Comtech EF Data SLM-5650A Vipersat - Manual (Page 143)

Appendix D - Glossary D-5
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.
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
(Remotes).
I
ICMP Internet Control Message Protocol
IDU Indoor Unit – In a VSAT system, the satellite modem is referred to as the IDU.
IF Intermediate Frequency – In satellite systems, IF frequencies are usually
centered around 70/140 MHz (video/TV), or 1200 MHz (L-band).
IFL Intra-Facility Link – The coaxial cabling used to connect the satellite ODU to
the IDU. Carries the inbound and the oubound signals, and the 24 VDC for the
LNB.
Image A binary firmware file that provides the operational code for the processor(s) in
a network unit.
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
K
kbps kilo bits per second – 1000 bits/second. A measure of the bit rate or transmis-
sion speed of a digital communication link. See also bps and Mbps.
Ku-band A frequency band used for satellite communications. For terrestrial earth
stations, the receive frequency band is in the range 10.95–12.75 GHz and the
transmit frequency band is 13.75–14.5 GHz. See also C-band and L-band.