Data Collection Best Practices Time Skew

When calculating the delta time between two polling requests, use sysUpTime from the device itself and not the management station to avoid transit time skew.

time

Poll t=1

Transit tx time = 5 ms

Transit rx time = 3 ms

Total = 8ms

Transit time = 2 ms

Transit time = 1 ms

Total = 3ms

Poll t=2

Skew = 5ms

When calculating the delta time between two polling requests, use sysUpTime from the device itself and not the management station to avoid transit time skew.