User manual

Chapter 2 - Managing a Single Device/Cell Air Interface General Page
AlvariCRAFT Device Manager 40 User Manual
When the SU/RB has become associated with a specific AU/BU, its ESSID can be
reconfigured to the value of the ESSID of the AU/BU.
To support increased security the ESSID may be hidden. When this feature is
activated in AU/BU it will not broadcast the ESSID in Beacon frames (null
characters will be transmitted instead of the ESSID). The ESSID will not be
transmitted also in Distance messages transmitted by either the AU/BU or the
associated SUs/RB.
The impact of the Hidden ESSID feature on the operation of SU/RB is as follows:
 If the Hidden ESSID Support parameter in the SU/RB is set to Disable, the
SU/RB will not try to Associate with an AU/BU that is working with Hidden
ESSID Enabled
 If the Hidden ESSID Support parameter in the SU/RB is set to Enable the
SU/RB will try to Associate with an AU/BU that is working with Hidden
ESSID. The SU/RB will send the Association Request that will contain the
ESSID of the SU/RB; the AU/BU will check the SU/RB's ESSID versus its own
ESSID and if there is a match the AU/BU will associate the SU/RB. If the
SU/RB uses a different ESSID the AU/BU will reject it and the Association
Response will include the reason for rejection. The SU/RB will add this AU/BU
to a table that contains the AUs/BUs that rejected it because of wrong ESSID
and it will not try again to associate with this AU/BU until the Hidden ESSID
Time-out expires.
 If Hidden ESSID Support parameter in the SU/RB is set to Enable and the
SU/RB finds an AU/BU that is not working with Hidden ESSID the SU/RB
will try to associate with this AU/BU only if the AUs/BUs ESSID or Operator
ESSID is the same as the SU's/RB’s ESSID.
The impact of the Hidden ESSID feature on the operation of AU/BU is as follows:
 When the AU/BU receives Probe Request form an SU/RB it will check if the
ESSID in the Probe Request is that same as its own ESSID. It will generate the
Probe Response only if there is a match.
 The Authentication process is not affected by the Hidden ESSID feature.
 When the AU/BU receives an Association Request and the ESSID included in
the frame matches its own ESSID the AU/BU sends the Association Response
with Status Code OK - meaning that the SU/RB is associated. If there is no
match the AU/BU sends the Association Response with Status code Rejected -