Advantech L-Band Satellite Modulator Especificaciones descargar pdf (Pagina 83)

Glossary

Term Description

Earth Technical Earth: A connection that ensures all equipment chassis within a

rack are at the same potential (“commoned”), usually by connecting a

wire between the technical earth terminal and a suitable point on the

rack. Also called a Functional Earth.

Protective Earth: A connection that ensures all exposed conductive

surfaces are at the same electrical potential as the surface of the Earth,

to avoid the risk of electrical shock if a person touches a device in which

an insulation fault has occurred. In the vent of an insulation fault (a “short

circuit”), a very high current flows, which triggers an overcurrent

protection device (fuse, circuit breaker, etc.) that disconnects the power

supply. Also called a Safety Earth.

EBU European Broadcast Union.

EIA Electronics Industries Association (USA).

EMC Electromagnetic Compatibility.

Encryption Encoding of a transmission to prevent access without the appropriate

decryption equipment and authorisation.

Ethernet The most widely used local area network (LAN) defined by the IEEE as the

802.3 standard. Transmission speeds vary according to the configuration.

Ethernet uses copper or fibre-optic cables.

ETSI European Telecommunications Standards Institute. Body created in 1988,

responsible for standardization of Information and Communication

Technologies (ICT) within Europe. These technologies include

telecommunications and broadcasting.

FCC Federal Communications Commission. A US government agency,

established by the Communications Act of 1934 and is responsible for

regulating all non-Federal Government use of the radio spectrum

(including radio and television broadcasting), and all interstate

telecommunications (wire, satellite and cable) as well as all international

communications that originate or terminate in the United States.

FDM Frequency Division Multiplex: A common communication channel for a

number of signals, each with its own allotted frequency.

FEC Forward Error Correction: A method of detecting and correcting errors in

a transmission. The data to be transmitted is processed through an

algorithm that generates code bits that are added to the message. The

code bits are used at the receiving end to check the accuracy of the

transmission and correct any errors.

Footprint The area of the Earth’s surface covered by a satellite’s downlink

transmission. Also (generally) the area from which the satellite can

receive uplink transmissions.

FTP File Transfer Protocol: A protocol used to transfer files over a TCP/IP

network (Internet, UNIX, etc.). For example, after developing the HTML

pages for a Web site on a local machine, they are typically uploaded to

the Web server, using FTP. Unlike e-mail programs in which graphics and

program files have to be attached, FTP is designed to handle binary files

directly and does not add the overhead of encoding and decoding the

data.

G.703 The ITU-T standard which defines the physical and electrical

characteristics of hierarchical digital interfaces.

SBM75e Series Modulator Installation and Operation Manual

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