Set E 1msec 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 1msec packet inter-arrival time.
Although explicitly setting the line speed in the 10Mbit/sec tests improved time stamp accuracy, this was not the case for the 100Mbit/sec tests due to outliers.
Figure 38: Automatic 10Mbit/sec Figure 39: Explicit 10Mbit/sec Figure 40: Automatic 100Mbit/sec Figure 41: Explicit 100Mbit/sec
We can see from Tables 37 to 40 that explicitly setting the line speed with a packet transmission inter-packet gap of 1msec did not improve time stamp accuracy for the 100Mbit/sec test. This was mainly due to two time stamp outliers.
Table 37: Automatic 10Mbit/sec (usec)
Mean Variance Standard Deviation 1083.294 1.097 1.047
Table 38: Explicit 10Mbit/sec (usec)
Mean Variance Standard Deviation 1083.294 1.022 1.011
Table 39: Automatic 100Mbit/sec (usec)
Mean Variance Standard Deviation 1008.408 0.943 0.971
Table 40: Explicit 100Mbit/sec (usec)
Mean Variance Standard Deviation 1008.407 1.029 1.015
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