Cambium Networks PTP 250, User Manual

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Regulatory planning Chapter 2: Planning considerations
2-2 phn-2510_002v000 (Mar 2012)
Regulatory planning
This section describes how to plan PTP 250 links to conform to the regulatory restrictions
that apply in the country of operation. Contact the applicable radio regulator to find out
whether or not registration of the PTP 250 link is required.
It is the responsibility of the user to ensure that the PTP product is operated in
accordance with local regulatory limits.
Regulatory limits
The local regulator may restrict frequency usage and channel width, and may limit the
amount of conducted or radiated transmitter power.
Table 4 contains examples of the
regulatory limits that apply in typical countries of operation. Once the correct Country
Code is set by the user on first login, the PTP 250 caculates these limits automatically.
Many countries impose EIRP limits (Allowed EIRP) on products operating in the 5.4 GHz
and 5.8 GHz bands. These limits are calculated as follows:
x
In the 5.4 GHz band (5470 MHz to 5725 MHz), the EIRP must not exceed the lesser of
30 dBm or (17 + 10 x Log Channel width in MHz) dBm.
x
In the 5.8 GHz band (5725 MHz to 5875 MHz), the EIRP must not exceed the lesser of
36 dBm or (23 + 10 x Log Channel width in MHz) dBm.
Some countries (for example the USA) impose conducted power limits on products
operating in the 5.8 GHz band.
Table 4 Example of regulatory limits
Country Band Permitted
frequencies Radar avoidance
(DFS) required? Power limit
USA 5.4 GHz 5470 - 5600 MHz
5650 - 5725 MHz Yes (*) 30 dBm EIRP
USA 5.8 GHz 5725 - 5825 MHz No 30 dBm
conducted
UK 5.4 GHz 5470 - 5600 MHz
5650 - 5725 MHz Yes 30 dBm EIRP
Denmark 5.8 GHz 5725 - 5795 MHz
5815 - 5875 MHz Yes 36 dBm EIRP
(*) See also Avoidance of weather radars (USA only) on page 2-5 .