In a telecommunications
system, a
test point, i.e., a point where a
signal may be inserted or measured, and for which the nominal
power of a test signal is specified. (
188 ) Note 1: 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. Note 2: The nominal
transmission level at a specified TLP is a function of system design and is an expression of the design
gain or
loss. Note 3: Voice-
channel transmission levels, i.e., TLPs, are usually specified for a
frequency of approximately 1000 Hz. Note 4: The TLP at a point at which an
end instrument, e.g., a
telephone set, is connected is usually specified as 0
dBm.