When installing 5.4 GHz links in the USA, it may be necessary to avoid frequencies used by
Terminal Doppler Weather Radar (TDWR) systems. For more information, see Avoidance of
weather radars on page 94.
AVAILABLE SPECTRUM
The available spectrum for operation depends on the region. When configured with the
appropriate country code, the unit will only allow operation on those channels which are permitted
by the regulations.
Note
In Italy, there is a regulation which requires a general authorization of any 5.4 GHz radio
link which is used outside the operator’s own premises. It is the responsibility of the
installer or operator to have the link authorized. For details, see:
http://www.sviluppoeconomico.gov.it/index.php?option=com_content&view=article&idme
nu=672
&idarea1=593&andor=AND&idarea2=1052&id=68433§ionid=1,16&viewType=1&show
Menu=1&showCat=1&idarea3=0&andorcat=AND&partebassaType=0&idareaCalendario1=
0&MvediT=1
&idarea4=0&showArchiveNewsBotton=0&directionidUser=0
For the form that must be used for general authorization, see:
http://www.sviluppoeconomico.gov.it/images/stories/mise_extra/Allegato%20n19.doc
Certain regulations have allocated certain channels as unavailable for use:
ETSI has allocated part of the 5.4 GHz band to weather radar.
UK and some other European countries have allocated part of the 5.8 GHz band to Road
Transport and Traffic Telematics (RTTT) systems.
For details of these restrictions, see Examples of regulatory limits on page 446.
Where regulatory restrictions apply to certain channels, these channels are barred automatically
by the use of the correct country code. For example, at 5.8 GHz in the UK and some other
European countries, the RTTT band 5795 MHz to 5815 MHz is barred. With the appropriate country
code configured for this region, the ePMP will not operate on channels within this band.
The number and identity of channels barred by the license key and country code is dependent on
the channel bandwidth.
For more information about configuring the Country Code parameter, see AP Radio page on page
125 and SM Radio page on page 194.
CHANNEL BANDWIDTH
Select the required channel bandwidth for the link. The selection depends upon the ePMP
frequency variant and country code, as specified on page 446.
The wider a channel bandwidth the greater is its capacity. As narrower channel bandwidths take
up less spectrum, selecting a narrow channel bandwidth may be a better choice when operating in
locations where the spectrum is very busy.
Both ends of the link must be configured to operate on the same channel bandwidth.
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