Specifications

Chapter 4 - Operation Menus and Parameters
BreezeNET B 103 System Manual
While associated, the RB also performs In-Service Monitoring, meaning that it
periodically scans the operating channel for radar signals. If radar is detected, it
will notify the BU and stop transmitting on the respective frequency.
ETSI requirements enforce particular implementations for the DFS functionality
on RBs. Implementations of DFS on the RB for ETSI 5.8 and ETSI 5.4 based
country codes are compared in Table 4-6.
4.2.6.2.3.2.3 Channel shutdown
Before ceasing transmission on the frequency where radar signals had been
detected, the BU sends a special disassociation message to its associated RB. This
message includes an indication whether the RB should wait for this BU. If the RB
should wait, the message includes also the waiting time. During this time each RB
searches for the BU in the defined frequencies subset. If the BU was not found
within the waiting time, or if a waiting request was not included in the message,
the RB starts searching for any BU, using the Best BU mechanism if applicable.
Typically, operators prefer to preserve the original frequency planning and to
avoid moving to a new channel unless they are sure that there is a continuous
radar activity in the original channel. It should be noted that detection of radar
activity does not necessarily indicate a continuous radar activity in the channel. A
Table 4-6: DFS behavior on RBs using ETSI based country codes
Feature ETSI 5.8 based country codes ETSI 5.4 based country codes
Applicable country
codes
 ETSI 5.8
 Other country codes based on ETSI 5.8
(UK 5.8, Germany 5.8 and Universal
5.8 with Detection Algorithm set to
ETSI)
 ETSI 5.4
 Other country codes based on ETSI 5.4
(ETSI F 5.4 and Universal 5.4 with
Detection Algorithm set to ETSI)
Startup RB checks each frequencyand tags it as
either Radar Free or Radar Detected.
All frequencies are tagged as Radar Free
by default
Operating Frequency RB performs In-Service Monitoring and
dissasociates when radar is detected.
RB performs In-Service Monitoring and
dissasociates when radar is detected.
Radar Detected or
Adjacent to Radar
frequency
Expires after a predefined Channel
Avoidance Period. The frequency’s status
is then set to Radar Free, but the RB needs
to check for radar before using it to
associate.
Expires after a predefined Channel
Avoidance Period. The frequency’s status
is then set to Radar Free, but the RB needs
to check for radar before using it to
associate.
Radar Free frequency Expires. Afterward, the frequency is still
tagged as Radar Free, but the RB needs to
check for radar before using it to associate.
No revalidation required. The RB may use
the frequency to associate at any time.