Ceragon FA4800 - Stage 3: RF Survey; RF Planning for Dense Installations and Collocated Sites

Stage 3: RF Survey Chapter 2
FA4800 User Manual Release 1.9.40 2-4
• For IDU-C units, allow at least 90 cm (36 “) of front clearance for operating and main-
tenance accessibility. Allow at least 10 cm (4 “) clearance at the rear of the unit for
signal lines and interface cables
• The ambient operating temperature should be 0 to 50°C (32 to 122 °F) at a humidity
of up to 90%, non condensing
Stage 3: RF Survey
The RF survey examines the wireless environment of the installation site, to determine
whether there are available channels within the radio operating frequency band. An RF survey
is performed using a spectrum analyzer.
It is advisable to familiarize yourself with the spectrum analyzer before going out on site, spe-
cifically the Max Hold and Marker functions.
You should perform the RF survey at both proposed link sites.
The survey should be carried out during a busy time of day, to best judge the worst-case
radio interference. Allow 2-4 hours duration for a good RF survey.
RF Planning for Dense Installations and Collocated Sites
Interference may arise from
• Self interference from collocated Ceragon radios
• Other collocated radio devices installed on the same site.
To avoid or minimize interference, follow these recommendations:
• For collocated Ceragon units, use an HSS unit to synchronize between them. Select a
different operating channels for each collocated Ceragon unit.
• If one or more collocated units are not Ceragon units, ensure that there is a physical
separation of at least three meters between a Ceragon unit and any other collocated
radio on the site.
• Use the largest possible frequency gap between these units.
• Choose the best frequency channel (as clear as possible form interference). You may
change band with “Combo” FA4800 products and all FibeAir 2000 products).
• To select a frequency channel, move the link to Installation Mode (using Site con-
figuration) and start the Installation wizard. In the Channel Settings window, use
the quality bar at the bottom to help you choose a better channel (clearer of interfer-
ence).
• If you are using FA4800 radios, install the collocated links with different antenna
polarizations.
• If you are using the FibeAir 2000 radios, use the Spectrum View tool to find the best
working channel (Tools | Spectrum View).
Note
It is possible to install the link and use the FibeAir2000 Manager to find a
clear channel. Each frequency channel can be evaluated in turn.
Achievement of a clear channel is indicated by the marker in the Quality bar
on the Channel Setting window (see Figure 5-6) moving into the green
area.