1 raster considerations, 2 fixed frequency operation, 3 transmit power reduction at the band edges – Motorola PTP 400 Series User Manual

Page 44: 8ghz specific frequency planning considerations, Raster considerations, Fixed frequency operation, Transmit power reduction at the band edges, Figure 14 - 5.8 ghz available spectrum settings

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.