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Depending upon the link characteristic that the customer requires, this may very well be the best
choice. It increases consistency of link performance and equality in each direction as a trade-off
against maximum throughput.
Tx Max Power:This attribute controls the maximum transmit power the unit is permitted to
use when installing and executing the wireless link. The maximum setting for a particular region
or country is controlled by the License Key.
Platform Variant:Chooses between an integrated unit or a connectorized unit that requires an
external antenna.
Channel Bandwidth:Users can choose a variable channel bandwidth for the available spectrum.
Value is 15 MHz.
Spectrum Management Control:Is used to configure the PTP 500 Series Bridge's Spectrum
Management features, see
Section 8.3.7
"Spectrum Management" for more details. i-DFS is the
abbreviation for intelligent Dynamic Frequency Selection. This feature continually monitors the
spectrum looking for the channel with the lowest level of on channel and co-channel interference.
Fixed frequency mode allows the installer to fix transmit and receive frequencies on the units. The
frequencies may be configured symmetrically or asymmetrically.
Lower Center Frequency:The software for the PTP 500 Series Bridge allows a user to optionally
adjust the channel center frequencies. Changing the Lower Center Frequency attribute causes all
channel center frequencies to be offset. It effectively slides the channelization up or down. See
Sections
Section 5.5
"5.4 GHz Specific Frequency Planning Considerations" and
Section 5.6
"5.8 GHz Specific Frequency Planning Considerations" depending on the frequency variant.
Warning:
The lower center frequency attribute must be configured to the same value for both
the master and slave. Failure to do so will cause the wireless link to fail reestablishment. The only
way to recover from this situation is to modify the Lower Center Frequency attribute so that they
are identical on both the master and slave unit.
Fixed Transmit Frequency, Fixed Receive Frequency:The software for the PTP 500 Se-
ries Bridge allows a user to optionally fix the Transmit and the Receive frequencies for a wireless
link. The settings must be compatible at each end of the link. Once configured the spectrum
management software will not attempt to move the wireless link to a channel with lower co or
adjacent channel interference. Therefore this mode of operation is only recommended for deploy-
ments where the installer has a good understanding of the prevailing interference environment.
Figure 47
shows a sample fixed frequency configuration for a 30 MHz channel bandwidth. In the
example the lower center frequency is set to its default values and the Fixed Transmit Frequency
is set to 5735 MHz and the Fixed Receive Frequency is set to 5735 MHz. Care must be taken
when configuring the Fixed Transmit and Receive Frequencies to ensure that both frequencies are
on the same 5 MHz channel raster as the Lower Center Frequency. For example both the Fixed
Transmit and Receive Frequencies must be a multiple of 5 MHz from the Lower Center Frequency
(5740 = 5735 + 5 MHz) and (5745 = 5735 + 5 MHz x 2). Please note that there is a raster that
limits the selection of the Rx frequency based upon the setting of the Tx frequency, and that the
list of options presented in the fixed Tx frequency box is limited to that raster.
88
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