1. In telephone systems, a switching system in which telephone operators receive call instructions orally from users and complete them by automatic equipment.
2. At tape-relay intermediate stations, the manual routing or rerouting of taped messages without rekeying them.

Synonym injection laser diode.

1. A method which is simplex operation at one end of the circuit and duplex operation at the other. RR Footnote: In general, duplex operation and semiduplex operation require two frequencies in radiocommunication; simplex operation may use either one or two. [NTIA] [RR]
2. Operation of a communications network in which a base station operates in a duplex mode with… (Read More →)

See sending loudness rating. [T1.508-1998]

A device that accepts address information from a register or routing information from a translator, and then transmits the proper routing information to a trunk or to local equipment.
Note: Sender and register functions are often combined in a single unit.

The ratio in dB of the sound pressure produced by a speaker to the voltage produced by a telephone and loop as defined by ITU-T Recommendation P.7
9. [T1.255-1997]

In teletypewriter (TTY) systems, interference, in a given channel, caused by transmissions from one or more adjacent TTY channels transmitting from the end at which the crossfire, i.e., interference, is measured.

1. Information, the loss, misuse, or unauthorized access to or modification of, which could adversely affect the national interest or the conduct of federal programs, or the privacy to which individuals are entitled under 5 U. S. C. Section 552a (the Privacy Act), but that has not been specifically authorized under criteria established by an Executive Order or an Act… (Read More →)

1. In an electronic device, e.g., a communications system receiver, or detection device, e.g., PIN diode, the minimum input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria.
Note 1: The signal input may be expressed as power in dBm or as field strength in microvolts per meter, with input network impedance… (Read More →)

1. Information representing elements of the security label(s) of a subject and an object. Sensitivity labels are used by the trusted computing base (TCB) as the basis for mandatory access control decisions. [INFOSEC-99]
2. A piece of information that represents the security level of an object and that describes the sensitivity (e.g., classification) of the data in the object. Sensitivity… (Read More →)