Regulatory Information 36
Regulatory limits
The local regulator may restrict frequency usage and channel width and may limit the amount of
conducted or radiated transmitter power.
Many countries impose EIRP limits (allowed EIRP) on products operating in the bands used by the
ePMPSeries. For example, in the 5 GHz band in Europe, these limits are calculated as follows:
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In the 5.8GHz band (5725 MHz to 5875 MHz), the EIRP must not exceed the lesser of 36 dBm or
(23 + 10 x Log Channel width in MHz) dBm.
Some countries (for example the USA) impose conducted power limits on products operating in the 5
GHz band.
Conforming to the limits
Ensure the link is configured to conform to the 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 prevent the operation automatically 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 can 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 allows operation on those channels only 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 5.8GHz 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
does 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 on 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.
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