The Future of HFC Networks

Upstream constraints have long been the Achilles' heel of Hybrid Fiber-Coaxial (HFC) networks. Increasingly, cable operators face the challenge of growing demand for cloud services, HD video uploads, real-time gaming, live streaming video and virtual or augmented reality. In this article, we propose a HFC network architecture and system concepts that remove the restrictions on asymmetry ratio, preparing HFC networks for the anticipated growth in demand for symmetrical services. We demonstrate that 10 Gb/s symmetrical data rates are feasible in conjuncture with the proposed network architecture with XG-Cable, a proof-of-concept technology that employs full duplex transmission through extremely wideband echo cancellation while eliminating the interference that once made full duplex impossible.. This proof of concept technology could be made compatible with legacy DOCSIS networks and validates CableLabs Full Duplex DOCSIS 3.1 proposal. The proposed network evolution provides a feasible intermediate stepping stone for Multi System Operators (MSOs) to transition their HFC plant to a Fiber-To-The-Home network.