Redline Communications Inc. AN80IB 用户手册

 

 

User

 

 

AN-80i

 

Manual

 

 

70-00072-01-06a 

 

Page 95 of 96 

June 1, 2008 

LOS  

Line Of Sight. A clear direct path between two antennas, with no obstructions 

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.  

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. 

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 

Tx Transmitter 
UBR 

Uncoded Burst Rate