Alvarion BreezeACCESS 4900 Specifications Page 137

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Chapter 4 - Operation and Administration Menus and Parameters
BreezeACCESS 4900 111 System Manual
From Ethernet Only
From Both Ethernet and Wireless Link
The default for Access Units is From Ethernet Only. The default for Subscriber
Units is From Wireless Link Only.
4.2.6.1.5 Show IP Parameters
The Show IP Parameters option displays the current values of the IP parameters,
including the Run Time IP Address, Run Time Subnet Mask and Run Time
Default Gateway Address.
4.2.6.2 Air Interface Parameters
The Air Interface Parameters menu enables viewing the current Air Interface
parameters defined for the unit and configuring new values for each of the
relevant parameters.
4.2.6.2.1 ESSID Parameters
The ESSID (Extended Service Set ID) is a string used to identify a wireless network
and to prevent the unintentional merging of two wireless networks or two sectors
in the same network. Typically, a different ESSID is defined for each AU. To
facilitate easy addition of SUs to an existing network without a prior knowledge of
which specific AU will serve it, and to support the Best AU feature, a secondary
"global" ESSID, namely "Operator ESSID", can be configured in the AU. If the
Operator ESSID Option is enabled at the AU, the Beacon frames transmitted by it
will include both the ESSID and Operator ESSID. The SU shall regard such
frames if either the ESSID or the Operator ESSID matches it own ESSID. The
ESSID of the AU with which the SU is eventually associated is defined as the
Run-Time ESSID of the SU. Typically, the initial ESSID of the SU is configured to
the value of the Operator ESSID. When the SU has become associated with a
specific AU, its ESSID can be reconfigured to the value of the ESSID of the AU.
To support increased security the ESSID may be hidden. When this feature is
activated in AU 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 or the associated SUs.
The following frames will still contain the ESSID:
Probe Request - generated by SUs when active scanning is used.
Probe Response -generated by the AU as a response when the AU receives a
Probe Request from an SU. This unicast frame is sent only to the SU that has
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