42
5.6 5.8GHz Specific Frequency Planning Considerations To fully utilize the 5.725 to 5.850 GHz of allocated spectrum the operator must adjust the
lower center frequency attribute in the installation wizard, described in detail in 8.3.5 “Install
Wizard Pages” Adjustment of the lower center frequency allows the operator to slide the
available frequency settings up and down the 5.8 GHz band. See Figure 14
5732 5738 5744 5750 5756 5762 5768 5774 5780 5786 5792 5798 5804 5810 5816 5822 5828 5834 5840
5734 5740 5746 5752 5758 5764 5770 5776 5782 5788 5794 5800 5806 5812 5818 5824 5830 5836 5842
5736 5742 5748 5754 5760 5766 5772 5778 5784 5790 5796 5802 5808 5814 5820 5826 5832 5838 5844
Band Edge
5725 MHz
Band Edge
5850 MHz
Default
Available Frequency Settings (MHz)
5732 MHz
5734 MHz
5736 MHz
Lower Centre
Frequency
Band Edge
5850 MHz
Band Edge
5725 MHz
Figure 14 - 5.8 GHz Available Spectrum Settings
5.6.1 Raster Considerations
The PTP 400 Series Bridge 5.8 GHz variant operates on a 6 MHz channel raster that is set to
even center frequencies. see Figure 14.
5.6.2 Fixed Frequency Operation
When operating in ‘Fixed Frequency’ mode (see section 8.3.5.3 “Wireless Configuration”) the
operator can set the operating frequency independently in both directions to any of the center
frequencies available in i-DFS mode using the ‘Default Raster’ setting. For the expert user
further granularity can be obtained by turning off the ‘Default Raster’. In this mode the
operator is able to select any even frequency that sets the channel in-band.
5.6.3 Transmit Power Reduction at the Band Edges
Operation at or near the 5.8 GHz band edges can results in a lower maximum transmit power.
In some configurations the PTP 400 Series Bridge reduces the power when operating at the
edge channels. The amount of reduction if any is dependant on the local regulator authority of
the region of operation. These currently only affect systems configured with Region Code 1.
The power reduction in the edge channels is presented in Figure 15.