CableLabs has embarked on a new development effort to craft a “full duplex” use of hybrid fiber coax networks that breaks significantly with the traditional frequency division method used to support high speed access on cable TV networks, where one set of frequencies is reserved for upstream, and a different set of frequencies for upstream communications.
In full duplex communication, the upstream and downstream traffic use the same spectrum at the same time, roughly doubling efficiency, CableLabs says
A DOCSIS 3.1 full duplex network provides the peak speeds and flexibility of time division duplex solutions, but outperforms both time division and frequency division multiplexing in terms of bandwidth efficiency.
Full duplex will help evolve cable-provided high speed Internet access to support symmetric multi-gigabit service up to 10 Gbps on 1-GHz HFC networks, with the potential for even higher performance by utilizing spectrum that is currently available for future expansion above 1 GHz.
Today’s Technology Duplex: Time Division Duplex
Today’s Technology Duplex: Frequency Division Duplex
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