Propagation Speed and Delay
Optical cables transfer data at the speed of light in glass (slower than vacuum). This is typically around 180,000 to 200,000 km/s, resulting in 5.0 to 5.5 microseconds of latency per km. Thus the round-trip delay time for 1000 km is around 11 ms.
Read more about this topic: Optical Fiber Cable
Famous quotes containing the words speed and/or delay:
“There was such speed in her little body,
And such lightness in her footfall,
It is no wonder her brown study
Astonishes us all.”
—John Crowe Ransom (1888–1974)
“Hatred and vengeance, my eternal portion,
Scarce can endure delay of execution:—
Wait, with impatient readiness, to seize my
Soul in a moment.”
—William Cowper (1731–1800)