PTP 450 Configuration and User Guide
Compliance with radio regulations
6-16
pmp-0815 (August 2015)
DFS for 5.4 GHz Radios
Dynamic Frequency Selection (DFS) is a requirement in several countries and regions
for 5 GHz unlicensed systems to detect radar systems and avoid co-channel operation.
DFS and other regulatory requirements drive the settings for the following parameters,
as discussed in this section:
Country Code
Primary Frequency
Alternate 1 and Alternate 2 Frequencies
External Antenna Gain
On the BHM, the
Home => DFS Status
page shows current DFS status of all three
frequencies and a DFS log of past DFS events.
Figure 53
BHM DFS Status
Background and Operation
The modules use region-specific DFS based on the
Country Code
selected on the
module’s Configuration, General page. By directing installers and technicians to set the
Country Code correctly, the operator gains confidence the module is operating
according to national or regional regulations without having to deal with the details for
each region.
Some regions have requirements to avoid certain 5.4 GHz frequencies used by some
weather radar. To meet this requirement, modules set to Europe will display the certain
channel frequencies on the BHM’s Carrier Frequency pop-up and on the BHS’s
Frequency Scan Selection List.
Details of DFS operation and channels available for each Country Code including
whether DFS is active on the BHM, BHS, which DFS regulation applies and any channel
restrictions are shown in
on page
. DFS does not apply to 4.9 GHz.
