A network of electrically interconnected rods, plates, mats, or grids, installed and connected, for the purpose of establishing a low-resistance contact with earth.

A radiocommunication service between Earth stations and one or more space stations, which may include links between space stations, in which: information relating to the characteristics of the Earth and its natural phenomena is obtained from active sensors or passive sensors on Earth satellites;
similar information is collected from airborne or Earth-based platforms;
such information may be distributed to Earth… (Read More →)

See ground.

A station located either on the Earth's surface or within the major portion of the Earth's atmosphere and intended for communication:with one or more space stations; or
with one or more stations of the same kind by means of one or more reflecting satellites or other objects in space. [NTIA] [RR] [47CFR]

In a satellite link, one of the non-orbiting communications stations that receives, processes, and transmits signals between itself and a satellite.
Note: Earth terminals may be at mobile, fixed, airborne, and waterborne Earth terminal complexes. Synonym satellite Earth terminal.

In satellite communications systems, the assembly of equipment and facilities necessary to integrate an Earth terminal into a communications network.
Note: The Earth terminal complex includes the Earth terminal and its support equipment and any required interconnect facilities and their support equipment. It does not include facilities at the site that are not necessary to establish and integrate the satellite… (Read More →)

1. Extended Area Service,
2. Emergency Alert System.

An aspect of the assessment of the effectiveness of a Target of Evaluation, namely that it cannot be configured or used in a manner which is insecure but which an administrator or end-user would reasonably believe to be secure [ITSEC].

NPA Codes that due to their unique, recognizable digit pattern (i.e., common 'B' and 'C' digit) convey certain unique knowledge re: a call to a telephone number other than the number being dialed (e.g., 800+). ERCs may be sometimes referred to as “NYY” codes to signify that N = digits 2-9 and YY = repeating digits 0-9.

Emergency Action Termination