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11 Glossary
UDP – User Datagram Protocol
Transport protocol for data traffic
between network-capable devices
(servers, computers, etc.) in IP-based
networks. Data transmission used
in almost all operating systems and
is part of the IP protocol for the
Internet. For data traffic, a connec-
tion is not necessary between the
devices. UDP is a limited-reliability,
insecure and unprotected transfer
protocol, as no mechanisms are
provided for this. In return, UDP uses
less transport management data
(overhead), thereby creating a lower
additional data volume and is char
-
acterised by a lower latency time. In
contrast to TCP, UDP has a reduced
range of functions:
• Transport service
• Multiplexing connections
• Error handling
• UDP is used in voice transmission,
as a low latency time is required.
UMTS – Universal Mobile
Telecommunications System
->
3G (UMTS)
Unicast
An information and communication
technology type of point-to-point
connection for sending data from
a sender to a recipient via an IP
address. Information is sent from the
source to the pre-defined recipient
on an individual basis. Standard
switches can be used for this type of
data transmission. Existing networks
without multicast ability do not have
to be upgraded. Access is unicast-
capable.
->
Multicast
VLAN – Virtual Local Area
Network
Closed subnetwork within IP-based
networks. A VLAN separates physical
IP-based networks into any number
of subnetworks. VLAN-capable
switches ensure that data packets
are only sent within this VLAN and
are not forwarded to another VLAN,
even though different VLANs can be
connected to a shared switch or via
several switches. Different methods
are available for setting up a VLAN:
• Port-based (old method)
• Static (old method)
• Tagged
• Dynamic
VoIP – Voice over IP
Network protocol for voice, data and
video transmission which is used for
IP/internet telephony and enables
telephony in IP-based stationary
and mobile networks. SIP, RTP and
UDP are used for VoIP, to name a
few. VoIP can only be used with
suitable end devices, adapters or
software clients. In addition, internal
or external VoIP provision (e.g. VoIP
provider) is required. Access provides
an optional internal VoIP provision.
WAN – Wide Area Network
Wide area network which is
designed for voice and/or data
transfer over large distances. A WAN
(e.g. Internet) covers a large distance
and can be used without restrictions
for business and private communica
-
tion. The term WAN serves to make
a distinction between the relevant
network sizes. The term WAN is
used to make a relative classification/
distinction between cross region
and/or public IP-based networks and
other networks.
->
LAN, WLAN
