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In telecommunication, the term loading has the following meanings:

1. The insertion of impedance into a circuit to change the characteristics of the circuit.

2. In multichannel communications systems, the insertion of white noise or equivalent dummy traffic at a specified level to simulate system traffic and thus enable analysis of system performance.

3. In telephone systems, the load, i.e. , power level, imposed by the busy hour traffic.

Note 1: The loading may be expressed as (a) the equivalent mean power and the peak power as a function of the number of voice channels or (b) the equivalent power of a multichannel complex or signal composite referred to zero transmission level point (0TLP).

Note 2: Loading is a function of the number of channels and the specified voice channel mean power.

Source: from Federal Standard 1037C and from MIL-STD-188