nbsSffDiagsPowerMeasurementType 1.3.6.1.4.1.629.204.1.3.1.1.8

Byte 92, bit 3 indicates whether the received power measurement represents average input optical power or OMA. If the bit is set, average power is monitored. If it is not, OMA is monitored. For XFPs, the address location would be byte 220, bit 3