Alvarion BreezeACCESS VL 5.4 System Manual page 88

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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.
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 network
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, both the ESSID and Operator ESSID will be included by
the Beacon frames transmitted by it. 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. Once the SU has become
associated with a specific AU, its ESSID can be reconfigured to the value of
the ESSID of the AU.
ESSID
The ESSID parameter defines the ESSID of the unit.
Valid values: A string of up to 31 printable ASCII characters.
The default value is ESSID1.
NOTE:
The ESSID string is case-sensitive.
Operator ESSID Parameters (AU only)
The Operator ESSID Parameters submenu includes the following
parameters:
Operator ESSID Option
The Operator ESSID Option enables or disables the use of Operator ESSID
for establishing association with SUs.
The default is Enable.
BreezeACCESS VL System Manual