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Introduction
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ELSA LANCOM DSL/25 Office
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10
EN
1.1 What does a router do?
A router connects local networks (LANs) and individual PCs to form a Wide
Area Network (WAN). This allows any computer in this WAN to access the
computers and services on the entire network, depending on its access
privileges. The router does this by seeking out a path over which data can be
exchanged between the computers.
This is available in the form of an ATM connection, for example, that can be
realized via normal copper telephone lines with xDSL technology.
Connection to the Internet is a particularly widespread form of network
connection. If the local network in a company is connected with the network
of an Internet service provider, all computers in the LAN will be able to access
the services and sites on the World Wide Web.
But routers are capable of more. Using a special interface called the ELSA
LANCAPI, modern office communications functions such as fax or
EuroFileTransfer etc. can be provided on the entire local network. The
corresponding communications programs forward their data via the LANCAPI
to the router which then takes care of the data transmission. Equipping the
individual workstations with their own data communications equipmenta
costly, high-maintenance scenariothus becomes superfluous.
The router is incorporated into the network in the same way as any normal
PC. Any data traveling on the network cable, therefore, is seen by the router
too. It automatically determines whether or not the data needs to be
transmitted to another network. If necessary, it establishes the connection
to the destination network. Of course, a dedicated line does away with the
process of establishing a connection.
When precisely should the router be used?
As a matter of fact, wherever computers need to be joined together and a
simple modem operation no longer fits the bill. Here are some example
applications:
Internet on the LAN
Many companies are experiencing an increasing demand for Internet
access from all workstations on the LAN. Online research, file transfer
and e-mail are just some of the applications intended to lighten the
workload of those working at a PC.
The router links all the workstation computers on your local area network
to the global Internet. Security features such as IP masquerading not only
20659_DE_0300.book Seite 10 Mittwoch, 17. Mai 2000 9:19 09
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