The latency floor

Light 04

Estimate

Sydney is 17,000 km from London. The board has a perfect fiber pair on the great circle: no detours, no routers, no queues. Light in glass has a group index of 1.468. How many ms does one 64-byte round trip take? No protocol can beat this time.

10 µs100 µs1 ms10 ms100 ms1 s10 s100 s

Type a number or drag the scale. Each mark is 10 times the mark before it.

Light across a planetDrag or use arrow keys to pick a path