Tsunami
®
800 & 8000 Series - Software Management Guide 107
5.4.4.1.2 DFS in SU or End Point B Mode
Explained below is the DFS functionality and the way it operates on an SU or a 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 will 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
j x k k {
k
.
5.4.4.2 Dynamic Channel Selection (DCS)
Dynamic Channel Selection feature enables you to monitor the link quality (retransmissions due to interference) on the
operating channel. If the link quality is found to be below the threshold, then the device stops transmitting on that channel
and switches to another channel, among the available channels.
Explained below is the DCS functionality and the way it operates on a BSU or in End Point A devices.
·
Enable DCS. By default, it is in disabled state.
·
When DCS is enabled, the device computes the percentage of retransmissions (due to interference) for each link:
: DCS is applicable to a BSU or End Point A only.
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