PMP 400 and PTP 200 Series
Canopy User Guide Supplement
Issue 3, January 2009
Page 22 of 45
5.4 GHz
Region Code
1
AP
SM
Center Channel
Frequencies Available
2
(MHz)
equipment will provide DFS consistent with that regions’s regulations.
For countries or regions not listed, use a Region Code that provides DFS
functionality and channels consistent with your country’s regulatory
requirements.
2. In some countries and regions, 5600 MHz to 5650 MHz is “notched” out to
meet requirements to not transmit in weather radar frequencies.
3. FCC/IC indicates compliance with FCC Report and Order 03-287 and
Industry Canada requirements.
4. ETSI DFS indicates compliance with ETSI EN 301 893 v1.3.1
After an AP or BHM with DFS boots, it performs a channel availability check on its main carrier
frequency for 1 minute, monitoring for the radar signature, without transmitting. If no radar
signature is 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 module moves to its 1
st
alternate carrier frequency. It continues this behavior
through its 2
nd
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 or BHS only transmits if it is receiving beacon from an AP or BHS, the SMs or BHSs
in the sector are also not transmitting when the AP or BHM is not transmitting.
The FCC and IC require DFS only on APs and BHMs. Europe applies the ETSI specificiation to
both APs/BHMs and SMs/BHSs, while Brazil applies it only to APs and BHMs. In the ETSI case,
when an SM or BHS boots, it scans to see if an AP is present (if it can detect a Canopy beacon).
If an AP or BHM 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 or BHS proceeds through
normal steps to register to an AP or BHM.
•
If the SM or BHS does detect radar, it locks out that frequency for 30 minutes and
continues scanning other frequencies in its scan list.
Note, after an SM or BHS 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/BHM transmitting
frequencies, and SM/BHS scanned frequencies support that connection.
To simplify operation and ensure compliance, an SM or BHS 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
counts down from 60 to 1.
