X.25
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PHYSICAL LAYER
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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