The Protocol : AX25

• The Frame identifiers:

C or SABM Layer 2 Connect Request

D or DISC Layer 2 Disconnect Request

I Information Frame

RR Receive Ready. System Ready To Receive

RNR or NR Receive Not Ready. TNC Buffer Full

RJ or REJ Reject Frame. Out of Sequence or Duplicate

FRMR Frame Reject. Fatal Error

UI Unnumbered Information Frame. "Unproto”

DM Disconnect Mode. System Busy or Disconnected.

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