Centre closure

Set B 500usec Packet Inter-Arrival Time

The following section shows the difference between automatically allowing the interface to detect the line speed and explicitly setting the line speed of an interface for 500usec packet inter-arrival time.

The following Figures show that for both the 10Mbit/sec and 100Mbit/sec settings, explicity setting the line speed caused the time stamp values to be slightly more consistent than when allowing the interface to detect the line speed. Note, however, that outliers occured for both the automatic and explicit line speed configurations.

Figure 10: Automatic 10Mbit/sec	Figure 11: Explicit 10Mbit/sec
Figure 12: Automatic 100Mbit/sec	Figure 13: Explicit 100Mbit/sec

Tables 9 to 12 correspond to Figures 10 to 13 and show the slight improvement in variance and standard deviation when the line speed was explicitly set due to the reduction in number of time stamp outliers.

Table 9: Automatic 10Mbit/sec (usec)

Mean	Variance	Standard Deviation
583.251	1.377	1.174

Table 10: Explicit 10Mbit/sec (usec)

Mean	Variance	Standard Deviation
583.251	1.157	1.076

Table 11: Automatic 100Mbit/sec (usec)

Mean	Variance	Standard Deviation
508.364	1.649	1.284

Table 12: Explicit 100Mbit/sec (usec)

Mean	Variance	Standard Deviation
508.364	1.305	1.142

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