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Equipment Description
54
33003405 07/2007
OSI model The model divides the functions of a protocol into a series of layers known as a
’protocol stack’ (e.g., TCP/IP stack). Lower layers are implemented in hardware,
while higher layers are used in software. Each of the layers is a transport platform
for the next higher level and relies on the next lower level .
The following image is a graphic representation of the OSI layers:
Media Layers Host Layers
Data
Data
Data
Segments
Packets
Frames
Bits
Application
Network Process to Application
Presentation
Data Representation and Encryption
Session
Interhost Communication
Transport
End-to-End Connections and Reliability
Network
Path Determination and IP
Data Link
MAC and LLC
Physical
Media, Signal, and Binary Transmission
Data Layer