System Time Clock

Subscriber Trunk Dialing

Abbreviation for statistical time-division multiplexing.

1. In a communications circuit, a condition in which some specified characteristic of a condition, such as a value, rate, periodicity, or amplitude, exhibits only negligible change over an arbitrarily long period.
2. In an electrical circuit, the condition that exists after all initial transients or fluctuating conditions have damped out, and all currents, voltages, or fields remain essentially constant,… (Read More →)

The value to which a throughput measurement converges, as the duration of the observation period increases with statistically constant load on the virtual connection. [After T1.504-1989]

A variety of encryption that completely hides text or graphics, usually unencrypted, within other text or graphics that are electronically transmitted.

An automatic dial telephone system in which calls are switched by a succession of switches that move a step at a time, from stage to stage, each step being made in response to the dialing of a number.

An optical fiber with a core having a uniform refractive index.

For an optical fiber, a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core-cladding interface.
Note 1: The step-index profile corresponds to a power-law index profile with the profile parameter approaching infinity.
Note 2: The step-index profile is used in most single-mode fibers and some multimode fibers.

The metric unit of solid angle. See International System of Units.