This attribute indicates the measurement offset that the ONT should use in AGC. The attribute has a step size of 0.1 dB, represented as a signed integer. The theoretical nominal RF signal is 80 channels of NTSC video, each having a per-channel optical modulation index of 3.5%. An ONT presented with such a signal should produce its specified ou tput when this attribute is set to zero. If total optical power is used for AGC, this attribute provides the OMI offset for any NTSC carriers present from the theoretical 3.5% value. For example, if the actual signal uses an OMI of 7.0% per channel (3 dB higher), then the ONT should be given an AGC setting of 30 (coded 0x1E). If broadband RF power is used for AGC, this attribute provides the total power offset for any NTSC carriers present from the theoretical 80 channel value. For example, if an actual signal contains 40 NTSC channels (3 dB lower), then the ONT should be given an AGC setting of <0096>30 (coded 0xE2).