- Transmission level point
In a telecommunications
system, a transmission level point (TLP) (or Zero dBm transmission level point) is a test point, "i.e." a physical point in an electronic circuitwhere a signal may be inserted or measured, and for which the nominal power of a test signal is specified.
In practice, the abbreviation TLP is usually used, and it is modified by the nominal level for the point in question. For example, where the nominal level is 0
dBm, the expression 0 dBm TLP, or simply, 0TLP, is used. Where the nominal level is −16 dBm, the expression −16 dBm TLP, or −16TLP, is used.
transmission levelat a specified TLP is a function of system design and is an expression of the design gainor loss.
Voice-channel transmission levels, i.e TLPs, are usually specified for a
frequencyof approximately 1,000 Hz.
The TLP at a point at which an
end instrument, e.g. a telephoneset, is connected is usually specified as 0 dBm.
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