Conforming to the limits
Ensure the link is configured to conform to local regulatory requirements by configuring the correct
country code (located in the web management interface, under
Configure
>
Radio
). In the following
situations, the country code does not automatically prevent operation outside the regulations:
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When operating in ETSI regions, it is required to enter a license key in the ePMP web management
interface to unlock valid country-specific frequencies. This key may be obtained from
https://support.cambiumnetworks.com/licensekeys/epmp.
Available spectrum
The available spectrum for the 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.
Certain regulations have allocated certain channels as unavailable for use:
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Some European countries have allocated part of the 5.8 GHz band to Road Transport and Traffic
Telematics (RTTT) systems.
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 some 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 are dependent on the
channel bandwidth.
Channel bandwidth
Select the required channel bandwidth for the link. The selection depends upon the ePMP frequency
variant and country code.
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.
Link planning
This section describes factors to be taken into account when planning links, such as range, obstacles path
loss, and throughput.
Range and obstacles
Calculate the range of the link and identify any obstacles that may affect radio performance.
Perform a survey to identify all the obstructions (such as trees or buildings) in the path and to assess the
risk of interference. This information is necessary to achieve an accurate link feasibility assessment.
Path loss
Path loss is the amount of attenuation the radio signal undergoes between the two ends of the link. The
path loss is the sum of the attenuation of the path if there were no obstacles in the way (Free Space Path
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