The Proactive Network Maintenance Comeback (2024)

By Larry Wolcott Engineering Fellow Comcast Corporation Jason Rupe Principal Architect CableLabs Tom Kolze R & D Advanced Technology Development Engineer Broadcom Alexander (Shony) Podarevsky Architect and Technical Leader Promptlink Communications, Inc Mike Spaulding Vice President, Plant Maintenance Comcast Corporation

Proactive network maintenance (PNM) has been a cornerstone in detecting and locating faults in cable and plant infrastructure since 2009. Despite its long history, the deployment of downstream (DS) orthogonal frequency-division multiplexing (OFDM) and upstream (US) orthogonal frequency-division multiple access (OFDMA) technologies bring revolutionary enhancements over legacy single carrier quadrature amplitude modulation (SC-QAM) channels which use 24-tap pre-equalizers (Pre-EQ) in the upstream. The introduction of 25 kilohertz (kHz) and 50 kHz subcarrier spacing, along with a significantly wider channel width and higher sample rates, dramatically improves resolution and sensitivity. This advancement enables the precise location of damaged cable faults to within just a few feet.

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