Hybrid-fiber coaxial (HFC) networks are at capacity, for both bandwidth and hardware requirements. Greater speeds and capabilities are being demanded by customers, To date, customers have employed node splits and improved DOCSIS 3.1 features to address these issues. These methods are no longer sufficient, and there is a need to reduce Service Group size to create nodes with fewer customers and higher data speeds.
This has led to using Distributed Access Architecture (DAA), specifically Remote-PHY Devices (RPD/R-PHY). This introduces a digital Ethernet connection between a node and a headend, which allows operators to achieve higher modulation levels and improved SNR. It also reduces power and cooling requirements. However, there are challenges with respect to disruption of plant maintenance. There are no RF test points in the hub, which means there is nothing to feed return path monitoring sweep systems. This means that traditional alignment and maintenance operations can't be performed in R-PHY architecture. Also, if both Centralized Access Architecture (CAA) and DAA are operating simultaneously, multiple vendors must be supported for both monitoring and troubleshooting. DAA also requires new tools and monitoring/troubleshooting procedures.
The Upstream Spectrum Analyzer was created to address these issues. Its capture modes include measurement of white noise, ingress noise, and impulse noise. It's a virtualized application that requires no hardware probes. It integrates the Spectrum Analyzer with Alarm Central to provide context through alarms, which improves troubleshooting and reduces Mean Time to Repair (MTTR). Spectrum analysis can also be accessed through mobile devices in the field, such as a tablet.