Network Basics; Network Layers; The Layer Implementation; Figure 2: Osi Model - D&R Lyra User Manual

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 Lyra 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.
Physical & Data Link Layer
Network Layer
Transport Layer
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 Lyra, 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 Lyra or Cobranet data from the Lyra.
Lyra Digital Mixer from D&R Phone +31 294 418014, email:

Figure 2: OSI Model

= Ethernet
= Internet Protocol or Cobranet
= TCP or Cobranet

Figure 3: Network Implementation

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