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1. 发明申请

US20150293871A1 REDUNDANT PACKET FORWARDING SYSTEM 有权
标题翻译：冗余分组前向系统
公开(公告)号：US20150293871A1
公开(公告)日：2015-10-15
申请号：US14441188
申请日：2012-11-27
申请人： HEZI RAHAMIM , AMIR YOSHA
发明人： HEZI RAHAMIM , AMIR YOSHA
IPC分类号： G06F13/40 , G06F13/24 , G06F13/42
CPC分类号： G06F13/4022 , G06F13/24 , G06F13/4221 , H04L12/437 , H04L69/40
摘要： A master device has a slave port and a redundant slave port for communicating with slaves according to a network protocol, e.g. EtherCAT, via data packets including a circulating bit. The slaves are arranged in a sequence starting at the slave port, and are connected via a communication medium. A respective slave in the sequence detects whether the connection to its processing receiver is lost, and, if so, internally transfers any data packets from its forwarding arrangement to its processing arrangement, while setting the circulating bit. The master device has a switcher unit coupled to the redundant slave port and a last slave in the sequence. The switcher unit transfers data packets from the switcher receiver to the switcher transmitter, and detects whether a circulating bit is set. If so, the unit switches off said transferring and switches on a connection between the redundant slave port and the switcher for transferring replicated packets to the sequence. Advantageously, the system enables hot plug-in and also distributed clock synchronization, and reduces the processing requirements of the master device.
摘要翻译：主设备具有从端口和冗余从端口，用于根据网络协议与从设备进行通信。 EtherCAT，通过包括循环位的数据包。从器件从从端口开始按顺序排列，并通过通信介质连接。序列中的相应从属装置检测与其处理接收器的连接是否丢失，如果是，则将设置循环位的内部将其转发装置的数据包内部传送到其处理装置。主设备具有连接到冗余从站端口的切换单元和序列中的最后一个从站。切换单元将数据包从切换台接收机传送到切换台发送器，并检测循环位是否被设置。如果是，则单元关闭所述传输并切换冗余从端口和切换器之间的连接，以将复制分组传送到序列。有利的是，该系统实现了热插拔和分布式时钟同步，并且降低了主设备的处理需求。

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