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Set A 50msec Packet Inter-Arrival Time
The following section discusses the difference between automatically allowing the interface to detect the line speed and explicitly setting the line speed of an interface for 50msec packet inter-arrival time for Set A.
An error in one time stamp causes consecutive inter-packet intervals to be skewed equally in opposite directions about the mean. This leads to the symmetric patterns in Figures 14 and 16 when the receiving interface is configured to automatically detect line speed. These patterns were not was obvious in the 125usec, 500usec and 1msec inter-arrival time results.
Figure 14: Automatic 10Mbit/sec Figure 15: Explicit 10Mbit/sec Figure 16: Automatic 100Mbit/sec Figure 17: Explicit 100Mbit/sec
Tables 13, 14, 15 and 16 once again show that explicitly setting the line speed on the interface causes the variance and standard deviation to be smaller.
Table 13: Automatic 10Mbit/sec (usec)
Mean Varience Standard Deviation 50083.73 74232.98 272.46
Table 14: Explicit 10Mbit/sec (usec)
Mean Varience Standard Deviation 50083.72 1.92 1.38
Table 15: Automatic 100Mbit/sec (usec)
Mean Varience Standard Deviation 50008.86 80132.26 283.08
Table 16: Explicit 100Mbit/sec (usec)
Mean Varience Standard Deviation 50008.87 1.75 1.32
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