Ethernet - . , Ethernet, 5 , , Ethernet - 50 .
Ethernet, . , Ethernet - , Ethernet Network, Xerox 1975 ( ). : 60- , Aloha. 1980 DEC, Intel Xerox Ethernet II , . Ethernet DIX .
Ethernet DIX IEEE 802.3, , . , IEEE 802.3 MAC LLC, Ethernet . Ethernet (Ethernet Configuration Test Protocol), IEEE 802.3. , .
IEEE 802.3 - 10Base-5, 10Base-2, 10Base-T, 10Base-F.
Ethernet .
Ethernet - CSMA/CD.
53. Frame Relay.
frame relay - , .25, , , , - .
frame relay , . frame relay . frame relay . 2 /.
frame relay - .
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frame relay ISDN .
frame relay - (PVC) (SVC). , , , , , , .
frame relay frame relay . , , . , , , , , .
frame relay
frame relay , , .25, frame relay ( ) , .25 3- .
, LAP-F frame relay - (core) (control). , frame relay, , . frame relay , , , .25. frame relay .
, , , .25.
(. 94) frame relay ISDN, frame relay ISDN, .
. 94. 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, .
ITU-T D . LAP-D, ISDN. Q.931 Q.933 ( Q.931 ISDN), ( .164 ISO 7498), , frame relay Data Link Connection Identifier - DLCI.
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frame relay LAP-D Q,931/933, LAP-F, . LAP-F core LAP-D, ITU-T - , LAP-D, LAP-F control.
- , frame relay , , IP, , . frame relay .
frame relay . frame relay , . , . frame relay , Ethernet, Token Ring FDDI, , .
LAP-F . 95.
. 95. LAP-F
(Data Link Connection Identifier, DLCI) 10 , 1024 . DLCI - 0 1 (Extended Address - ). , 0 , , 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 - -.
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