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:
“Wait, Kate! You skate at such a rate
You leave behind your skating mate.
Your splendid speed won’t you abate?
He’s lagging far behind you, Kate.”
—David Daiches (b. 1912)
“Keep on adding, keep on walking, keep on progressing: do not delay on the road, do not go back, do not deviate.”
—St. Augustine (354–430)