L5 system: Overall description and system design

The L5 Coaxial-Carrier Transmission System is a new solid-state broadband system designed to transmit 10,800 long-haul message channels on standard 1-inch (9.5-mm) coaxial cable. Alternatively, high-speed digital signals may be transmitted in selected master groups. This paper contains an overall system description and describes in detail system design considerations such as the transmission plan, frequency allocation, and 4000-mile noise performance. Also considered are the significant properties of the coaxial medium, the ways they affect the hierarchy of equalizers traditionally found in long-haul coaxial systems, and the manner in which the several levels of equalization relate to each other and to the fundamental transmission phenomena within the system.