Which two features in DOCSIS 3.1 help extend the lifespan of HFC networks?

The features that extend the lifespan of HFC (Hybrid Fiber-Coaxial) networks in DOCSIS 3.1 are Orthogonal Frequency Division Multiplexing (OFDM) and Low-Density Parity-Check (LDPC) codes.

OFDM significantly enhances the efficiency of the available frequency spectrum, allowing for higher data throughput and improved performance. By breaking down a signal into multiple smaller sub-signals that are transmitted simultaneously over different frequencies, OFDM maximizes bandwidth and minimizes interference, which is especially beneficial in HFC networks that share bandwidth among multiple users.

LDPC codes are an advanced error correction method that improves data transmission reliability. They help ensure data integrity over the coaxial cable by detecting and correcting errors more effectively than previous methods. This enhanced error correction capability allows for more robust data transmission, even under conditions where signal quality might degrade, ultimately leading to a more reliable network and extending its service life.

Together, OFDM and LDPC contribute to the efficiency, reliability, and capacity of HFC networks, ensuring they can meet growing demand and operate effectively for many years.