In a telecommunications system, a transmission level point (TLP) is a test point or interface, i.e. a physical point in an electronic circuit where a test signal may be inserted or measured, and for which the nominal power of the test signal is specified.
A zero dBm transmission level point (or synonym zero transmission level point) is a transmission level point where the nominal test signal power is 0dBm.
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.
The nominal transmission level at a specified TLP is a function of system design and is an expression of the design gain or loss.
Voice-channel transmission levels, i.e. TLPs, are usually specified for a frequency of approximately 1,000 Hz.
The TLP at a point at which an end instrument, e.g. a telephone set, is connected is usually specified as 0 dBm.
Famous quotes containing the words level and/or point:
“Success four flights Thursday morning all against twenty one mile wind started from Level with engine power alone speed through air thirty one miles longest 57 second inform Press home Christmas.”
—Orville Wright (1871–1948)
“The point is, that the function of the novel seems to be changing; it has become an outpost of journalism; we read novels for information about areas of life we don’t know—Nigeria, South Africa, the American army, a coal-mining village, coteries in Chelsea, etc. We read to find out what is going on. One novel in five hundred or a thousand has the quality a novel should have to make it a novel—the quality of philosophy.”
—Doris Lessing (b. 1919)