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Page 136 / 148 Scroll up to view Page 131 - 135
136
Glossary
Mbps
Million bits per second
Specification of the transmission speed in a network.
MER
MAC Encapsulated Routing
MRU
Maximum Receive Unit
The MRU defines the maximum user data volume within a data packet.
MTU
Maximum Transmission Unit
The MTU defines the maximum length of a data packet that can carried over the net-
work at a time.
NAT
Network Address Translation
NAT is a method for converting IP addresses (mostly
Private IP addresses
) within a net-
work into one or several
Public IP addresses
on the
Internet
. With NAT several network
components in a
LAN
can share the router's public IP address to connect to the Internet.
The network components of the local network are hidden behind the router's IP address
registered on the Internet. Because of this security function NAT is frequently used as
part of the
Firewall
of a network. If you want to make services on a PC in the local net-
work available on the Internet despite NAT, you can configure the Gigaset SE551 WLAN
dsl/cable as a
Virtual server
.
Network
A network is a group of devices connected in wired or wireless mode so that they can
share resources such as data and peripherals. A general distinction is made between
local area networks (
LANs
) and wide-area networks (
WANs
).
Network adapter
The network adapter is the hardware device that creates the connection between a net-
work component and a local network. The connection can be wired or wireless. An Eth-
ernet network card is an example of a wired network adapter. The Gigaset PC Card 108
and the Gigaset USB Adapter 108 are examples of wireless network adapters.
A network adapter has a unique address, the
MAC address
.
Port
Data is exchanged between two applications in a network across a port.The port
number addresses an application within a network component. The combination of
IP
address
/port number uniquely identifies the recipient or sender of a data packet within
a network. Some applications (e.g. Internet services such as HTTP or FTP) work with
fixed port numbers, others are allocated a free port number whenever they need one.
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137
Glossary
Port Forwarding
In port forwarding the Gigaset SE551 WLAN dsl/cable directs data packets from the
Internet
that are addressed to a particular
Port
to the corresponding port of the appro-
priate network component. This enables servers within the local area network to offer
services on the Internet without them needing a
Public IP address
.
See also:
Virtual server
PPPoA
Point-to-Point Protocol over ATM
PPPoA is a
Protocol
for connecting network components in a local Ethernet network to
the
Internet
via an ATM network.
PPPoE
Point-to-Point Protocol over
Ethernet
PPPoE is a
Protocol
for connecting network components in a local Ethernet network to
the
Internet
via a modem.
Private IP address
The private
IP address
(also known as the local IP address) is a network component's
address within the local area network (
LAN
). The network operator can assign any
address he or she wants. Devices that act as a link from a local network, such as the
Gigaset SE551 WLAN dsl/cable, have a private and a
Public IP address
.
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
.
Public IP address
The public
IP address
(also known as the global IP address) is a network component's
address on the
Internet
. It is assigned by the
Internet Provider
. Devices that create a link
from a LAN to the Internet, such as the Gigaset SE551 WLAN dsl/cable, have a public and
a
Private IP address
.
Radio network
See
WLAN
Rekey Interval
The rekey interval is the period after which new keys are automatically generated for
data encryption with
WPA-PSK
.
Remote Management
Remote Management refers to the ability to manage a network from a network compo-
nent that is actually outside the local area network (
LAN
).
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138
Glossary
Repeater
A repeater extends the range of a wireless local area network by relaying data from the
Access Point
to additional PCs or
Network adapter
.
Roaming
Roaming extends the range of a wireless LAN by using several
Access Points
that use the
same
SSID
and the same radio channel and are linked via
Ethernet
. The PCs in the net-
work can switch dynamically between several Access Points without losing the existing
network connection.
Router
A router directs data packets from one local area network (
LAN
) to another via the fast-
est route. A router makes it possible to connect networks that have different network
technologies. For example, it can link a local network with
Ethernet
or
WLAN
technol-
ogy to the
Internet
.
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
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 plus which transport and signal-
ling protocols are involved.
SMTP
Simple Mail Transfer Protocol
The SMTP
Protocol
is part of the
TCP/IP
protocol family. It governs the exchange of elec-
tronic mail on the
Internet
. Your
Internet Provider
provides you with access to an SMTP
server.
SNMP
Simple Network Management Protocol
The SNMP
Protocol
is part of the
TCP/IP
protocol family. It provides a simple procedure
for administering the network based on a system of shared information for manage-
ment data and network management messages (known as traps) and reports the occur-
rence of events within the monitored network (e.g. an alarm message or notification of
configuration changes).
Page 139 / 148
139
Glossary
SSID
Service Set Identifier
The SSID is used to identify the stations in a wireless network (
WLAN
). All wireless net-
work components with the same SSID form a common network. The SSID can be
assigned by the network operator.
Static IP address
A static
IP address
is assigned to a network component manually during network con-
figuration. Unlike a
Dynamic IP address
, a static (fixed) IP address never changes.
Subnet
A subnet divides a network into smaller units.
Subnet mask
The subnet mask determines how parts of the
IP addresses
of a network represent the
network number and how many the computer number.
The subnet mask in a network administered by the Gigaset SE551 WLAN dsl/cable is
always 255.255.255.0. That means the first three parts of the IP address form the net-
work number and the final part is used for assigning computer numbers. The first three
parts of the IP address of all network components are in this case always the same.
Super G
Super G is an extension of
IEEE 802.11g
. Channel bundling doubles the maximum trans-
fer rate to 108 Mbps. Unlike other technologies (e.g. 125 Mbps technology) which work
by compressing data, here the transfer rate is actually doubled. If data is already com-
pressed (ZIP, RAR, MP3, MPEG etc.) data compression offers no significant improve-
ments.
Switch
A switch, like a
Hub
, is an element used to link different network segments or compo-
nents. Unlike a Hub however, the Switch has its own intelligence that enables it to for-
ward packets to only the subnet or network component they are meant for.
See also:
Bridge
,
Hub
,
Router
,
Gateway
TCP
Transmission Control Protocol
The TCP
Protocol
is part of the
TCP/IP
protocol family. TCP handles data transport
between communication partners (applications). TCP is a session-based transmission
protocol, i.e. it sets up, monitors and terminates a connection for transporting data.
See also
UDP
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140
Glossary
TCP/IP
Protocol
family on which the
Internet
is based.
IP
forms the basis for every computer-to-
computer connection.
TCP
provides applications with a reliable transmission link in the
form of a continuous data stream. TCP/IP is the basis on which services such as WWW,
Mail and News are built. There are other protocols as well.
UDP
User Datagram Protocol
UDP is a
Protocol
of the
TCP/IP
protocol family that handles data transport between com-
munication partners (applications). Unlike
TCP
, UDP is a non-session based protocol. It
does not establish a fixed connection. The data packets, so-called datagrams, are sent
as a
Broadcast
. The recipient is responsible for making sure the data is received. The
sender is not notified about whether it is received or not.
UPnP
Universal Plug and Play
UPnP technology is used for the spontaneous linking of home or small office networks.
Devices that support UPnP carry out their network configuration automatically once
they are connected to a network. They also provide their own services or use services of
other devices on the network automatically.
URL
Universal Resource Locator
Globally unique address of a Domain on the
Internet
.
Virtual server
A virtual
Server
provides a service on the
Internet
, that runs not on itself, but on another
network component. The Gigaset SE551 WLAN dsl/cable can be configured as a virtual
server. It will then direct incoming calls for a service via
Port Forwarding
directly to the
appropriate
Port
of the network component in question.
VoIP
Voice over IP
See
Internet telephony
WAN
Wide Area Network
A WAN is a network that is not restricted to one particular area, such as the
Internet
.
A WAN is run by one or more public providers to enable private access. You access the
Internet via an
Internet Provider
.

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