Compact Disc Types

Compact Disc (CD) Originally the common term for a compact audio disc, now used freely to refer any optical disc 4.75 inches (12 cm) in diameter containing information encoded digitally in the constant linear velocity (CLV) format. The official designation for an audio CD is compact disc-digital audio (CD-DA). The accompanying illustration shows the evolution of compact…

synchronous transport signal

(STS) (n.) The equivalent of a Synchronous Optical Network (SONET) optical carrier (OC), an electrical signal that is converted to an optical signal before transmission over optical fiber. An STS frame consists of the Synchronous Payload Envelope (SPE), Section Overhead (SOH), Line Overhead (LOH), Path Overhead (POH), and Payload. The SOH and LOH combined make…

logical area network

(LAN) (n.) Any physical network technology that operates at high speeds over short distances, such as several thousand yards. Technologies that play roles in a LAN include Ethernet, token ring, Asynchronous Transfer Mode (ATM), Fiber Distributed Data Interface (FDDI) II, 10BASE-T, and Systems Network Architecture (SNA). The system of cables and interfaces controlled by a…

Energy Star

(n.) An energy-efficiency guideline established by the Environmental Protection Agency (EPA) to identify an upper limit for wattage that an inactive computing device may draw. Compliance is voluntary, and manufacturers whose equipment meets the guidelines may display the Energy Star logo.

frequency modulation [FM]

(n.) Change in the frequency of a carrier signal that expresses information based on the rate and degree of change. FM has been a common technique for sound synthesis since it was proposed by John Chowning in 1971. The Yamaha DX-7 family of synthesizers used FM synthesis exclusively to generate sounds.