User's Manual
38 AP 7161 Access Point Installation Guide
4 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. In addition, devices with
bandwidths greater than 20 MHz may require greater frequency separation.
• Procedures for the installers and the operators on how to register the devices in the industry-sponsored database with the
appropriate information regarding the location and operation of the device and installer information is included.6
• Devices must meet all of the other requirements specified in Section 15.407, and it is prohibited toinclude configuration
controls (e.g. country code settings or other options to modify DFS functions) to change the frequency of operations to any
frequency other than those specified on the grant of certification for US operation.7
• All applications for equipment authorization must clearly show compliance with all of the technical requirements under worst
case parameters, under user or operator control, based on frame rates, listen/talk ratios and user data transfer conditions.
All the devices subject to the DFS requirements must be submitted to the Commission’s Laboratory Division for pre-grant testing
and equipment authorization.8 The applicant must ensure that all equipment authorization applications subject to this interim
procedure include appropriate attestations that the device has no option to change the DFS parameters and that transmissions
are disabled at least in the 5600 – 5650 MHz band. The application must include the user’s manual with the appropriate
installation and operations requirements for the installers and operators.
We are continuing to evaluate additional measures that may need to be taken to further ensure against interference caused by 5
GHz outdoor wireless systems located near airports. While manufacturers have an obligation to ensure that their equipment
complies with FCC rules, and must take steps to ensure their devices are unlikely to cause harmful interference, Section 15.5 of
the Commission’s rules also places an obligation on users of devices to avoid causing interference and to correct any
interference that may occur.
We encourage the manufacturers to include information for the users, including the operators and installers, to ensure that they
understand that it is incumbent on them to cooperate with manufacturers to implement any changes necessary to facilitate
compliance.
5 Devices may be optionally designed not to transmit on channels which overlap 5570 – 5680 MHz instead of requiring installers
to perform site-by-site adjustments. In that case it is still required that the devices should be installed professionally and the
procedures for registering the device in the industry database should be included in the Users Manual.
6 A voluntary WISPA sponsored database has been developed that allows operators and installers to register the location
information of the UNII devices operating outdoors in the 5470 – 5725 MHz band within 35 km of any TDWR location (see
http://www.spectrumbridge.com/udia/home.aspx). This database may be used by government agencies in order to expedite
resolution of any interference to TDWRs.
7 For example, device software must not have any country code options or software configuration settings which allow an end
user to modify the DFS operation or impact the performance of DFS. See KDB 594280.
8 The TCBs are not permitted to approve transmitters with radar detection capabilities. See KDB 628591.
9 The manufacturers may consider taking steps providing clear instructions to operators and installers of devices as to the need
to comply with rules for use of the band, guidance on registration of devices and any other processes that are designed to avoid
interference. They may use methods that include, but are not limited to, instructions in manuals, notification on product web
pages and service bulletins issued for products in the field.
TDWR Location Information
STATE CITY LONGITUDE LATITUDE FREQUENCY TERRAIN
ELEVATION
(MSL) [ft]
ANTENNA
HEIGHT
ABOVE
TERRAIN [ft]
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 5 N 41 39 05 645 MHz 663 113