Alcatel-Lucent OmniPCX Office Installation Manual page 187

8.1.20 U
UAI
Universal Alcatel Interface. Board used for connecting up digital terminals or DECT 4070 IO/EO base sta-
tions.
UPS
Uninterruptible Power Supply. Device increasing the system's backup time.
URL
Uniform Resource Locator. Address of a resource (file, program, image, etc.) accessible on the Internet.
UUS
User to User Signaling. Information carried clear end-to-end by ISDN to enable exchanges between net-
work subscribers; the ISVPN protocol is contained within this information.
8.1.21 V
VMU
Voice Mail Unit. The integrated voice server provides a voice mailbox for each user, as well as a general
voice mailbox and features such as Personal Assistant, Automatic Attendant and Audiotex.
VoIP
Voice over IP. Term designating voice transmission over a data network using the Internet protocol.
VoWLAN
Voice over WLAN. Term designating voice transmission over a data network using the WLAN.
VPN
Virtual Private Network. Private data network that uses the public telecommunications infrastructure (e.g.
the Internet) while maintaining confidentiality by means of tunneling protocols and security procedures.
8.1.22 W
WAN
Wide Area Network. A geographically dispersed telecommunications network. The term WAN is used in
contrast to LAN.
WBM
Web-Based Management. Management tools for the system's Internet features.
WINS
Windows Internet Naming Service. In Windows environment, the service that manages the correspondence
between client station names and LAN locations relative to their IP addresses.
WLAN
Wireless Local Area Network. A LAN that provides networking using radio frequencies rather than wires for
communication.
WLAN association
An association refers to the connection between the WLAN client and the AP. There are two types of asso-
ciations: passive scanning and active scanning. In passive scanning, APs send out information such as
SSIDs and supported rates, while the client passively scans the radio channels for beacons and probe re-
sponses. The client then selects an AP. The client keeps scanning even after the association is made (to
support roaming). In active scanning, clients send out probe requests. If the probe request contains an
SSID, only the APs with the correct SSID will respond. If the probe request contains a broadcast, all the
APs will respond.
WLAN client
Any PC, PDA, or phone set that supports the 802.11a and 802.11b/g protocols can be a WLAN client.
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