Why in telecommunications negative values to measure TX or RX powers are valid?

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Hi,
why in TLC having negative TX values is valid? How can we transmit something if the transmission power is in the negative?
Why for at least in fiber optics the “no signal received” was established to be -40 dbm rather than 0?

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Anonymous 0 Comments

To add numbers to what others have said and make it more obvious that it isn’t negative power, -40 dBm is 0.1 microwatt. 0 dBm would be 1 milliwatt, 30 dBm is 1000 mW = 1 W.

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