PTP 250 User Guide
Regulatory planning
phn-2510_002v000 (Mar 2012)
2-5
Avoidance of weather radars (USA only)
To comply with FCC rules (KDB 443999: Interim Plans to Approve UNII Devices Operating
in the 5470 - 5725 MHz Band with Radar Detection and DFS Capabilities), units which are
installed within 35 km (22 miles) of a Terminal Doppler Weather Radar (TDWR) system (or
have a line of sight propagation path to such a system) must be configured to avoid any
frequency 30 MHz or –30 MHz of the frequency of the TDWR device.
This
requirement applies even if the master is outside the 35 km (22 miles) radius but
communicates with outdoor clients which may be within the 35 km (22 miles) 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. In addition, devices with bandwidths
greater than 20 MHz may require greater frequency separation.
When planning a link in the USA, visit
http://spectrumbridge.com/udrs/home.aspx
, enter
the location of the planned link and search for TDWR radars. If a TDWR system is located
within 35 km (22 miles) or has line of sight propagation to the PTP device, perform the
following tasks:
x
Register the installation on
http://spectrumbridge.com/udrs/home.aspx
.
x
Use
Table 5
to identify channel center frequencies that must be unselected, that is,
those falling 30 MHz or –30 MHz of the frequency of the TDWR radars.
Table 5
Channels to be avoided when close to TDWR radars
PTP 250 channel
width
TDWR frequency
Channels to be unselected in
Step 2: Wireless Configuration
20 MHz
<= 5610 MHz
5580 (116)
20 MHz
>= 5630 MHz
5660 (132)
40 MHz
>= 5630 MHz
Channel pair 5660 & 5680 (132 & 136)
To comply with FCC rules, the affected channels must be unselected during staging,
before the units are allowed to radiate on site, as described in
Step 1: Wireless
configuration
on page
6-22
.
Summary of Contents for PTP 250
Page 1: ...Cambium PTP 250 User Guide System Release 250 02 01 ...
Page 8: ...Safety and regulatory information VI phn 2510_002v000 Mar 2012 ...
Page 20: ...List of Tables xii phn 2510_002v000 Mar 2012 ...
Page 58: ...System management Chapter 1 Product description 1 30 phn 2510_002v000 Mar 2012 ...
Page 104: ...Limit of liability Chapter 3 Legal information 3 12 phn 2510_002v000 Mar 2012 ...
Page 122: ...Notifications Chapter 4 Reference information 4 18 phn 2510_002v000 Mar 2012 ...
Page 152: ...Installing the PoE power supply Chapter 5 Installation 5 30 phn 2510_002v000 Mar 2012 ...