User manual

& User
AN-80i
Manual
70-00072-01-08b Proprietary Redline Communications © 2009 Page 126 of 128 June 4, 2009
Table 71: Spec. - Glossary
Term Definition
MHz Megahertz. 1,000,000 Hz
Modem MOdulator/DEModulator. A hardware device that converts digital data into
analog and vice versa.
Modulation Any of several techniques for combining user information with a transmitter
carrier signal.
Multipath The radio echoes created as a radio signal bounces off objects.
NVRAM Non-volatile RAM. System parameters are stored in NVRAM. This data is not
affected by powering off the system.
NLOS Non Line Of Sight. Completely obstructed path between two antennas.
OFDM Orthogonal Frequency Division Multiplexing. OFDM spreads data to be
transmitted over a large number of orthogonal carriers.
OLOS Optical Line Of Sight. A clear direct path between two antennas, with
obstructions within the first Fresnel zone.
Packet A bundle of data organized in a specific way for transmission. The three
principal elements of a packet include the header, the text, and the trailer (error
detection and correction bits).
PHY Physical Layer. Provides for the transmission of data through a communications
channel by defining the electrical, mechanical, and procedural specifications.
PIR Peak Information Rate
PMP Point to Multipoint
PTP Point to Point
QAM Quadrature Amplitude Modulation
QPSK Quadrature Phase Shift Keying
Receiver
Sensitivity
A measurement of the weakest signal a receiver can receive and still correctly
translate it into data.
RF Radio Frequency
RSSI Received Signal Strength Indication
Rx Receiver
S/N Signal to Noise Ratio
SINADR Signal to noise and distortion ratio.
SSL Secure Sockets Layer, a communications protocol, superceded by Transport
Layer Security (TLS).
TCP/IP Transmission Control Protocol/Internet Protocol
The standard set of protocols used by the Internet for transferring information
between computers, handsets, and other devices.
TFTP Trivial File Transfer Protocol
TLS Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer
(SSL), are cryptographic protocols that provide secure communications on the
Internet for web browsing, e-mail, Internet faxing, instant messaging, and other
data transfers.
Tx Transmitter
UBR Uncoded Burst Rate