User's Manual

ES2440 Hardware Guide
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IMPORTANT FCC INFORMATION
The Federal Communications Commission has released Office of Engineering and Technology
Laboratory Division Knowledge Database (KDB) 44399, which refines the definition of Dynamic
Frequency Selection (DFS) support. Since this device has the ability to use frequencies covered
by DFS, KDB 443999 must be followed. It is published in full on the FCC web site:
https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41732
In order to support FCC KDB 443999, Fortress has limited the use of certain frequencies within
the 5400–5725 MHz range. Specifically, the frequencies defined by the FCC as being of primary
interest are those in the 5600–5650 MHz range, which correspond to 802.11a channels 120, 124,
and 128. In order to comply with the KDB 443999, these channels have been removed from use,
or notched. Notched channels are unavailable for use on this device.
KDB 44399 provides additional restrictions on the use of channels within 30 MHz of notched
channels when the device is within 35 km of a Terminal Doppler Weather Radar (TDWR)
installation. Affected channels 116, 132, and 136 serve as a guard of 30 MHz around the critical
notched frequencies. Guard frequencies are unavailable for use on this device by default. The
FCC allows these channels to be used, however, as long as the device is not within 35 km of a
TDWR installation, as described in this excerpt of KDB 443999:
Any installation of either a master or a client device within 35 km of a TDWR location shall
be separated by at least 30 MHz (center-to-center) from the TDWR operating frequency.
In some instances it is possible that a device may be within 35 km of multiple TDWRs. In
this case the device must ensure that it avoids operation within 30 MHz for each of the
TDWRs. This requirement applies even if the master is outside the 35 km radius but
communicates with outdoor clients which may be within the 35 km radius of the TDWRs.
The requirement for ensuring 30 MHz frequency separation is based on the best
information available to date. If interference is not eliminated, a distance limitation based
on line-of-sight from TDWR will need to be used.
Please refer to the original KDB 443999 as posted on the FCC web site for the complete text.
In order to enable channels 116, 132, and/or 136, please contact Fortress to obtain a special
license. This license will be issued after it is confirmed that the installation is not within 30 MHz and
35 km of registered TDWR sites. The following table (provided by the FCC in KDB 443999
published on 10/14/2010) describes the locations of TDWR sites, as well as the frequencies at
which these sites operate:
TDWR Location Information TERRAIN
ELEVATION
(MSL) [ft]
ANTENNA
HEIGHT ABOVE
TERRAIN [ft]
STATE CITY LONGITUDE LATITUDE FREQUENCY
AZ PHOENIX W 112 09 46 N 33 25 14 5610 MHz 1024 64
CO DENVER W 104 31 35 N 39 43 39 5615 MHz 5643 64
FL FT LAUDERDALE W 080 20 39 N 26 08 36 5645 MHz 7 113
FL MIAMI W 080 29 28 N 25 45 27 5605 MHz 10 113
FL ORLANDO W 081 19 33 N 28 20 37 5640 MHz 72 97
FL TAMPA W 082 31 04 N 27 51 35 5620 MHz 14 80
FL WEST PALM BEACH W 080 16 23 N 26 41 17 5615 MHz 20 113
GA ATLANTA W 084 15 44 N 33 38 48 5615 MHz 962 113
IL MCCOOK W 087 51 31 N 41 47 50 5615 MHz 646 97
IL CRESTWOOD W 087 43 47 N 41 39 05 5645 MHz 663 113
IN INDIANAPOLIS W 086 26 08 N 39 38 14 5605 MHz 751 97
KS WICHITA W 097 26 13 N 37 30 26 5603 MHz 1270 80
KY
COVINGTON
CINCINNATI
W 084 34 48 N 38 53 53 5610 MHz 942 97
KY LOUISVILLE W 085 36 38 N 38 02 45 5646 MHz 617 113
LA NEW ORLEANS W 090 24 11 N 30 01 18 5645 MHz 2 97
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