Motorola PTP 400 Series - Manual (Page 126)

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When operating with RTTT Avoidance enabled or other regulatory restrictions on channel
usage the following variances apply:
• A channels marked with a ‘no entry’ symbol with their associated statistics colored black
are the prohibited channels. See Figure 64 and Figure 65. These channels are never
used to host the wireless link, but interference measurements are still taken so that
adjacent channel biases can be calculated correctly and so the user can see if other
equipment is in use.
Figure 64 - Spectrum Management Master Screen with Operational Restrictions