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For a refractive index of 1.538 then the velocity of light in the fibre = 0.650138 * c = 194,906.469 km/sec or
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Alpha' = RTD[km] / (min_RTT[ms] * 97.453235 [km/sec])
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or Alpha' is roughly 2.6% > Alpha, and RTD' = Alpha' + RTT * 100 is roughly 2.6% > RTD.
Other causes for inaccuracies
- One likely cause for a large value of Alpha (>> 1) is that the min_RTT is "incorrect". For example the target host that is actually responding is not located at the specified lat/long. Often this is due to the target host being a proxy in an entirely different location.
- Another cause is that the lat/long for the target (or monitor) is inaccurate.