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以太网

CSMA/CD(载波监听多路访问/冲突检测)是以太网(或IEEE802.3)采用的介质访问控制方式，如果不是这样就不是以太网(或IEEE802.3)；比如采用令牌调度方式，应是基于IEEE 802.4令牌总线网。

根据CSMA/CD(载波监听多路访问/冲突检测)机理，它不能满足工业网络通信的实时性和确定性要求。由于以太网与CSMA/CD具有对等的技术内涵，可以说以太网不是传统工业网络要求的实时性和确定性网络。

(3)传输效率：不同网络对报文长度有一个限制。在网络报文中，除了有效传输数据之外，还有一些作为同步、地址、校验等附加字段。有效数据字段与附加字段之比反映的网络有效数据传输的效率，或者说反映一次有效数据传输的代价。通常报文格式如下:

<报文格式>

传输效率=有效数据长/[全部附加字段长+有效数据长]

以太网全部附加字段长=26字节，***有效数据长=1500字节，最小有效数据长=1字节(小于46时填0)，***传输效率=1500/(1500+26)=98.3%，最小传输效率=1/(1+26+45)=1.39%。

现场总线PROFIBUS全部附加字段长=11字节***有效数据长=244字节最小有效数据长=1字节***传输效率=244/(244+11)=95.69%最小传输效率=1/(1+11)=8.33%