Appendix A. NLI Messages
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## Appendix A. NLI Messages

Table A-1 lists the downstream messages and associated outgoing X.25 packets.

Table A-1. Downstream Messages and Associated Outgoing X.25 Packets

NLI Message | X.25 Packet
--- | ---
N_CI | Connect Request
N_CC | Connect Response
N_Data | Data
N_DAck | Data Acknowledgment
N_EData | Expedited Data
N_EAck | Expedited Data Acknowledgment
N_RI | Reset Request
N_RC | Reset Response
N_DI | Disconnect Request

Table A-2 lists the upstream messages and associated incoming X.25 packets.

Table A-2. Upstream Messages and Associated Incoming X.25 Packets

NLI Message | X.25 Packet
--- | ---
N_CI | Connect Indication
N_CC | Connect Confirmation
N_Data | Data
N_DAck | Data Acknowledgment
N_EData | Expedited Data
N_EAck | Expedited Data Acknowledgment
N_RI | Reset Indication
N_RC | Reset Confirmation
N_DI | Disconnect Indication
N_DC | Disconnect Confirmation

| Note: The NLI PVC messages PVC Attach and PVC Detach do not have corresponding X.25 packets.

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