Which technologies are defined in DOCSIS 4.0 for sustaining the HFC network infrastructure?

The correct choice highlights the advancements introduced by DOCSIS 4.0, specifically the technologies referred to as FDX (Full Duplex) and ESD (Extended Spectrum DOCSIS).

FDX allows for simultaneous upstream and downstream transmission over the same frequency spectrum, enhancing the efficiency of data transmission and significantly increasing the available bandwidth for HFC (Hybrid Fiber-Coaxial) networks. This capability is essential as service providers look to meet the growing demands for higher data rates and improved performance.

ESD enhances the existing DOCSIS architecture by supporting a broader frequency range, thereby maximizing the spectral efficiency and accommodating more data channels. This is particularly relevant in the context of achieving high-speed internet access and improving network performance in a landscape increasingly dependent on robust bandwidth.

In summary, FDX and ESD represent fundamental advancements for sustaining and evolving HFC network infrastructure under DOCSIS 4.0, making them critical components for future-proofing networks against increasing data demands.