Motorola PTP 600 Series User Manual page 163

8 Web Page Reference
CAUTION: 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.
Default Raster: If this is set to "On", the list of options presented in the fixed Tx frequency
box is limited by the default raster.
Fixed Tx Frequency, Fixed Rx Frequency: Only displayed when Spectrum Management
Control is set to "Fixed Frequency". The software for the PTP 600 Series 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-channel or
adjacent channel interference. Therefore this mode of operation is only recommended for
deployments where the installer has a good understanding of the prevailing interference
environment. Figure 70 shows an example fixed frequency configuration for a 30 MHz
channel bandwidth. In this example, the Fixed Transmit Frequency is set to 5742 MHz and
the Fixed Receive Frequency is set to 5742 MHz. Care must be taken when configuring the
Fixed Transmit and Receive Frequencies to ensure that both frequencies are on the same
channel raster as the Lower Center Frequency. For example, if the channel raster is 10 MHz,
both the Fixed Transmit and Receive Frequencies must be a multiple of 10 MHz from the
Lower Center Frequency (5752 = 5742 + 10 MHz) and (5782 = 5742 + 10 MHz u 3).
NOTE: A raster limits the selection of the Rx frequency based upon the setting of the Tx
frequency.
Tx Color Code, Rx Color Code: When co-channel interference is from another PTP 600, co-
channel performance is improved by selecting different values for the Color Code attribute at
the victim and interfering links. For the vast majority of links, both Color Code parameters can
use the default value "A". The parameter only requires consideration when planning complex
networks. If the network planner deems that there is a significant level of co-channel
interference from a synchronized PTP 600, performance can be optimised by setting the
victim Rx Color Code and the interfering Tx Color Code to different values. Tx Color Code at
one end of the link must always be set to the same value as Rx Color Code at the other end
of the link. For more information, see Section 5.13 "Color Codes".
NOTE: As long as the victim Rx Color Code and interferer Tx Color Code are different, the
same level of optimization will be achieved, that is, an A / B combination is as good as an A /
E combination.
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