Line cards in the nature of telecommunications networking plug-in cards, namely, optoelectronic circuit boards that interface with telecommunications access networks, for installation into optical telecommunications equipment associated with an optical network for the purpose of enabling communication of data over the optical network and managing the optical telecommunication equipment; optical fiber telecommunications apparatus; fiber-optic transmission systems, namely fiber-optic transmitters, receivers and transceivers for transmission of video signals, audio signals and data via optical fibers.