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Advanced Configuration
5.4.4.2 DFS in SU or End Point B Mode
Explained below is the DFS functionality and the way it operates on SU or End Point B.
1. When SU/End Point B has no WORP link, it scans continuously all the channels in the configured Frequency Domain
for the presence of BSU/End Point A. If suitable BSU/End Point A is found in any scanned channel, the SU or End Point
B tries to establish WORP link.
2. After selecting the suitable BSU/End Point A’s channel,
• If SU/End Point B DFS is disabled, then SU/End Point B tries to connect to BSU/End Point A.
• If SU/End Point B DFS is enabled, the SU/End Point B scans the selected channel for the presence of the RADAR for
a duration of the configured Channel Wait Time (by default configured to 60 seconds). During this time, if the
SU/End Point B detects radar, the channel is blacklisted and it starts scanning on non-blacklisted channels for a
BSU/End Point A as given in step 1. If no radar is detected, a connection will be established.
3. While WORP link is present, the SU/End Point B continuously monitors the current active channel for potential
interference from a RADAR source (this is referred to as in-service monitoring).
• If RADAR is detected, the SU/End Point B sends a message to the BSU or End Point A indicating the RADAR
detection on the active channel and blacklists that channel for Non Occupancy Period (NOP). The default NOP is
30 Minutes.
• On receiving the RADAR detection message from SU/End Point B, the BSU/ End Point A blacklists the active
channel and ACS starts scanning for an interference free channel.
: The BSU blacklist the channel only when the number of SUs reporting the RADAR equals or exceeds the
configured SUs Reporting RADAR parameter.
4. A blacklisted channel can be purged once the Non Occupancy Period (NOP) has elapsed.
:
• On the SU/End Point B, if the preferred channel is configured with a DFS channel then SU will scan all the channels even if
ACS is disabled.
• When a channel is blacklisted, all its sub-channels that are part of that channel bandwidth are also blacklisted.
For detailed information on DFS enabled countries, see Frequency Domains and Channels.
Tsunami® 8100 Series - Software Management Guide 60