RADAR AVOIDANCE
In regions where protection of radars is part of the local regulations, the ePMP must detect
interference from radar-like systems and avoid co-channel operation with these systems.
To meet this requirement, the ePMP implements the following features:
The equipment can only transmit on available channels, of which there are none at initial
power up. The radar detection algorithm will always scan a usable channel for 60 seconds for
radar interference before making the channel an available channel.
This compulsory channel scan will mean that there is at least 60 seconds service outage every
time radar is detected and that the installation time is extended by at least 60 seconds even if
there is found to be no radar on the channel
There is a secondary requirement for bands requiring radar avoidance. Regulators have mandated
that products provide a uniform loading of the spectrum across all devices. In general, this
prevents operation with fixed frequency allocations. However:
ETSI regulations do allow frequency planning of networks (as that has the same effect of
spreading the load across the spectrum).
The FCC does allow channels to be avoided if there is actually interference on them.
Note
When operating in a region which requires DFS, ensure that the AP is configured with alternate
frequencies and that the SM is configured to scan for these frequencies to avoid long outages.
ENCRYPTION
The ePMP supports optional encryption for data transmitted over the wireless link. The encryption
algorithm used is the Advanced Encryption Standard (AES) with 128-bit key size. AES is a
symmetric encryption algorithm approved by U.S. Government organizations (and others) to
protect sensitive information.
COUNTRY CODES
Some aspects of wireless operation are controlled, enforced or restricted according to a country
code. ePMP country codes represent individual countries (for example Denmark) or regulatory
regions (for example FCC or ETSI).
Country codes affect the following aspects of wireless operation:
Maximum transmit power
Radar avoidance
Frequency range
Caution
To avoid possible enforcement action by the country regulator, always operate links in
accordance with local regulations
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