Technical data

36 Theoretical and general applications www.westermo.com

Bus network

In principle a bus network consists of a main line where all units are connected as

nodes. All data traffic is sent out via the bus to the receiver. A bus network must have

regulations for how a transmitting device checks whether the line is free and how it

should act in the event of a transmission colliding with other data traffic, for example

through delayed retransmission. The bus network is easy to install,

expand and extend. Ethernet and AppleTalk are common examples of a

bus network. Among the disadvantages is slow traffic when many

devices need to communicate on the network. However, the bus net-

work can be divided up into several short buses, which segment the

network.

Combined network

Using different communication products means that you can create your own cus-

tomised network solution that combines the advantages of the different

topologies, including performance and reliability. For example, a bus net-

work with a distributed star, which is a way to link together several star

networks. It is important to remember that each network needs to have

a fully working regulation system, traffic regulations, for data communica-

tions.

Mesh network

Networks that are interconnected without a structure are known as a mesh network.

In a poorly documented network without structure the risk of communication errors

created by mistake is considerable. Suppose you connect in another node and in doing

so create a loop, a broadcast will then circulate in the network, further

broadcasts add traffic and in the end you have a broadcast storm in your

network.

Node Node

Node

Node Node

Node

B A C K