A tone sent at a predetermined level and frequency through a transmission system for test purposes, such as for facilitating measurements and for aligning gains and losses in the system.

The contact person who coordinates the updating and distribution of testline information for their company and is responsible for providing testline information to the industry.

Synonym word processing.

The authoritative source of text enablement and routing information for all multimedia services associated with Toll-Free Numbers.

Task Force

Trivial File Transfer Protocol

Abbreviation for telegraph. See telegraphy.

Abbreviation for trunk group multiplexer.

Abbreviation for total harmonic distortion.

The noise generated by thermal agitation of electrons in a conductor. The noise power, P, in watts, is given by P = kTf, where k is Boltzmann's constant in joules per kelvin, T is the conductor temperature in kelvins, and f is the bandwidth in hertz.
Note 1: Thermal noise power, per hertz, is equal throughout the frequency spectrum, depending… (Read More →)