S -
RR " " (Receive Ready) (NR 1) . RR I -, . RR , .. . RR RNR, " " .
RNR " " (Recieve Not Ready) (, - .). , I -. NR (NR 1) .
REJ "" ( Reject) ( ) , NR. I - (NR 1) .
SREJ " (, ) " (Selective Reject) () NR. I - (NR 1) .
U-
:
SABM " " (Set Asynchronous Balanced Mode);
SABME " " (Set Asynchronous Balanced Mode Extended);
SNRM " " (Set Normal Response Mode);
SNRM " " (Set Normal Response Mode Extended);
SARM " " (Set Asynchronous Response Mode);
SARME " " (Set Asynchronous Response Mode Extended);
DISC "" (Disconnect) , , " ";
SIM " " (Set Initialisation Mode), , .. (). UA.
DM " " (Disconnect Mode) ‑ () , .
RIM " " (Request Initialisation Mode), RIM SIM .
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UP " " (Unnumbered Poll) ( ) () I -, .
UA " " (Unnumbered Acknowledgment) , U -.
RD " " (Request Disconnect) , .
RSET " " (Reset) " " () , I -.
FRMR, XID, TEST, UI 2.
2
U -
[1], U -, , 5 : , , , . . U - , . FRMR, XID, TEST, UI.
- FRMR (" " Frame Reject) , :
1. , .. (W).
2. , (X).
3. (Y).
4. NR. NR , I - (Z).
HDLC c FRMR . :
;
I -, ;
- ;
;
;
;
.
- FRMR .
