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Glossary
TCP is responsible for dividing data up into
packets for delivery and reassembling them
at the destination. IP is responsible for
delivering the packets from source to
destination. When TCP and IP are bundled
with higher-level applications such as HTTP,
FTP, Telnet, and so on, TCP/IP refers to this
whole suite of protocols.
TFTP – Trivial File Transfer Protocol
A TCP/IP protocol commonly used for
software downloads.
TKIP – Temporal Key Integrity Protocol
A protocol used for WPA data encryption. It
ensures that a unique master key is
generated for each packet, supports message
integrity and sequencing rules, and supports
re-keying mechanisms. TKIP avoids the
problems of WEP static keys by dynamically
changing data encryption keys.
UDP – User Datagram Protocol
A connection-less transport service that
dispenses with the reliability services
provided by TCP. UDP gives applications a
direct interface with IP and the ability to
address a particular application process
running on a host via a port number, without
setting up a connection session.
UPnP – Universal Plug and Play
A networking architecture that provides
compatibility among networking equipment,
software, or between equipment and
software.
UPnP IGD – UPnP Internet Gateway Device
A standard used by UPnP aware clients, such
as MSN Messenger, to work properly from
behind a NAT.
UMTS – Universal Mobile
Telecommunications Service
A 3G wireless system that delivers high-
bandwidth data and voice services to mobile
users. UMTS has an air interface based on
WCDMA and a core network based on the
General Packet Radio Service (GPRS).
URL – Uniform Resource Locator
The address of a resource on the Internet, for
example www.ericsson.com.
USB – Universal Serial Bus
An interface for connecting peripherals such
as storage devices and printers to a host.
WAN – Wide Area Network
A network of computers that covers a large
geographical distance. With respect to the
Ericsson W21, WAN refers to the Internet.
WCDMA – Wideband CDMA
The radio access technology for wideband
wireless access supporting 3G services. It
allows very high speed multimedia services
like wireless Internet access and
videoconferencing. WCDMA is also known as
CDMA DS (Direct Sequence).
WEP – Wired Equivalent Privacy
A method for data encryption on wireless
networks. Data is encrypted into blocks of
either 64 bits length or 128 bits length. The
encrypted data can only be sent and received
by users with access to a private encryption
key.
Wireless
A common term used to describe
telecommunications in which radio waves
(rather than some form of wire) carry the
signal over part or all of the communication
path.
WLAN – Wireless Local Area Network
A WLAN is a network in which a mobile user
can connect to a LAN through a wireless
(radio) connection. The IEEE 802.11 standard
specifies the technologies for Wireless LANs.
WPA – Wi-Fi Protected Access
An authentication and encryption standard for
wireless networks. WPA addresses the
security limitations of WEP, providing a
82 1/1551-CRH 102 167 Uen Rev E 2008-02-15