Generally accepted standards determine that the maximum transmission distances for Gigabit Ethernet over multimode fibre are: However, recent developments in laser technology have now enabled transmission distances of 2000 metres for both fibre types by the use of specific optical devices.
No! While transmission may be maintained through a 50/125 to 62.5/125 interface, the mismatch in fibre core sizes produces significant attenuation which will precipitate failure of the network over a period of time.
OM3 is a “laser optimised” 50/125 multimode fibre for high bandwidth applications.