An asynchronous terminal that (a) does not use a transmission control protocol and (b) sends or receives data sequentially one character at a time.
Note: Dumb terminals usually handle ASCII characters.

A dissipative impedance-matched network, usually used at the end of a transmission line to absorb all incident energy.
Note: The dummy load usually converts the incident energy to thermal energy.

A pseudobinary-coded signal in which a "0" ("zero") bit is represented by a zero-level electric current or voltage; a "1" ("one") bit is represented by a positive-level current or voltage if the quantity of "0" bits since the last "1" bit is even, and by a negative-level current or voltage if the quantity of "0" bits since the last "1"… (Read More →)

A fiber-optic cable that contains two optical fibers. [After FAA]

A circuit that permits transmission in both directions.
Note: For simultaneous two-way transmission, see full-duplex circuit.

Operating method in which transmission is possible simultaneously, in both directions of a telecommunication channel. [NTIA] [RR]
Note 1: This definition is not limited to radio transmission.
Note 2: In general, duplex operation and semi-duplex operation require two frequencies in radiocommunication; simplex operation may use either one or two. Synonyms full-duplex operation, two-way simultaneous operation.

In radar systems, a device that isolates the receiver from the transmitter while permitting them to share a common antenna.
Note 1: A duplexer must be designed for operation in the frequency band used by the receiver and transmitter, and must be capable of handling the output power of the transmitter.
Note 2: A duplexer must provide adequate rejection of… (Read More →)

1. In an ideal pulse train, i.e., one having rectangular pulses, the ratio of the pulse duration to the pulse period.
Note: For example, the duty cycle is
0. 25 for a pulse train in which the pulse duration is 1 s and the pulse period is 4 s.
2. The ratio of (a) the sum of all pulse durations… (Read More →)

Digital Video Broadcast

Digital Video Broadcast Technical Module-Internet Protocol Interface