Motorola 5440AP - Canopy 5.4 GHz AP User Manual Supplement page 20

Canopy 400 Series OFDM AP and SM
detected during this minute, the module then proceeds to normal beacon transmit mode. If it does
detect a radar signature, the frequency is marked for a 30 minute non-occupancy period, and the
st
module moves to its 1
alternate carrier frequency if needed, then will wait until the first frequency ends its 30 minute
non-occupancy period. If while in operation, the AP or BHM detects the radar signature, it mark
its current carrier frequency for a 30 minute non-occupancy period, and move to trying the next-
in-line carrier frequency.
Since an SM only transmits if it is receiving beacon from an AP, the SMs in the sector are also
not transmitting when the AP is not transmitting.
The FCC and IC require DFS only on APs. The ETSI specificiation requires DFS on APs and
SMs. In the ETSI case, when an SM boots, it scans to see if an AP is present (if it can detect a
Canopy beacon). If an AP is found, the SM performs a channel availability check on that
frequency for 1 minute, monitoring for the radar signature, without transmitting.
If no radar pulse is detected during this 1 minute, the SM proceeds through normal
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steps to register to an AP.
If the SM does detect radar, it locks out that frequency for 30 minutes and continues
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scanning other frequencies in its scan list.
Note, after an SM with DFS has seen a radar signature on a frequency and locked out that
frequency, it may connect to a different AP or BHM if color codes, AP transmitting frequencies,
and SM scanned frequencies support that connection.
To simplify operation and ensure compliance, an SM takes on the DFS type of the AP it is
registering to. For example, when an SM in Europe registers to an AP with the Region Code set
to "Europe", that SM will use ETSI DFS, no matter what its Region Code is set to, even if its
Region Code is set to "None". Note, the operator should still configure the Region Code in the SM
correctly, as future releases may use the Region Code for additional region-specific options.
For all modules running DFS, the module displays its DFS state on its Home => General Status
page as one of the following:
Checking Channel Availability Remaining time n seconds, where n
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counts down from 60 to 1.
Normal Transmit
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Radar Detected Stop Transmitting for n minutes, where n counts down
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from 30 to 1.
Idle, only for SM or BHS, indicates module is scanning, but has not detected a
•
beacon from an AP or BHM. Once it detects beacon, the SM or BHS begins a
Channel Availability Check on that frequency.
4.4.2 Setting DFS and Regulatory Parameters
Setting the Region Code
All modules display a Region Code pop-up on the :Configuration => General" page, as shown in
Figure 5.
On new modules from the factory, or after resetting to factory defaults, the operator should set
this Region Code consistent with their country or region. For countries or regions not listed in the
Region Code pop-up, set the Region Code consistent with your country's regulatory
requirements. (For example, several countries in South America follow the same DFS regulations
as Brazil, so in those countries the Region Code should be set to "Brazil".)
Version 1, April 2008
alternate carrier frequency. It continues this behavior through its 2
User Guide
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