ArcLight Hub User’s Guide
xxiv 1081006 Rev. 001
SR Shift register A group of registers set up in a linear
fashion which have their inputs and
outputs connected together in such a way
that the data is shifted down the line
when the circuit is activated.
ST Satellite terminal or subscriber A ViaSat Mobile Terminal (see VMT).
Terminal
Support Server IBM class machine with Runs APR server, IsItUp, SNMP
Windows 2000 OpManager, and Term Viewer.
TBA To be added Text or graphic to be added.
TBD To be determined Information yet to be defined.
TCP/IP Transmit control protocol/ The set of communications protocols that
Internet protocol implement the protocol stack on which
the Internet and most commercial
networks run.
TELNET Teletype network A network protocol used on the Internet or
local area network LAN connections. Also
refers to the program which provides the
client part of the protocol. The "telnet"
client program may be used to make
interactive raw-TCP sessions and is used
to communicate to services such as POP3
servers without specialized client software.
TX IFL Transmit intermediate The intermediate portion of the microwave
frequency, L-Band band of the electromagnetic spectrum
ranging roughly from 0.39 to 1.55 GHz,
used for transmission by some
communications satellites.
UDP User datagram protocol A core protocol of the Internet protocol
suite. Using UDP, programs on networked
computers can send short messages
sometimes known as datagrams to one
another.
VCI Virtual cell identifier A unique identifier that indicates a
particular virtual circuit on a network. It
is a 16-bit field in the header of an ATM
cell. The VCI, together with the VPI
(Virtual Path Identifier) is used to identify
the next destination of a cell as it passes
through a series of ATM switches on its
way to its destination.
VCTCXO Voltage-controlled An electronic oscillator specifically
temperature-compensated designed to be controlled in oscillator
crystal oscillator frequency by a voltage input.
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