1、 KSKSKSKS SKSKSKS KSKSKS SKSKS KSKS SKS KS 2006 12 22 http:/www.kats.go.krKS X 3509 (LAN) X.25 KS X 3509： 2006 (2011 ) X 3509： 2006 : ( ) ( ) : (http:/www.standard.go.kr) ： ：1996 12 17 ：2006 12 22 ：2011 12 29 2011-0657 ： ： ( 02-509-72635) (http:/www.kats.go.kr). 10 5 , . ICS 35.100.30 KS (LAN) X.25
2、X 3509： 2006(2011 ) Information processing systems Data communications Use of the X.25 packet level protocol in local area networks 1. KS X 3508 KS X 4302 2, KS X 4302 3, KS X 4302 5 (LAN) X.25 (PLP) . 7. KS X 4302 2 (LLC) 2 X.25/PLP , 9. KS X 4302 2 (LLC) 1 X.25/PLP . 2. . . KS X 3002 KS X 3503 KS
3、X 3508 DTE X.25 KS X 4302 2 (LAN) 2： KS X 4302 3 (LAN/MAM) 3： CSMA/CD KS X 4302 5 (LAN/MAM) 5： ISO 8348/Add.2： 1988 X.25 1： (Information processing systems Data communications X.25 Packet level protocol for Data Terminal Equipmemt Addendum 1： Alternative logical channel number allocation) ISO 8878：
4、1987 OSI X.25 (Information processing systems Data communications Use of X.25 to provide the OSI connection mode network service) ISO/IEC TR 10029： 1989 X.25 (Information technology Telecommunications and information exchange between systems Operation of an X.25 interworking unit) 3. . 3.1 KS X 3002
5、 . a) OSI b) OSI 3.2 ISO 8348/Add.2 . a) X 3509： 2006 2 3.3 (LAN) KS X 4302 2, KS X 4302 3, KS X 4302 5 . a) (LAN) b) (LLC) c) (MAC) d) e) DSAP f) SSAP 3.4 X.25 KS X 3508 . a) b) c) d) e) f) g) h) i) 4. ITU T for Telecommunication Standardization Sector of the International Telecommunications Unions
6、 DCE Data Circuit terminating Equipment DTE Data Terminal Equipment HIC Highest Incoming Channel HOC Highest Outgoing Channel HTC Highest Two way Channel LAN Local Area Network LCN Logical Channel Number LIC Lowest Incoming Channel LLC Logical Link Control LOC Lowest Outgoing Channel LTC Lowest Two
7、way Channel MAC Medium Access Control NSAP Network Service Access Point PDU Protocol Data Unit PL Packet Level PLP Packet Level Protocol SNPA Subnetwork Point of Attachment XID Exchange Identification DSAP Destination Service Access Point X 3509： 2006 3 SSAP Source Service Access Point 5. LAN X.25 P
8、LP KS X 3508 (DTE to DTE) . LAN X.25 DSAP “111 1110” SSAP . , LAN DTE . LAN DTE/DTE ( , LAN ) PL . LAN DTE/DTE PL LAN MAC . DTE/DTE LAN MAC . 1 . 1 6. 6.1 LAN DTE/DTE , DTE . X.25 PLP LAN LAN . . LAN LAN DTE (KS X 3508 LIC, HIC, LTC, HTC, LOC, HOC) . DTE X.25 PL (LIC ) , (X.25 PL ) . KS X 3508 DTE .
9、 DTE . LCN DTE . , DTE (DTE Originated) , DTE (DTE Resource Constraint) (163) . DTE KS X 3508 DCE . X 3509： 2006 4 8. 11. DTE DCE . DTE ( , LIC ) . DTE , . LCN . 6.2 KS X 4302 2, KS X 4302 3, KS X 4302 5 X.25/PLP DTE DTE/DTE . a) b) c) d) e) f) g) h) i) j) k) l) m) n) o) p) e) g) LAN . X.25 PLP . ,
10、LAN . LAN . DTE . , , , . 6.3 KS X 3508 . , LAN KS X 3508 . MAC . 1. 7 . 2. LAN KS X 3508 . LAN X 3509： 2006 5 . 128 . . 7. 7.1 KS X 3508 . 1 LLC 2 X.25/PLP . 1 LAN X.25 PLP LLC 2 T20( ) 36 T21( ) 40 T22( ) 36 T23( T24( ) 12 T25( ) 40 T26( ) 36 T28( ) 60 1. ( KS X 3508 ). , MAC , KS X 3508 . , LAN .
11、 , . (KS X 3508 ) , T22 T25 . 2. LAN X.25 PLP . 7.2 , , KS X 3508 . 8. LAN LLC 2 LAN . 1. LLC 2 . 2. LAN . IPDU 7 (KS X 4302 2). LAN KS X 4302 2 . LLC 2 LAN DTE DTE KS X 3508 4.5 . , LAN DTE DCE . X 3509： 2006 6 . KS X 3508 . 9. LLC 1 X.25/PLP KS X 3508 , , , X.25/PLP X.25/PLP LLC 1 . LLC 1 . . a) L
12、AN b) LAN KS X 4302 2 XID c) LLC 2 . , , LLC 1 X.25/PLP . 10. 10.1 KS X 3508 . 2 LAN X.25 PLP . 2 LAN X.25 PLP LLC 1 T20( ) 1 T21( T22( ) 1 T23( T24( ) 1.5 T25( ) 2 T26( ) 1 T28( 1. ( KS X 3508 ). , MAC , KS X 3508 . , LAN . , . (KS X 3508 ) , T22 T25 . 2. LAN X.25 PLP . 10.2 , , KS X 3508 . 3 LAN X
13、25 PLP . X 3509： 2006 7 3 LAN X.25 PLP LLC 1 R20( ) 1 R22( ) 1R23( ) 1 R25( ) 0* R28( ) 1 *LLC 1 KS X 3508 R25 0 , (KS X 3508 ) R25 0 . (KS X 3508 11.2.1 (2) P(S) KS X 3508 11.3 (3) . 11. KS X 3508 4.5 DTE . KS X 3508 . LLC 1 . DTE LAN LAN . , . (CALL REQUEST) . KS X 3508 4.5 . 12. LLC 1 X.25 PLP .
14、 (RESTART REQUEST) . . 12.1 (broadcast) LAN MAC . LAN LAN DTE . 12.1 LAN . MAC ( DTE ) NSAP LAN LAN DTE NSAP ( DTE ) . DTE . PL MAC . 12.1.1 DTE / . DTE . a) b) (CLEAR INDICATION) c) (CALL CONNECTED INCOMING CALL) d) 12.1.1.2, 12.1.1.3 . NSAP ( DTE ) DTE CLEAR REQUEST X 3509： 2006 8 . 12.1.1.1 DTE T
15、21 , DTE DTE CLEAR REQUEST . DTE CLEAR REQUEST(p6) . CLEAR CONFIRMATION DTE READY(p1) . 12.1.1.2 DTE . CLEAR INDICATION DTE (INCOMING CALL) CALL CONNECTED . 12.1.1.3 DTE . DTE , . , KS X 3508 . DTE , ( ) . a) MAC b) MAC a) , DTE CLEAR CONFIRMATION . b) , MAC DTE CLEAR CONFIRMATION MAC . . DTE , ( )
16、 a) MAC b) MAC a) , DTE DTE DTE CLEAR REQUEST MAC . DTE . b) , DTE CLEAR REQUEST . DTE DTE CLEAR REQUEST (p6) . . 12.1.1.4 DTE KS X 3508 . 12.1.2 (INCOMING CALL) DTE , DTE MAC CLEAR REQUEST . DTE(DTE Originated) , (76) . DTE DTE CLEAR REQUEST(p6) , . LLC 1 X.25 PLP . 12.2 LAN X.25 DTE/DCE . DTE . L
17、AN LAN . . (1) DTE LAN . X 3509： 2006 9 , DTE DTE (r2) . SNPA LAN REQUEST CONFIRMATION . DTE , DTE . READY(p1) . 1. DTE RESTART CONFIRMATION MAC . , DTE . 2. RESTART REQUEST MAC . (2) DTE LAN . READY(p1) . DTE RESTART CONFIRMATION , . 13. 13.1 5., 6. 7. . 9. . LLC 1 LLC 1 ( ) . (LAN) X.25 153787 1 92 3(13) (02)26240114 (02)262401489 http:/ KSKSKSSKSKS KSKS SKS KSKS SKSKS KSKSKSKorean Agency for Technology and Standards http:/www.kats.go.kr KS X 3509： 2006 Information processing systems Data communicationsUse of the X.25 packet level protocol in local area networks ICS 35.100.30
