Status in source: current.
Technical details
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"\"DOCSIS 3.1 CCAP Operations Support System Interface Specification, CM-SP-CCAP-OSSIv3.1, PNM section.\"",
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"The purpose of the upstream channel power metric is to provide an estimate of the total received power in a specified OFDMA channel at the F connector input of the CMTS line card for a given user. The measurement is based on upstream probes, which are typically the same probes used for pre-equalization adjustment. The CMTS measures the total power of the probe subcarriers received from the CM. For channels without boosted pilots, the CCAP calculates the average power per subcarrier (Paverage) and then calculates the power normalized to 1.6 MHz as a)Paverage + 10 * log10(32) for 50 kHz subcarrier spacing, or as b)Paverage + 10 *log10(64) for 25 kHz subcarrier spacing. For channels with boosted pilots, the CCAP calculates the average power per subcarrier (Paverage) and then calculates the power normalized to 1.6 MHz as a)Paverage + 10 * log10(32) + 1 dB for 50 kHz subcarrier spacing, or as b)Paverage + 10 *log10(64) + 0.5 dB for 25 kHz subcarrier spacing. NOTE: The CMTS would also use that adjusted value for comparison with the Target Receive Power for the purposes of transmit power adjustments in the RNG-RSP."
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