Wi Lan Inc EB02 Benutzerhandbuch

Determining Unit Configuration Settings

APR 2001 Rev 03

113

Configuration settings of units should be determined before installation to ensure easy installation and to 
reduce installation costs. An information sheet should be prepared for each unit that specifies the basic 
configuration settings of that unit. 

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Unit Name

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IP Address

•

Subnet Mask

•

Station Type

•

Station Rank

•

Center Frequency

•

Security passwords

•

Scrambling Code

•

Acquisition Code

•

Remote Unit RF Group

•

Transmit Power Level

You may also specify other settings such as remote distance, IP filtering and throttling.

Proper path planning ensures that each end of the RF link receives sufficient signal power to maintain the 
desired Bit Error Rate (BER). The effectiveness and reliability of your RF link depends on several factors.

•

Antenna gain and other characteristics

•

Distance between antennas and obstructions in the RF path

•

Location and height of antennas

•

Length and type of coaxial cable connecting the unit to the antenna

These factors are considered when you calculate your link budget. The calculation indicates, on paper, if your 
radio link is feasible over a given distance and path and if your RF link meets regulatory requirements. Link 
budgets are typically expressed in decibels (dB).

The following variables are used to calculate the link budget.

System Gain

Maximum path loss that the system can support for usable data transmission

EIRP (Effective 
Isotropically 
Radiated Power)

Power radiating from an antenna taking into account the output power from the 
transmitter, connector losses, cable losses and antenna gain

Antenna Gain

Gain of the antenna over a dipole (dBd) or theoretical (dBi)

Propagation Loss

Signal loss experienced as it travels through the air, expressed in dB