frame relay , , .25, frame relay ( ) , .25 3- .
, LAP-F frame relay - (core) (control). , frame relay, , . frame relay , , , .25. frame relay .
, , , .25.
(. 6.25) frame relay ISDN, frame relay ISDN, .
. 6.25. frame relay
LAP-F core, LAP-D. LAP-F ( Q.922 ITU-T) ISDN, 1/1. LAP-F , . PVC frame relay LAP-F core.
LAP-F contol LAP-F core, . LAP-F control frame switching.
ITU-T D . - LAP-D, ISDN. Q.931 Q.933 ( Q.931 ISDN), ( .164 ISO 7498), , frame relay Data Link Connection Identifier - DLCI.
frame relay LAP-D 0,931/933, LAP-F, , DLCI. LAP-F core LAP-D, ITU-T - , LAP-D, LAP-F control.
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- , frame relay , , IP, , . frame relay , , RFC 1490, frame relay SNA.
frame relay . frame relay , . , . frame relay , Ethernet, Token Ring FDDI, , .
LAP-F . 6.26.
. 6.26. LAP-F
HDLC, , .
(Data Link Connection Identifier, DLCI) 10 , 1024 . DLCI - 1 (Extended Address - ). , , , 1, 1 .
DLCI , DLCI 16 , - 23 .
frame relay (ANSI, ITU-T) DLCI :
0 - (LMI);
1 -15 - ;
16-991 - PVC SVC;
992-1007 - ;
1008-1022 - ;
1023 - .
, frame relay 976 DLCI.
4056 .
C/R HDLC - -.
DE, FECN BECN .
frame relay (QoS) . .