We know that the PLC contains the information on how to decode the OFDM signal. Now that we know what building blocks make up OFDM, lets look at each one to see why it is important. Profiles beyond A, B, C, and D are up to the discretion of the CMTS and CM manufacturers, but there aren’t any limits to the amount of profiles that can be used.Įach of the building blocks mentioned make up a stack and each of the base building blocks must be working properly for the next building block to be used. Profiles B and above can be used to reach higher QAMs and more efficiency. Beyond Profile A are the higher order profiles – B, C, D, and more. This is the boot profile that every DOCSIS 3.1 modem must be able to use in order to reach higher QAMs with the other profiles. One level up is the next codeword pointer (NCP) that tells the modem which codewords are present and which profile to use on each codeword. At the base is the phy link channel (PLC) that contains information on how to decode the OFDM signal. To keep this from happening, let’s take a look at the building blocks that make up OFDM. The bad news is that certain precautions must be taken or else the new DOCSIS 3.1 cable modems will resort back to DOCSIS 3.0 without warning – losing all efficiencies. The good news is that very few plant upgrades need to be made to take advantage of the new version of DOCSIS. One of the interesting aspects of DOCSIS 3.1 is its backwards compatibility with DOCSIS 3.0. But what building blocks make up OFDM and why are they important? Orthogonal frequency domain multiplexing (OFDM) and the profiles it creates can boost the speed and throughput of DOCSIS 3.1 to levels that rival fiber.
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