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`AX.25 Amateur Packet-Radio Link-Layer Protocol
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`Contents
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`2.3.4 Control Field Coding for Comands and Responses
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`2.3.4.1 Information Command Frame Control Field .
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`2.3.4.2 Supervisory Frame Control Field .
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`‘ 2.3.4.2.l Receive Ready (RR) Comand and
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`2.3.4.2.2 Receive Not Ready (RNR) Comand
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`2.3.4.2.3 Reject
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`2.3.4.3 Unnumbered Frame Control Fields .
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`2.3.4.3.1 Set Asynchronous Balanced Mode
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`2.3.4.3.2 Disconnect
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`2.3.4.3.3 Frame Reject
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`2.3.4.3.4 Unnumbered-Acknowledge (HA)
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`2.3.4.3.5 Disconnected Mode (DM) Response
`23.4.3.6 Unnumbered Information (UI) Frame
`2.3.5 Link Error Reporting and Recovery
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`2.3.5.1 DXE Busy Condition
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`2.3.5.2 Send Sequence Number Error
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`2.3.5.3 Reject (REJ) Recovery .
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`2.3.5.4 Time-out Error Recovery .
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`2.3.5.4.1 T1 Timer Recovery
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`2.3.5.4.2 Timer T3 Recovery
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`2.3.5.5 Invalid Frame or PCS Error
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`2.3.5.6 Frame Rejection Condition .
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`2.4 Description of AX.25 Procedures .
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`2.4.1 Address Field Operation
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`2.4.1.1 Address Information .
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`2.4.1.2 Comand/Response Procedure
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`2.4.2 P/F Bit Procedures .
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`2.4.3 Procedures For Link Set-Up and Disconnection .
`2.4.3.1 LAPB Link Connection Establishment
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`2.4.3.2 Information-Transfer Phase
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`2.4.3.3 Link Disconnection
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`2.4.3.4 Disconnected State
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`2.4.3.5 Collision Recovery
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`2.4.3.5.1 Collisions in a Half-Duplex
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`2.4.3.5.2 Collisions of Unnumbered Commands
`2.4;3.5.3 Collision of a DM with a SABM
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`2.4.3.6 Connectionless Operation
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`AX.25 Amateur Packet-Radio Link-Layer Protocol
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`Contents
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`2.4.4 Procedures for Information Transfer
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`2.4.4.1 Sending I Frames
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`2.4.4.2 Receiving I Frames
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`2.4.4.3 Reception of Out of Sequence Frames .
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`2.4.4.4 Reception of Incorrect Frames
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`2.4.4.5 Receiving Acknowledgement
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`2.4.4.6 Receiving Reject
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`2.4.4.7 Receiving a RNR Frame .
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`2.4.4.8 Sending a Busy Indication .
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`2.4.4.9 Waiting Acknowledgement
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`2.4.5 Frame Rejection Conditions .
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`2.4.6 Resetting Procedure
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`2.4.7 List of System Defined Parameters
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`2.4.7.1 Timers
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`2.4.7.1.1 Acknowledgement Timer T1 .
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`2.4.7.l.2 Response Delay Timer T2
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`2.4.7.2 Maximum Number of Retries (N2)
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`2.4.7.3 Maximum Number of Octets in an I Field (N1)
`2.4.7.4 Maximum Number of I Frames Outstanding (k)
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`Appendix A Glossary .
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`Appendix B References .
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`Implementation Ngtes .
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`Appendix D State Tables .
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