确操作，端口仍然配置为全双工传输。因为推测可能不正确，所以在第三操作状态期间监视链路是否存在第二错误状态，指示网络设备的传输可能会干扰其他网络设备的传输。第二错误条件的示例包括过多的帧校验序列错误和过多的异常截断的消息。如果发生这样的第二个错误条件，则在第四个操作状态下禁用端口，并将该条件报告给较高级别的操作软件。如果正常操作无法实现，可能会出现重复的正常操作尝试，进一步监控可能导致关闭端口。

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