Network Basics
7 Network Basics
This chapter gives you a short overview on the network basics. This chapter is meant to give you
some information about networking. When reading this chapter it's more easy to understand the
technical backgrounds of the network possibilities. In general we can divide the network possibilities of
the Oxygen 4 Digital in two types.
WAN – Wide Area Network
LAN – Local Area Network
The first, WAN, is mostly based in TCP/IP (also known from the internet). The second, LAN, is in our
application 10/100 Mbit Ethernet based.
7.1 Network Layers
In the network theory they often make use of layers to create a visualisation of a network connection.
This is called the OSI model (Open System Interconnect). It will be too much information at this point
to explain the complete OSI model. Below you will get some basic information regarding layers.
Figure 2: OSI Model
Physical & Data Link Layer
= Ethernet
Network Layer
= Internet Protocol or Cobranet
Transport Layer
= TCP or Cobranet
In higher layers we will find protocols like HTTP, FTP, SNMP etc….
Actually we are now looking at the protocol stack which contains the Ethernet protocol. TCP/IP
protocol, HTTP, FTP, Cobranet etc…
7.2 The Layer Implementation
For the Oxygen 4 Digital, we always use the Ethernet protocol for the Data Link & Physical layer. You
can imagine this Ethernet protocol as an envelope. The information on the envelope is Source
Address or Destination Address. The information inside this envelope represents the next layer. In this
layer you can find TCP/IP data from the Oxygen 4 Digital or Cobranet data from the Oxygen 4 Digital.
Figure 3: Network Implementation
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