Siemens SCALANCE W1750D CLI - Page 753

Appendix A
A.1 Glossary of Terms
SCALANCE W1750D CLI
Function Manual, 03/2019, C79000-G8976-C452-04
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UHF
Ultra high frequency. UHF refers to radio frequencies between the range of
300 MHz and 3 GHz. UHF is also known as the decimeter band as the wave-
lengths range from one meter to one decimeter.
UI
User Interface.
UMTS
Universal Mobile Telecommunication System. UMTS is a third generation
mobile cellular system for networks. See 3G.
UPnP
Universal Plug and Play. UPnp is a set of networking protocols that permits
networked devices, such as personal computers, printers, Internet
gateways,
Wi-
Fi APs, and mobile devices to seamlessly discover each other's presence
on the network and establish functional network services for data sharing,
communications, and entertainment.
URI
Uniform Resource Identifier. URI identifies the name and the location of a
resource in a uniform format.
URL
Uniform Resource Locator. URL is a global address used for locating web
resources on the Internet.
USB
Universal Serial Bus. USB is a connection standard that offers a common
interface for communication between the external devices and a computer.
USB is the most common port used in the client devices.
UTC
Coordinated Universal Time. UTC is the primary time standard by which the
world regulates clocks and time.
UWB
Ultra-Wideband. UWB is a wireless
technology for transmitting large amounts
of digital data over a wide spectrum of frequency bands with very low power
for a short distance.
VA
Virtual Appliance. VA is a pre-configured virtual machine image, ready to run
on a hypervisor.
VBR
Virtual Beacon Report. VBR displays a report with the MAC address details
and RSSI information of an AP.
VHT
Very High Throughput. IEEE 802.11ac is an emerging VHT WLAN standard
that could achieve physical data rates of close to 7 Gbps for the 5 GHz band.
VIA
Virtual Intranet Access. VIA provides secure remote network connectivity for
Android, Apple iOS, Mac OS X, and Windows mobile devices and laptops. It
automatically scans and selects the best secure connection to the corporate
network.
VLAN
Virtual Local A
rea Network. In computer networking, a single Layer 2 network
may be partitioned to create multiple distinct broadcast domains, which are
mutually isolated so that packets can only pass between them through one or
more routers; such a domain is referred to as a Virtual Local Area Network,
Virtual LAN, or VLAN.
VM
Virtual Machine. A VM is an emulation of a computer system. VMs are based
on computer architectures and provide functionality of a physical computer.
VoIP
Voice over IP. VoIP allows transmission
of voice and multimedia content over
an IP network.
VoWLAN
Voice over WLAN. VoWLAN is a method of routing telephone calls for mobile
users over the Internet using the technology specified in IEEE 802.11b. Rout-
ing mobile calls over the Internet makes them free, or at least much less ex-
pensive than they would be otherwise.