Technical Terms
192
Subnet
A network can be divided into several subnets. For
example, it is possible to use the IP address
192.177.65.xxx to address all computers, which have
the number 192.177.65. in common and which only
differ from one another in terms of the last three
digits (xxx). The subnet mask indicates which
positions should be used for differentiation within
the subnet. In a subnet, two subscribers communi-
cate directly with each other. The IP packets only
have to pass through the router if subscribers
communicate outside of the subnet.
Switch
A Switch is an active hub, which functions as a kind
of exchange. In contrast to the hub, the switch does
not forward the incoming data packets to all lines,
but rather only to that line which leads to the desti-
nation of the packet.
TA
Terminal Adapter
TAPI
Terminal Application Programming Interface
Interface for programming terminal applications
TE mode
Terminal Endpoint
see
TEI
Terminal Endpoint Identifier
With the help of the TEI, different terminals are
addressed to an ISDN bus on Layer 2.
TCP/IP
Transmission Control Protocol / Internet Protocol
Two commonly used protocols for the transfer of
data and for Internet connection, which can be
implemented on different types of transport media.
TSP
TAPI Service Provider, driver for TAPI devices
Unified
Messaging
Message management system developed in 1989. It
denotes a method of bringing incoming and outgo-
ing messages of any kind (e.g. voicemail, email, fax,
SMS, MMS, etc) into a standardized form, and grant-
ing the user access to this via a wide range of clients
(fixed network or mobile phone, email client).
Term
Explanation
USB
Universal Serial Bus. Bus system for connecting a
computer to ancillary equipment. A USB port takes
little space, and can supply power to simple devices
such as a mouse, a phone or a keyboard. Devices
equipped with USB can be connected to each other
during active operation (hot plugging), and their
properties can be detected automatically.
VLAN
Virtual LAN. Virtual local network within a physical
network. A widespread technical implementation of
VLANs is partially defined in the standard IEEE
802.1Q.
VoIP
Voice over IP
Collective term for all techniques for transmitting
voice over IP networks.
WAP
Wireless Application Protocol. The Wireless Applica-
tion Protocol denotes a collection of technologies
and protocols, whose aim is to make Internet
content available for the slower transmission rates
and the longer response times in mobile radio, as
well as for the small displays of mobile telephones.
WAP is thus in direct competition with the i-mode
services.
WAV
A file format used for recording voice or music, for
example, announcement texts, music on hold, or
Voicemail. 16KB of memory are required for each
recorded second.
Term
Explanation