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2 Local Area Networks
2.1.1 The ISO seven layer model
Layer
Designation
Application
7
Layer
Appli-
cation-
Presentation
oriented
6
Layer
layer
5
Session
Layer
Transport
4
Layer
CP
Network
3
Layer
Transport-
oriented
layer
Data Link
2
Layer
Physical
1
Layer
Protocol architecture for local area networks according to ISO
2–4
Function
Application functions
(Information processing
Data representation
language
Communication control
Synchronization
Transport control
Flow control
Blocking
Acknowledgement
Connection establishment/release
Network connections
Addressing of other
networks
Reliable transfer
Allocation method
Physical characteristics of
the transmission path
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Example
•
File transfer
•
)
Remote
Control
•
Common
•
Coordination
(open,
end, abort)
•
Transmission of
conversation text
X.25
CRC check
CSMA/CD
IEEE*
802.3
Yellow Cable
* Ethernet
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
08.89
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