Link segments are pure point-to-point connections of two repeaters or a remote repeater that are not available for connecting
, a distance of 1,000 m is specified. Typically, optical fib ers are used to implement link segments (FOIRL), but they can also be implemented in coaxial cables. They consist of two optical fibers; one fiber is provided for each transmitting direction. The maximum propagation delay on an 802.3 link segment (1,000 m) must not exceed 2,570 ns.