Motorola PTP 500 User's Guide download pdf (Page 91)

PTP 300 and PTP 500 Series User Guide Spectrum planning

phn-1115_006v000

Sep 2010

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• Fixed Frequency: In this mode, the unit must be configured with a single fixed

transmit frequency and a single fixed receive frequency. These may set to the

same value or to different values. This mode should only be considered in

exceptional circumstances, for example where it is known that are no sources of

interference on the selected channels.

Regions with mandatory radar detection

In regions that mandate DFS, the unit first ensures that there is no radar activity on a

given channel for a period of 60 seconds before radiating on that channel. Once a

channel has been selected for operation, the unit will continually monitor for radar

activity on the operating channel. If detected, it will immediately cease radiating and

attempt to find a new channel.

NOTE

The PTP 300 and PTP 500 fully conform to regional regulatory requirements

for radar avoidance.

In DFS regions, choose ‘DFS’ or ‘DFS with i-DFS’:

• Dynamic Frequency Selection (DFS): Once a channel is selected, the unit will

only attempt to find an alternative channel if radar activity has been detected on

the operating channel.

• DFS with i-DFS: In addition to switching channels on detection of radar, the unit

will also switch to a channel which has a significantly lower level of interference

than the current channel of operation. Before radiating on the newly selected

channel, the unit must again ensure that there is no radar activity on the new

channel for a period of 60 seconds. This mode therefore provides the benefit of

switching to a channel with lower interference but at the expense of an an outage

of approximately 60 to 120 seconds. For this reason, the threshold for switching

channels is greater than when i-DFS is operating in a non-radar region.

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Motorola PTP 500 User's Guide Page 91