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Glossary
Network protocol
The network protocol is the standard via which different PCs exchange data in a net-
work. A connection can only be established between PCs in a network if they all use the
same protocol. The
TCP/IP
network protocol is the most extensive network protocol,
which is also used for connections to the Internet. This must be set up on each PC from
which a network connection is to be established.
Protocol
A protocol describes the agreements for communicating on a network. It contains rules
for opening, administering and closing a connection, as well as about data formats,
time frames and handling possible errors. Communications between two applications
require different protocols at various levels, e.g. the
TCP/IP
protocols for the Internet.
Provider
A provider (Internet Service Provider) offers access to the Internet for a fee.
QoS
Quality of Service. QoS allows network traffic to be sorted according to priorities. This
makes it possible to grant
Internet telephony (VoIP)
priority over other data traffic. This
is a precondition for problem-free calls.
RJ
Registered Jack. Standardised connection, also known as a modular jack.
Router
A router directs data packets from one local area network (LAN) to another via the fast-
est route. A router enables the connection between networks of different network tech-
nologies and this is performed on the basis of a common protocol. For example, it can
link a local network with WiMAX technology to the Internet.
RSSI
Received Signal Strength Indication. Characteristic value for the signal strength of radio
connections, used by communication devices for the automatic selection of a suitable
channel.
Server
A server makes services available to other network components (clients). The term
"server" is often used to refer to a PC. However it can also mean an application that pro-
vides a particular service such as DNS,
DHCP
or a Web service.
SIP
Session Initiation Protocol. SIP is a standard for data transfer in Internet telephony
(VoIP). It describes how a call is carried over the data network and which components,
which transport and signalling protocols are involved.
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