Spectrum Planning; Regions Without Mandatory Radar Detection; Regions With Mandatory Radar Detection - Motorola PTP 48600 User Manual

Spectrum planning

Spectrum planning
The PTP 600 may use one of four alternative methods of spectrum planning. The
choice of methods depends upon whether or not the region mandates radar detection.

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.
•
Fixed Frequency: This method allows the installer to allocate fixed transmit and
receive frequencies on the units.

Regions with mandatory radar detection

In regions that mandate DFS (Radar Detection), the frequency must always be
symmetrical (transmit and receive on the same frequency). The Spectrum
Management Control options are:
•
Dynamic Frequency Selection (DFS): This method detects interference from
other systems and avoids co-channel operation with these systems, notably radar
systems.
•
DFS with i-DFS: This method is similar to i-DFS. It differs in the event that
several alternative channels are equally the best within the 1 dB measurement
resolution. In i-DFS, the ODU selects the lowest channel number out of the set
of best channels. In DFS with i-DFS, the ODU monitors the interference level on
all the available channels and then randomly selects one channel from all that
are within 3dB of the lowest interference channel.
2-2
UNDER DEVELOPMENT
Chapter 2 Planning considerations
phn-0896_009v003
Feb 2010