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 E 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.

When the fxp1 interface was physically removed from the PC, it can be seen in Figures 34 to 37 that time stamp accuracy was slightly improved by explicitly configuring the line speed.

Figure 34: Automatic 10Mbit/sec
Figure 35: Explicit 10Mbit/sec
Figure 36: Automatic 100Mbit/sec
Figure 37: Explicit 100Mbit/sec

The Tables below support the visual conclusion of improved time stamp accuracy upon explicit line speed configuration. This improvement is, however, only minimal.

Table 33: Automatic 10Mbit/sec (usec)

Mean
Variance
Standard Deviation
583.250
0.997
0.998

Table 34: Explicit 10Mbit/sec (usec)

Mean
Variance
Standard Deviation
583.251
0.928
0.963

Table 35: Automatic 100Mbit/sec (usec)

Mean
Variance
Standard Deviation
508.364
0.996
0.998

Table 36: Explicit 100Mbit/sec (usec)

Mean
Variance
Standard Deviation
508.364
0.954
0.977






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