Appendix C - Rlx2-Ihx 5 Ghz Radio Dfs Support; Dfs Radio Operations - ProSoft Technology RLX2-IHW-E User Manual

RLX2-IHx Series ♦ 802.11a, b, g, n
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9

Appendix C - RLX2-IHx 5 GHz Radio DFS Support

Some channels in the 5 GHz band are shared with radar and must adhere to Dynamic
Frequency Selection (DFS) rules. If the radio detects the presence of radar on its
operating frequency, it must automatically change to another frequency.
Note: This applies only to radios that can operate at frequencies in the 5 GHz band.
9.1

DFS 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 RLX2-IHx series 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
Channel Availability
Check Time
Channel Move Time
Channel Closing
Transmission Time
Non-Occupancy Period
If a Master radio detects radar, it issues a channel change announcement to all Client
and Repeater radios in the network. It then 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.
During the Channel Availability Check Time, a radio blinks all three amber Signal
Strength LEDS approximately once per second. If radar is detected on the new channel
during the Channel Availability Check Time, the Master radio selects another channel
and begins the process again.
ProSoft Technology, Inc.
FCC Value
60 seconds
10 seconds (12 seconds
for "long pulse" radar
200 milliseconds (plus
up to 60 milliseconds
over 10 seconds)
30 minutes
Appendix C - RLX2-IHx 5 GHz Radio DFS Support
ETSI Value ETSI Value
5.600 to 5.650 GHz
(Channels 120, 124, &
128)
60 seconds 10 minutes
10 seconds 10 seconds
1 second 1 second
30 minutes 30 minutes
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