For a satellite orbiting the Earth, an orbit in which the projection of the satellite on the equatorial plane revolves about the Earth in the same direction as the rotation of the Earth.

An automated PBX service feature that provides for outgoing calls to be dialed directly from the user terminal. Synonym network outward dialing.

A ray of electromagnetic radiation that follows the path of least possible propagation time between transmitting and receiving antennas.
Note: The path of least propagation time is not always the shortest distance path.

In facsimile systems, recording in which a visible record is produced, without subsequent processing, in response to received signals.

A communication cable manufactured or produced for the purpose of burial in direct contact with the earth.

In spread-spectrum systems, modulation in which a sequence of binary pulses is used directly to modulate a carrier, usually by phase-shift keying. Synonym direct-spread modulation. [From Weik '89]

1. A system (a) for generating spread-spectrum transmissions by phase-modulating a sine wave pseudorandomly with a continuous string of pseudonoise code symbols, each of duration much smaller than a bit and (b) that may be time-gated, where the transmitter is keyed periodically or randomly within a specified time interval.
2. A signal structuring technique utilizing a digital code sequence having… (Read More →)

Synonym direct-sequence modulation.

An Internet Protocol address that specifies "all hosts" on a specified network.
Note: A single copy of a directed broadcast is routed to the specified network, where it is broadcast to all terminals on that network.

A radio net in which no station other than the net control station may communicate with any other station without first obtaining permission from the net control station.
Note: A directed net is established by the net control station. The net control station may restore the net to a free net. [From Weik '89]