In other words, radio signals are carried over fiber-optic cable.

These devices employ a variety of transmission technologies and physical media (wireless, copper wire, fiber-optic cable, coaxial cable).

Their business-class service also provides direct fiber-optic cable services via leased data circuits for larger companies.

A fiber-optic cable comprises multiple pairs of fibers.

These pathways, called communication channels, use two types of media: cable (twisted-pair wire, cable, and fiber-optic cable) and broadcast (microwave, satellite, radio, and infrared).