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Equipment Description
33003405 07/2007 55
The following table describes the seven OSI layers (bottom-top):
Number Layer Data Description
Media Layers
1 Physical layer
Media, Signal, and Binary
Transmission
Bits Defines all electrical and physical specifications for the
devices.
2 Data link layer
MAC and LLC
Frames Provides the functional and procedural means to transfer
data between network entities and detect and correct
errors that may occur in the Physical layer.
3Network layer
Path Determination and IP
Packets Provides the functional and procedural means of
transferring variable length data sequences from a
source to a destination via one or more networks.
Host Layers
4 Transport layer
End-to-End Connections and
Reliability
Segments Provides transparent transfer of data between end users.
5 Session layer
Interhost Communication
Data Provides the mechanism for managing the dialog
between end-user application processes.
6 Presentation layer
Data Representation and
Encryption
Data Relieves the Application layer of concern regarding
syntactical differences in data representation within the
end-user systems.
7 Application layer
Network Process to
Application
Data Interfaces directly to and performs common application
services for the application processes.