Technical data

34 Theoretical and general applications www.westermo.com
The quality of a network depends, among others on:
… Speed, which in turn depends on the number of simultaneous users, media,
hardware and software.
… How the transmission takes place, whether it reaches the right receiver and
only the right receiver.
… The quality of the data, minimization of communication disturbances.
… Speed of the network.
… Reliability, how well the network is protected against transients, earth currents
and other phenomenon that can disturb communications.
… Security – How secure is the network against attack and viruses.
The need to be able to link different local networks has constantly increased, so that
data can be transferred between companies or within a company, nationally or inter-
nationally. How do the different computer systems and databases in a company com-
municate when they are spread across the world? The options are numerous:
… LAN (Local Area Netwok) fast network for local communication, for example,
Ethernet.
… MAN (Metropolitan Area Network) fast network that covers a greater geo-
graphical area.
…WAN(Wide Area Network) a network with a very large geographical
distribution, it may be a country or even the whole world.
…VAN(Value Added Network) is a network that offers more developed
services than just data communication.
… GAN (Global Area Network) is a network consisting of several local networks
that can be interconnected via MAN and fast WAN.
… AAN (All Area Network) a network that can be used in both local and more
geographically widespread networks.
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