How Does Full Duplex DOCSIS 3.1 Works?
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-- CableLabs. Published on Oct 24, 2017. What is Full Duplex DOCSIS 3.1? Retrieved from • What is Full Duplex DOCSIS® Technolog...
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HIGHER BANDWIDTH
Data started off with a shared 2.5 Mbps upstream channel. That later grew to 10 Mbps with DOCSIS 1.0 and to 30 Mbps with DOCSIS 2.0. The number of channels that the silicon could support also grew from one to four. Today with bonding and DOCSIS 3.0, the return path data capacity is around 90 Mbps in a 42 MHz or 65 MHz return path. In practice, the spectrum below 42 MHz is full of legacy traffic and will likely stay as ATDMA traffic.
Although the OFDMA traffic from DOCSIS 3.1 could theoretically be mixed with the ATDMA traffic, the bandwidth gain provided by OFDMA and LDPC would be quickly offset by the time and frequency guard time requirements that must exist between DOCSIS 3.0 and DOCSIS 3.1 spectrum. With DOCSIS 3.0 and DOCSIS 3.1, it is possible to run a higher frequency upstream return path. The two favorite options are 85 MHz and 204 MHz. Both these return paths push the start of the downstream spectrum to a higher frequency. In todays FDD (Frequency Division Duplex) system, new upstream spectrum is taken from existing downstream spectrum.
INDUSTRY ADAPTATION
The Cable Industry is now a recognized leader in the delivery of Last-Mile Services to residential subscribers, and it is continually expanding its access to business subscribers. The offered services include Video, Voice, and Broadband Data services. While the Cable network started out as a simple coaxial infrastructure optimized for the delivery of Analog Video, it has evolved into a powerful Hybrid Fiber-Coaxial (HFC) system over the years to support these many varied service types.
The HFC network has proven time and time again that it is an extremely flexible and robust infrastructure that can be morphed to accommodate the unique and continually changing needs of the subscribers and the different services.
The addition of amplifiers for longer reach was the beginning of this evolution. That was followed by spectral expansions to deliver more TV channels. Then by the addition of fiber to further increase reach and reduce the effects of electrical interference.
The addition of DOCSIS for Voice and Broadband service was another powerful modification. Fiber Deep solutions (based on continual node-splits) have carried the network to its current state of existence. DOCSIS 3.1 augmentations will expand the spectrum and the spectral efficiency of the HFC network to support ~10 Gbps Downstream bandwidth capacity and ~2 Gbps Upstream bandwidth capacity on a 1.2 GHz plant with a 204 MHz high-split.
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