1. The minimum value of a signal that can be detected by the system or sensor under consideration.
2. A value used to denote predetermined levels, such as those pertaining to volume of message storage, i.e., in-transit storage or queue storage, used in a message switching center.
3. The minimum value of the parameter used to activate a device.
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In a laser, the driving current corresponding to lasing threshold.

See FM threshold extension.

In opto-electronics, the frequency of incident radiant energy below which there is no photo-emissive effect.

A group of 12 voice-frequency channels transmitted as a unit through a carrier system.

An aggregate of 60 voice-frequency channels, i.e., five groups, transmitted as a unit through a carrier system.

In carrier telephone transmission, equipment that accepts the signal from a group receiver output and attenuates it to the proper signal level for insertion, without frequency translation, at the input of a group transmitter.

In carrier telephone transmission, equipment that accepts the multiplexed signal from a supergroup receiver output, amplifies it without frequency translation, and provides the proper signal level to the input of a supergroup transmitter equipment.

1. The number of bits, characters, or blocks passing through a data communication system, or portion of that system.
Note 1: Throughput may vary greatly from its theoretical maximum.
Note 2: Throughput is expressed in data units per period of time; e.g., in the DDN, as blocks per second.
2. The maximum capacity of a communications channel or system.
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Abbreviation for terahertz. See electromagnetic spectrum.