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Glossary
Protocol
A protocol describes the agreements for communicating in a network. It contains rules
for opening, administering and closing a connection, as well as in relation to data for-
mats, time frames and possibly troubleshooting. Communication between two applica-
tions requires different protocols at various levels, for example the
TCP/IP
protocols for
the Internet.
PVC
Permanent Virtual Circuit
A permanent virtual circuit is a logical connection in an ATM network.
QoS
Quality of Service
QoS allows network traffic to be sorted according to priorities. When this parameter is
activated, Internet telephony is given priority over other data traffic. This is a precondi-
tion for problem-free calls.
Remote management
Remote management refers to the ability to manage a network from a network compo-
nent that is actually outside the local network (LAN).
Router
A router directs data packets from one local network (LAN) to another via the fastest
route. A router makes it possible to connect networks that have different network tech-
nologies. For example, it can link a local network with
Ethernet
technology to the
Inter-
net.
See also: Bridge, Switch, Hub,
Gateway
Server
A server makes a service available to other network components (Clients). The term
"server" is often used to refer to a computer or PC. However, it can also mean an appli-
cation that provides a particular service such as DNS, Web server, file server or print
server.
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 plus which transport and signal-
ling protocols are involved.
SIP proxy server
The SIP proxy server sets up the connection to the Internet for Internet telephony (VoIP)
for all connected
SIP
clients.
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