Comtech EF Data SLM-5650A Vipersat Parameter Editor - Manual (Page 72)

A-8 SLM-5650A Parameter Editor User Guide
Q
QAM Quadrature Amplitude Modulation – A digital modulation technique in which
the amplitude of two carrier waves is changed to represent the data signal. These
two waves are 90 degrees out of phase with each other.
QoS Quality of Service
QPSK Quadrature Phase-Shift Keying – A digital modulation technique in which the
carrier is phase shifted +/- 90 or +/-180 degrees. With four phases, QPSK can
encode two bits per symbol—twice the rate of BPSK. However, it also uses
twice the power. Also known as 4-PSK or 4-QAM.
R
Remote Satellite earth site that links to a central network site (Hub).
Return Path Transmission path from a Remote site to the Hub site.
RF Radio Frequency – A generic term for signals at frequencies above those used
for baseband or IF.
RFC Request For Comment – The official publication channel for Internet standards
(such as communication protocols) issued by the Internet Engineering Task
Force (IETF).
RIP Routing Information Protocol
ROSS Roaming Oceanic Satellite Server
RS-232 A common electrical/physical standard issued by the IEEE used for point to
point serial communications up to approximately 115 kb/s.
RTP Real-time Transport Protocol – A standardized packet format for delivering
real-time applications such as audio and video over the Internet. Frequently
used in streaming media systems, videoconferencing, and VoIP.
Rx Receive