Redline Communications Inc. AN80I 用户手册
Red
CONNEX
TM
AN-80i
PTP & PMP
User Manual
70-00072-01-04-DRAFT
Proprietary Redline Communications © 2007
May 7, 2007
Page 89 of 91
Table 44: Spec. - Glossary
Term Definition
LOS
Line Of Sight. A clear direct path between two antennas, with no obstructions
within the first Fresnel zone.
within the first Fresnel zone.
MAC
Media Access Control. A unique number assigned to a network device.
Corresponds to ISO Network Model Layer 2 data link layer.
Corresponds to ISO Network Model Layer 2 data link layer.
MHz
Megahertz. 1,000,000 Hz
Modem
MOdulator/DEModulator. A hardware device that converts digital data into
analog and vice versa.
analog and vice versa.
Modulation
Any of several techniques for combining user information with a transmitter
carrier signal.
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.
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.
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).
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.
channel by defining the electrical, mechanical, and procedural specifications.
PMP
Point to Multipoint
PTP
Point to Point
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
Receiver
Sensitivity
Sensitivity
A measurement of the weakest signal a receiver can receive and still correctly
translate it into data.
translate it into data.
RF Radio
Frequency
Rx Receiver
S/N
S/N
Signal to Noise Ratio
SINADR
Signal to noise and distortion ratio.
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.
The standard set of protocols used by the Internet for transferring information
between computers, handsets, and other devices.
TFTP
Trivial File Transfer Protocol
Tx Transmitter
UBR
UBR
Uncoded Burst Rate