Experimental Research about the Impact of IEEE 802.1P on Real-Time Behavior of Switched Industrial Ethernet

Based on the test bed which had already been built, a series of practical experiments have been carried out to study the impact of IEEE 802.1P on real-time behavior of switched industrial Ethernet. Comparing the experimental results with the theoretical analysis, we can find the deficiency of theoretical analysis and then perfect them. The experiments also show many problems would be happen, when IEEE 802.1P is applied to the switched industrial Ethernet. The main potential problem is the interference between the different priority levels message. Abnormity processing would happen when the port is overloading and lower priority packets blocks higher priority packets delivery. Accordingly the experiments would direct the theoretical analysis and practical improvement of industrial Ethernet.