What is cable and HFC?
Cable is a system originally designed for delivering television content to consumers via radio frequency (RF) signals transmitted through coaxial cables.
Originally known as Community Antenna Television (CATV), modern cable systems today provide broadband internet and telephony as well as video services.
The majority of today’s systems use hybrid fibre-coaxial (HFC) distribution. This means the trunklines that carry the signal from the headend to local neighborhoods are optical fibre to provide greater bandwidth and also extra capacity for future expansion. At the headend, the radio frequency electrical signal carrying all the channels is modulated on a light beam and sent through the fibre. The fibre trunkline goes to several distribution hubs, from which multiple fibres fan out to carry the signal to boxes called optical nodes in local communities. At the optical node, the light beam from the fibre is translated back to an electrical signal and carried by coaxial cable to customers.