X.25

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X.25

Definition of X.25

PHYSICAL LAYER

X.21
X.21-bis
V.24

LINK LAYER

Link Access Protocol (LAP)
Link Access Protocol, Balanced mode (LAPB)
Link Access Procedure, D-channel (LAPD)
Logical Link Control (LLC)

PACKET LAYER

Virtual Circuits
Permanent Virtual Circuit
Datagrams
Fast Select
Other Services

OPERATION

Call Setup
Call Teardown

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X.25

PHYSICAL LAYER

LINK LAYER

PACKET LAYER

OPERATION

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