Critical device with increased availability
    2.
    发明公开
    Critical device with increased availability 有权
    Kritische Vorrichtung miterhöhterVerfügbarkeit

    公开(公告)号:EP2090950A1

    公开(公告)日:2009-08-19

    申请号:EP08151548.8

    申请日:2008-02-18

    申请人: ABB Research Ltd.

    摘要: The present invention is concerned with increasing availability of critical devices (10) in redundant communication networks of a communication system. To ensure higher availability, the critical device is provided with a Link Redundancy Entity (LRE) (11) which can act as a switch when the critical device is part of the last communication link between two switches (2, 3) of the communication network. When the critical device is not a part of the last communication link, the LRE defines one port (13a) of the critical device to be the "root" port and the other port (13b) to be the "alternate" port. When the critical device works according to Parallel Redundancy Protocol (PRP), the LRE is adapted to send identical frames on two redundant communication links of the network and also to determine whether the received data frame is a singular frame or a first frame of a pair of frames.

    摘要翻译: 本发明涉及在通信系统的冗余通信网络中增加关键设备(10)的可用性。 为了确保更高的可用性,关键设备提供有链路冗余实体(LRE)(11),其可以在关键设备是通信网络的两个交换机(2,3)之间的最后一个通信链路的一部分时充当交换机 。 当关键设备不是最后一个通信链路的一部分时,LRE将关键设备的一个端口(13a)定义为“根”端口,将另一个端口(13b)定义为“备用”端口。 当关键设备根据并行冗余协议(PRP)工作时,LRE适于在网络的两个冗余通信链路上发送相同的帧,并且还确定接收的数据帧是单个帧还是第一帧 的框架。