As part of a broader organisational restructure, data networking research at Swinburne University of Technology has moved from the Centre for Advanced Internet Architecture (CAIA) to the Internet For Things (I4T) Research Lab.

Although CAIA no longer exists, this website reflects CAIA's activities and outputs between March 2002 and February 2017, and is being maintained as a service to the broader data networking research community.


Set C 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 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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