User's Guide

PTP 250 User Guide Regulatory planning
phn-2182_003v004 (Oct 2011)
UNDER DEVELOPMENT
2-3
Conforming to the limits
When a new PTP 250 unit is first accessed via the web interface, the user is required to
select the Country Code from a list. Generally, the PTP 250 firmware does not allow the
unit to be configured to operate outside the regulatory limits that apply to the selected
country. However, in the following situations, the firmware does not automatically prevent
operation outside the regulations:
• When using connectorized ODUs with external antennas, the regulations may require
the maximum transmit power to be reduced. To ensure that regulatory requirements
are met for connectorized installations, refer to Calculating maximum power level for
c
onnectorized units on page 2-13.
• When
installing 5.4 GHz links in the USA, it may be necessary to avoid frequencies
used by Terminal Doppler Weather Radar (TDWR) systems. For more information, refer
to Avoidance of weather radars (USA only) on
page 2-5.
Available spectrum
The available spectrum for operation depends on the country of operation:
• The 5.4 GHz band is available in all EU countries.
• The 5.8 GHz band is currently only available in a limited number of EU countries (UK,
Eire, Norway, Denmark, Germany and Spain).
Certain regulations have allocated certain channels as unavailable for use:
• Europe has allocated part of the 5.4 GHz band to weather radar.
• The UK and some other European countries have allocated part of the 5.8 GHz band to
Road Transport and Traffic Telematics (RTTT) systems.
For examples of these restrictions, refer to Regulatory limits on
page 2-2.
Where regulatory restrictions apply to certain channels, these channels are barred
automatically by the use of the correct country setting. For example, at 5.8 GHz in the UK
and some other European countries, the RTTT band 5795 MHz to 5815 MHz is barred.
With the appropriate configuration for a country in this region, the PTP 250 will not
operate on channels within this band.
The number and identity of channels barred by the country selection is dependent on the
channel width selected.