Comtech EF Data Vipersat CDM-570 User Manual page 140

Group ID A number assigned to equipment which defines it as a member of a group when
addressed by the burst controller.
GUI
Graphical User Interface – A form of graphical shell or user interface to a
computer operating system.
HDLC High Level Data Link Control – A standard defining how data may be transmit-
ted down a synchronous serial link.
HPA High Power Amplifier – The amplifier used in satellite communications to raise
the transmit signal to the correct power level prior to transmission to satellite.
See also SSPA.
HTTP
Hyper Text Transfer Protocol – The Internet standard for World Wide Web
(WWW) operation.
Hub The central site of a network which links to a number of satellite earth sites.
ICMP
Internet Control Message Protocol.
Installation A program which guides the user through the process of installing an applica-
Wizard
tion.
IF Intermediate Frequency – In satellite systems, IF frequencies are usually
centered around 1200 MHz (L-band), or 70 MHz (video/TV).
IP Internet Protocol – A format for data packets used on networks accessing the
Internet.
ISP Internet Service Provider – A company providing Internet access.
ITU International Telecommunications Union.
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