分析了CAN总线标准的网络拓扑结构、报文帧格式，并对标准帧和扩展帧进行了比较。
This paper analyzed topology and message frame types of CAN bus and compared the standard frame format and extended frame format.
在分析数字化变电站网络结构的基础上，提出选用支持组播协议的交换机，以免组播报文以广播方式发送。
Based on the structural analysis of digital substation network, the switch which supports the multicast protocol is proposed to avoid the broadcast transmission for multicast packets.
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