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?
In: 0
It’s because you’re using decibels. Decibels measure how strong or weak something is relative to something else. Because it’s a relative measurement, negative values are allowed. Negatives mean less than (in this case weaker than) not non existent. So -40 db is a measure how how much weaker the signal can be (probably compared to noise), it’s putting a limit on how weak the signal can be relative to another thing (not 100% sure but probably noise).
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