Hybrid Fibre-Coaxial (HFC) networks are in the best position to enable the future 10G networks, which are needed to support symmetrical services. Multiple technologies are available to augment the current capacities of HFC networks. Examples of these technologies are Full Duplex DOCSIS (FDX) and Extended Spectrum DOCSIS (XSD). This paper shows how these technologies are complementary in nature and explains how the XSD technology can use the same node technology and modem silicon chips that are currently being developed for FDX.
Multiple System Operators (MSOs) are beginning to understand the bandwidth capacity requirements that they will need to compete within the 2020 decade. According to some, these bandwidth capacities may require 10 Gbps symmetrical services (or higher) by 2030. Supporting these higher bandwidth capacities will likely require several phased evolutionary changes over the next ten years. These evolutionary changes may ultimately require operators to consider a blended use of both FDX and XSD technologies. This paper will explore the details associated with some of these changes.