Analyzing The Rf Spectrum; Accessing The Spectrum Analyzer; Setting Up The Spectrum Analyzer - Airspan ASWipLL Quick Installation And Configuration Manual

AS W i p L L 9 0 0 M H z

Analyzing the RF Spectrum

Before setting up your wireless link between Base Station and subscribers, Airspan recommends analyzing
the RF spectrum at the Base Station to select only clear frequency channels (i.e. without interferences) for
building a frequency table for the wireless transmission.
Airspan recommends using frequencies that are approximately 28, 20, and 12 dB above interference levels to
effectively operate in 8- (4 Mbps/3 Mbps), 4-(2 Mbps), and 2-level FSK (1.33 Mbps/1 Mbps), respectively.
Notes:
1) Airspan's Spectrum Analyzer feature, which plugs into WipConfig, is license-dependant.
2) Ensure all other ASWipLL devices are powered off, except the device whose spectrum you are analyzing.
3) Mount the ASWipLL device prior to commencing the spectrum analysis.
4) The spectrum analysis should be performed in continuous mode for at least 20 times. The longer you
perform the sweep, the more reliable results are obtained as interference in the ISM band can change
throughout the day or change rapidly (e.g. in frequency hopping systems).
5) To ensure locating clear frequencies, continually narrow down the sweep frequency range. For example,
first sweep a large frequency range. Once you have selected a clear area from this initial sweep, run another
batch of sweeps concentrating on these selected frequencies. The fewer frequencies the more reliable the
analysis for capturing bursty, intermittent transmitters (e.g. pagers).
6) When using external antenna, ensure correct Antenna Gain is defined with consideration to RF cable loss.
7) As interference depends on geographical locations, it is recommended to perform spectrum analysis at the
CPE location when installing the ASWipLL IDR device.

9.1. Accessing the Spectrum Analyzer

You can access the Spectrum Analyzer through either a serial or an IP network communication mode.
To access the Spectrum Analyzer:
1. Start WipConfig and then connect WipConfig to the BSR by performing one of the following:
Serial mode: on the toolbar, select the Serial option, and then click Connect.
IP mode: on the toolbar, select the Network option, and then in the Remote Agent field, enter the
ASWipLL device's IP address, and then click Connect.
2. In the Outlook bar, click the Spectrum Analyzer
the device will lose connection with all other devices.
3. Click OK.

9.2. Setting up the Spectrum Analyzer

Before you can start analyzing the spectrum, you need to define various parameters in the Spectrum Analyzer.
To set up the Spectrum Analyzer:
1. Ensure the Setup tab (located in the top-right pane) is selected.
2. In the Refresh Rate field, enter the rate (in seconds) for polling the BSR/PPR. (The default is 3 sec;
maximum is 3600 sec.)
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button; A message box appears informing you that
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