Ethernet over fiber
# Ethernet over fiber

Ethernet over fiber is a networking technology that delivers Ethernet bandwidth ranging up to 400 Gbit/s using optical fiber lines. Such wired transmission method extends connectivity over long distances and provides greater immunity from electromagnetic interference (EMI) since copper-based Ethernet connections are being limited by a maximum length of 100 meters and are easier to affect by surrounding EMI.

## Background

Ethernet over fiber has emerged as a preferred medium in situations that require long-distance communication and a high level of immunity from electromagnetic interference (EMI). With fiber-optic cables, data can be transmitted over much greater distances compared to copper-based Ethernet cable.

Ethernet over fiber-optic cable (10BASE-F Ethernet) has been a technology with specifications dating back to the early 1980s. Initially, fiber-optic cables were primarily used to connect repeaters when the distance between them exceeded the limitations of ThickNet cable. The initial specification, known as Fiber Optic Inter Repeater Link (FOIRL), outlined the process of linking two repeaters using fiber-optic cable, allowing for connections of up to 1,000 meters (3,280 feet) in length.

