This attribute corresponds to the center frequency of the 6 MHz band where the CM measured the average channel power. The 6 MHz measurement band is defined as any 6 MHz band with a center frequency of 111 + 6 (n-1) MHz for n = 1,2...281 (i.e., 111,117,...1791 MHz). The CM provides the center frequency for the 6 MHz channel, other than the one encompassing the PLC channel, per the following formula: centerfreq = 111 + 6(n-1) such that (centerfreq - 111) / 6, is a whole number. If the CM is reporting the frequency of the PLC, using a BandIndex of 0, the CM provides the center frequency of the lowest subcarrier of the 6 MHz encompassed spectrum containing the PLC at its center. The downstream OFDM channel center frequency range depends on the mode of operation to which DOCSIS equipment is configured to operate. Refer to [PHYv3.1] Downstream CM Spectrum section, for the downstream OFDM boundary frequency limits when equipment is configured to be compliant with the DOCSIS 3.1 and (non-FDX and non-FDD extended spectrum) DOCSIS 4.0 frequency plans. Refer to [PHYv4.0] Downstream FDX CM Spectrum section for the downstream OFDM boundary frequency limits when equipment is configured to be compliant with FDX mode. Refer to [PHYv4.0] Upstream and Downstream Frequency Plan for FDD Operation section for the downstream OFDM boundary frequency limits when the equipment is configured to be compliant with FDD mode.