User's Manual

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Control Slots are reserved for SMs’ bandwidth requests and never handle data. A higher number of
control slots gives higher probability that an SM’s bandwidth request will be heard when the system is
heavily loaded, but with the tradeoff that sector capacity is reduced by about 100 kbps for each Control
Slot configured, so there will be less capacity to handle the request.
Uplink Data Slots are used first for data. If they are the not needed for data in a given frame the data slot
can be used by the SMs for bandwidth requests. This allows SMs in sectors with zero control slots
configured to still make bandwidth requests using unused data slots.
Downlink Data %, Range, and Control Slots should be set consistent with the results of any collocation
planning done using OFDM and FSK frame calculators.
The BHM performs its own ranging and so no range need be set for it.
BHMs do not have settings for control slots, as there is no bandwidth request contention on the one-to-
one link.
4.4 BACKGROUND AND OPERATION
The modules use region-specific DFS based on the “Region Code” selected on the module’s
“Configuration => General” page. By directing installers and technicians to set the Region 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.
Available “Region Codes” include Other, United States, Canada, Europe, Brazil, Russia, and Australia.
Operators in regions or countries not listed and with requirements aligned with one of the listed countries
should set the Region Code to that country. Operators in regions or countries with no requirements for
DFS should use the “Other” Region Code.
New APs and BHMs from the factory will show a Region Code of “None”, and will not transmit until the
Region Code is set to a value other than “None”.
Canada, United States and Europe have requirements to avoid certain frequencies used by some
weather radar. To meet this requirement, modules set to a Region Code of Canada, United States or
Europe will display the center channel frequencies on the AP’s and BHM’s Carrier Frequency pop-up and
on the SM’s and BHS’s Frequency Scan Selection List.
Table 4 shows the details of DFS operation and channels available for each Region Code, including
whether DFS is active on the AP/BHM, SM/BHS, which DFS regulation apply, and any channel
restrictions..
Table 4: 5.8 GHz OFDM DFS Operation based on Region Code
Region Code
1
Frequency AP SM
Center Channel
Frequencies Available
2
(MHZ)
United States 5.8 GHz No Effect No Effect 5730-5845
Canada 5.8 GHz No Effect No Effect 5730-5845
1. In all cases set the Region Code to the region you are in and the equipment will provide DFS consistent with
that region’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.