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2. 发明授权

US06665275B1 Network device including automatic detection of duplex mismatch 失效
标题翻译：网络设备包括自动检测双工不匹配
公开(公告)号：US06665275B1
公开(公告)日：2003-12-16
申请号：US09453720
申请日：1999-12-03
申请人： Andrew M Davy , Andrew P White , David E Bill , David Kirby , Stephen N Crocombe
发明人： Andrew M Davy , Andrew P White , David E Bill , David Kirby , Stephen N Crocombe
IPC分类号： H04B144
CPC分类号： H04L12/40136 , H04L12/40032 , H04L12/413 , H04L29/06 , H04L69/24
摘要： A network device which is for use in an Ethernet packet-based communication system has at least one port which is capable of auto-negotiation to select between half duplex and full duplex working on a link to which the port is connected. The device includes means for monitoring the existence of late collisions between packets on said link, means for monitoring the existence of packet fragments on the link, and monitoring means for detecting and correcting for a duplex mismatch on the link partner. This monitoring means is operative to determine whether there are any late collisions and in the absence of a detection of fragments to configure the port from a half duplex mode to a full duplex mode. The monitoring means is also operative to detect the presence of fragments when the port is in full duplex mode and thereby to provide an indication that a rule relating to network size is infringed.
摘要翻译：用于基于以太网分组的通信系统中的网络设备具有至少一个端口，能够自动协商在端口连接的链路上工作的半双工和全双工之间进行选择。该装置包括用于监视所述链路上的分组之间的后期冲突的存在的装置，用于监视链路上的分组片段的存在的装置以及用于检测和校正链路伙伴上的双工不匹配的监视装置。该监视装置用于确定是否存在任何延迟的冲突，并且没有检测到将端口从半双工模式配置为全双工模式的分段。当端口处于全双工模式时，监视装置还可操作以检测碎片的存在，从而提供与网络大小相关的规则被侵犯的指示。

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