Standard telegraph level
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In telecommunication, standard telegraph level ( STL ) is the power per individual telegraph channel required to yield the standard composite data level.
Note: For example, for a composite data level of -13 dBm at 0-dBm transmission level point (0TLP), the STL would be approximately -25 dBm for a 16-channel VFCT terminal computed from STL = - (13+10log10 n ), where n is the number of telegraph channels and the STL is in dBm.
Source: from Federal Standard 1037C and from MIL-STD-188