User's Guide

4 Planning Considerations
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4 Planning Considerations
This section provides information to help the user to plan a PTP 500 link.
Each frequency variant has specific licensing restrictions that affect frequency range, channel
bandwidth, maximum power and radar avoidance. Link planning must take account of
obstructions, site selection, path loss and wind loading.
The following topics are described in this section:
• 4.1 Spectrum Planning
• 4.2 Licenses and Region Codes
• 4.3 Radar Avoidance and Bandwidth Operation
• 4.4 Variable Channel Bandwidth Operation
• 4.5 Link Planning
• 4.6 Site Selection Criteria
• 4.7 Wind Loading
• 4.8 Path Loss Considerations
• 4.9 System Threshold, Output Power and Link Loss
To calculate
the data throughput capacity of a planned PTP 500 link, see Section 12 “Data
Rate Calculat
ions”.
4.1 Spectrum Planning
The PTP 500 may use one of four alternative methods of spectrum planning. The choice of
methods depends upon whether or not the region mandates radar detection.
4.1.1 Regions Without Mandatory Radar Detection
In regions that do not mandate DFS (Radar Detection), the frequencies may be configured
symmetrically or asymmetrically (different transmit and receive frequencies). The Spectrum
Management Control options are:
• Intelligent Dynamic Frequency Selection (i-DFS): This method continually monitors the
spectrum looking for the channel with the lowest level of on channel and co-channel
interference. Statistical techniques are used to select the most appropriate transmit and
receive channels. The i-DFS mode can be influenced in its channel decision process by
selectively barring channels from use.