ProSoft Technology RLX2-IHNF-WC - Manual (Page 123)

RLX2 Industrial Hotspot Series
ProSoft Technology, Inc. Page 123 of 212
June 15, 2015
RLX2-IHNF DFS Support
Some channels in the 5 GHz band are shared with radar and must adhere to Dynamic
Frequency Selection (DFS) rules. This means that if the radio detects the presence of
radar on its operating frequency, it must automatically change to another frequency.
Master Radio Operations
If radar is detected on an operating channel, transmissions must cease within the
required Channel Closing Transmission Time, and must move to a new channel within
the required Channel Move Time. Before transmitting on a new DFS channel that has
not been previously checked for radar, the Master radio must monitor the channel for
the Channel Availability Check Time before transmitting. Operations cannot return to a
channel where radar was detected for at least the Non-Occupancy Period. The values for
these parameters are noted in the table below:
Parameter FCC Value ETSI Value ETSI Value
5.600 – 5.650 GHz
(Channels 120, 124, & 128)
Channel Availability
Check Time 60 seconds 60 seconds 10 minutes
Channel Move Time 10 seconds (12 seconds
for “long pulse” radar 10 seconds 10 seconds
Channel Closing
Transmission Time 200 milliseconds (plus up
to 60 milliseconds over
10 seconds) 1 second 1 second
Non-Occupancy Period 30 minutes 30 minutes 30 minutes
If a Master radio detects radar, it issues a channel change announcement to all Clients
and Repeaters in the network. Then it moves to a new channel within the Channel Move
Time. (Typically, this move time is 500 milliseconds or less.) If the selected channel was
not previously checked for the presence of radar, the Master radio must do so for the
Channel Availability Check Time before it can begin to transmit. If the newly-selected
channel is not a DFS channel, or if the channel was previously monitored for radar since
the radio was powered on, transmissions can begin immediately.