

Set C 500usec Packet InterArrival 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 interarrival time.
The following Figures show that explicity setting the line speed helped improve time stamp accuracy. We can see in Figures 18 to 21 that a small number of outliers occured in all tests.
Figure 18: Automatic 10Mbit/sec Figure 19: Explicit 10Mbit/sec Figure 20: Automatic 100Mbit/sec Figure 21: Explicit 100Mbit/sec
The Tables below confirm that configuring the receiving PC interface to automatically detect line speed slightly increased the variance and standard deviation due to more outliers occuring than when the line speed was explicitly set.
Table 17: Automatic 10Mbit/sec (usec)
Mean Variance Standard Deviation 583.251 1.738 1.318
Table 18: Explicit 10Mbit/sec (usec)
Mean Variance Standard Deviation 583.251 1.349 1.162
Table 19: Automatic 100Mbit/sec (usec)
Mean Variance Standard Deviation 508.364 1.602 1.266
Table 20: Explicit 100Mbit/sec (usec)
Mean Variance Standard Deviation 508.364 1.525 1.235
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Last Updated: Thursday 13May2004 09:55:36 AEST URL: Maintained by: Ana Pavlicic apavlicic@groupwise.swin.edu.au Authorised by: Grenville Armitage garmitage@swin.edu.au