G.711 – CCITT recommendation detailing a 74 kbps, 7-kHz bandwidth audio coding algorithm.
G.722 – CCITT recommendation detailing a 32 kbps, 3.4-kHz bandwidth audio coding algorithm.
Garbage – Unwanted or meaningless information being stored in a file or used in a process.
Gateway – Conceptual or logical network station that interconnects two otherwise incompatible networks, network nodes, subnetworks or devices. Gateways perform protocol-conversion operations across a wide spectrum of communications functions or layers.
Geosynchronous orbit – Position over the equator that communication satellites assume; an area about 23,000 miles above the earth’s surface where a satellite’s velocity matches the rotation of the earth, causing it to remain stationary relative to a point on the earth.
Gigabyte – One billion or one thousand million (109) bytes.
Garbage in-garbage out (GIGO) – Phrase used to describe quality of data input and output within a computer system; specifically, if input data is bad (garbage in) then the output data will also be bad (garbage out).
Glitch – A hardware malfunction. [As opposed to a software error, called a bug.]
Grade of service – (1) A measurement of the quality of telecommunications related to the availability of circuits when calls are to be made. Grade of service is based on the busiest hour of the day. It is measured in either percentage of calls blocked for dial-up access or average delay for manual situations. (2) The probability of a call being blocked by busy trunks; expressed as a decimal fraction. It usually pertains to the busy-hour probability. Referred to as the “P” factor.
Graphics – (1) Use of the computer for drawing lines under complete program control. (2) The on-line attachment of a vector scope and light pen to the computer, enabling the user and the computer to interact and jointly draw pictures on the face of the scope.