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Appendix E - Glossary E-7
R
RF Radio Frequency – A generic term for signals at frequencies above those used
for baseband or IF.
RFC Request For Comment – The de-facto Internet standards issued by the Internet
Engineering Task Force (IETF).
RIP Routing Information Protocol
RS-232 A common electrical/physical standard issued by the IEEE used for point to
point serial communications up to approximately 115kb/s.
RS-485 A common electrical/physical standard issued by the IEEE used for multi-drop
serial communications.
Rx Receive.
S
SCPC Single Carrier Per Channel – A satellite communications technique where an
individual carrier is transmitted to a single destination.
SDMS Star Data Management System – VIPERSAT equipment forming the heart of
the V
IPERSAT system.
SMTP Simple Mail Transfer Protocol - A protocol for exchanging e-mail messages
between host computers. See also POP3.
SNMP Simple Network Management Protocol – A protocol defining how devices from
different vendors may be managed using a common network management
system.
SPL Synchronous Party Line – An electrically isolated interface between indoor and
outdoor equipment used in VIPERSAT satellite systems. See also APL.
SSPA Solid State Power Amplifier – A high power amplifier used in satellite commu-
nications using semiconductor rather than vacuum tube devices. See also HPA.
Star
Topology
A network topology which, if drawn as a logical representation, resembles a star
with a hub at the center.
STDMA An acronym for Selective Time Division Multiple Access