User Manual

Table Of Contents
Chapter 4 - Operation and Administration
BreezeACCESS VL System Manual
148
NOTE
There is no aging time for SUs. An SU is only removed from the list of associated SUs under the
following conditions:
A SNAP frame is received from another AU indicating that the SU is now associated with the
other AU.
The SU failed to respond to 100 consecutive data frames transmitted by the AU and is
considered to have "aged out".
During the last 6 minutes (or more) the SU did not transmit any data frame, and failed to
respond to certain frames that typically are transmitted by the AU every 10 seconds. Since the
sampling interval for this state is about 10 minutes, it means that the decision to remove the SU
from the Associations Database will take place between 6 to 16 minutes from the time the SU
ceased sending data or responding to these “keep-alive” frames (for AUS the sampling interval
is 1 minute, meaning decision time of 6 to 7 minutes).
Therefore, the database of associated SUs may include units no longer associated with the AU. If
the number of associated SUs has reached the value of the Maximum Number of Associations
parameter, the selected AU cannot serve additional SUs. To view the current number of associated
SUs, use the Display Association Info option in the MAC Address Database menu. To delete
inactive SUs from the database you must either disassociate them (see 4.2.6.2.16) or reset the AU.
4.2.6.2.13 Wireless Link T ra p T hre shold (AU only)
The Wireless Link Trap Threshold parameter defines the threshold for the
wireless quality trap, indicating that the quality of the wireless link has dropped
below (on trap) or has increased above (off trap) the specified threshold.
The Wireless Link Trap Threshold is in percentage of retransmissions, and the
allowed range is from 1 to 100 (%).
The default is 30 (%).
4.2.6.2.14 Spectrum Analysis
Gaining knowledge of the noise characteristics per channel enables construction
of a relatively noise free working environment. In order to gain information
regarding noise characteristics in the location of the unit, the unit will enter
passive scanning mode for a definite period, during which information will be
gathered. The scanned channels will be all the frequencies included in the
selected sub-band.
Upon activating the spectrum analysis the unit will automatically reset. During
the information-gathering period the unit will not receive nor transmit data. It
also will not be able to synchronize/associate, meaning that it cannot be
managed via the wireless link. During the spectrum analysis period the unit
security mode is changed to promiscuous to enable gathering information
regarding all legal frames received by the unit. At the end of the period the unit
will reset automatically regaining normal operability upon start up.
The Spectrum Analysis submenu includes the following options: