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Glossary
Gigaset SL75 WLAN / en / A31008-M700-B112-1-7619 / glossary.fm / 24.4.06
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Ping Test
Diagnostic tool in data networks. The
handset sends a query to a server/host
to check its availability.
Port
Data is exchanged between two appli-
cations in a
network
across a port.
Port Forwarding
The Internet gateway (e.g. your router)
forwards data packets from the
Inter-
net
that are directed to a certain
port
to the port concerned. This allows serv-
ers in the
LAN
to offer services on the
Internet without you needing a public
IP address.
Port Number
Indicates a specific application of a net-
work subscriber. Depending on the set-
ting in the
LAN
, the port number is per-
manently assigned or else it is newly
assigned with each access.
The combination of
IP address
/port
number identifies the recipient or
sender of a data packet within a net-
work.
PPPoATM (Point-to-Point Protocol over ATM)
Protocol for connecting network sub-
scribers within an
ATM
network to the
Internet via a modem.
PPPoE (Point-to-Point Protocol over Ethernet)
Protocol for connecting network sub-
scribers within an
Ethernet network
to
the Internet via a modem.
Pre-dialling
Preamble
Preamble type (short/long)
Private IP Address
Protocol
Describes the agreements for commu-
nicating within a
network
. It contains
rules for opening, administering and
closing a connection, about data for-
mats, time frames and possible error
handling.
Proxy/Proxy Server
Computer program that controls the
exchange of data between
client
and
server
in computer networks. If the
handset sends a query to the SIP server,
the proxy acts as a server towards the
handset and as a handset (client)
towards the server. A proxy is
addressed via the
IP address
/
domain
name
and
port
.
Public IP address
The public IP address is the address for
a network component on the Internet.
It is assigned by the Internet Service
Provider. Devices that act as a link from
a local network to the Internet (gate-
way, router) have a public and a local IP
address.
See also IP Address.
Q
Quality of Service
Describes the Quality of Service in com-
munication networks. Differentiations
are made between various Quality of
Service classes.
QoS influences the flow of data packets
on the Internet e.g. by prioritising data
packets, bandwidth reservation and
packet optimisation.
In VoIP networks, QoS influences the
voice quality. If the whole infrastruc-
ture (router, network server etc.) has
QoS, the voice quality is better, i.e.
fewer delays, less echoing, less crack-
ling.
