This OID stores the transmit power in standard decibel-milliwatt (dBm) format as a text string, with a typical range of -40 to +8.2 dBm for comparison purposes. Network engineers prefer this version because dBm is the standard industry unit for optical power, making it easier to read and compare against specification sheets without manual conversion. An example value of '-3.5 dBm' immediately tells you the transmitter is operating at about one-quarter of its maximum power output.