1、KS X ISO/IEC 95481 KSKSKSKS SKSKSKS KSKSKS SKSKS KSKS SKS KS 1： KS X ISO/IEC 95481 ：2007 (2012 ) 2007 10 31 http:/www.kats.go.krKS X ISO/IEC 95481：2007 : ( ) ( ) SJ ( ) : (http:/www.standard.go.kr) ： ：2002 8 29 ：2007 10 31 ：2012 12 28 ： 2012-0832 ： ( 02-509-7262) (http:/www.kats.go.kr). 10 5 , . KS
2、X ISO/IEC 95481：2007 (2012 ) 1： Information technologyOpen Systems Interconnection Connectionless Session protocolPart 1：Protocol specification 1996 1 ISO/IEC 95481, Information technologyOpen Systems InterconnectionConnectionless Session protocol：Protocol Specification , . 1 1 . a) b) c) d) . e) f)
3、 (primitives) g) . ITUT X.225 ISO/ IEC 83271 . 2 . ( ) . ( ) ( .) . KS X ISO/IEC 95481：2007 2 2.1 | KS X 3701：2007, ITUT Recommendation X.214(1995) | ISO/IEC 8072：1996, Information technologyOpen Systems InterconnectionTransport service definition KS X 3901：2003, ITUT Recommendation X.215(1995) | IS
4、O/IEC 8326：1996, Information technologyOpen Systems InterconnectionSession service definition KS X 3902：2003, ITU T Recommendation X.225(1995) | ISO/IEC 83271：1996, Information technologyOpen Systems InterconnectionConnection-oriented Session Protocol：Protocol specification KS X ISO 74981：2007, 1： I
5、TU T Recommendation X.200(1994) | ISO/IEC 74981：1994, Information technologyOpen Systems InterconnectionBasic Reference Model：The basic Model . 3 3.1 KS X ISO 74981 | ITUT X.200 | ISO/IEC 74981 . a) (Transport Layer) b) (Session Layer) c) (session service access point) d) (session service access poi
6、nt address) e) (session entity) f) (protocol) g) (service) 3.2 . 3.2.1 (calling session address) . 3.2.2 (called session address) . 4 . 4.1 SPDU (Session Protocol Data Unit) KS X ISO/IEC 95481：2007 3 SDU (Service Data Unit) TSDU (Transport Service Data Unit) 4.2 UD SPDU (Unit Data SPDU) 4.3 SI (SPDU
7、 Identifier) LI (Length Indicator) PI (Parameter Indicator) PV (Parameter Value) 4.4 (calling session selector) (called session selector) 4.5 SPM (Session Protocol Machine) SS (Session Service) SS-user (Session Service User) SSAP (Session Service Access Point) TSAP (Transport Service Access Point) 5
8、 5.1 . KS X 3901 | ITUT X.215 | ISO/IEC 8326 . 1 . 1 (primitive) (parameter) (S-UNIT-DATA request) (SS-User-Data) (S-UNIT-DATA indication) (SS-User-Data) 5.2 KS X 3701 | ITUT X.214 | ISO/IEC 8072 KS X ISO/IEC 95481：2007 4 . , 2 . 2 (primitive) (parameter) (T-UNIT-DATA request) (source) (TS-User-Data
9、) (T-UNIT-DATA indication) (TS-User-Data) . 5.3 . a) (map) b) c) d) SSDU 5.4 (SPMs) . . SSAP (SS) (KS X 3901 | ITUT X.215 | ISO/IEC 8326 ). SPDU SPDU . . 6.2 . 1 . 1 KS X ISO/IEC 95481：2007 5 2 6 (mechanisms) . 6.1 (SPDU) 6.1.1 . 6.1.2 . T-UNIT-DATA request T-UNIT-DATA indication 6.1.3 SPDU SPDU . S
10、PDU UNITDATA UD 6.2 6.2.1 (SS) (SS) SSDU . 6.2.2 T-UNIT-DATA request T-UNIT-DATA indication 6.2.3 SPDU UD SPDU 6.2.4 UD SPDU S-UNIT-DATA (source) , , . KS X ISO/IEC 95481：2007 6 SPDU TSDU , S-UNIT-DATA SS . UD SPDU S-UNITDATA SS , . UD SPDU SPM . T-UNIT-DATA (source) , UD SPDU TS (issue). 6.2.5 UD S
11、PDU UD SPDUT-UNIT-DATA indication TS . UD SPDU SPM , UD SPDU S-UNIT- DATA indication . S-UNIT- DATA indication . T-UNIT-DATA indication (source) UD SPDU S-UNIT-DATA indication . T-UNIT-DATA indication UD SPDU S-UNIT-DATA indication . UD SPDU S-UNIT-DATA indication . , , SS , . 7 (UD) SPDU 7.1 TSDU U
12、D SPDU TSDU , 1 . SPDU 8 1 8 (bit) , 1 . 7.3 SPDU SPDU , 2 16 1 . TSDU a) SPDU . b) TSDU SPDU (, ). 1 TSDU 2 . KS X ISO/IEC 95481：2007 7 . TSDU . 2 SPDU , . a) . b) 8 1 . 7.2 SPDU SPDU SPDU . 3 . SPDU 7.3 . SPDU 4 . 7.2.1 SPDU SPDU . a) SPDU SI b) 3) LI c) , SPDU PI (7.2.2 ) 2 TSDU 3 SPDU PI 4 SPDU
13、KS X ISO/IEC 95481：2007 8 d) SPDU 7.2.2 PI PI . a) PI b) 7.2.3 LI c) , 7.2.3 LI , . 1) 0(zero) . 0254 LI . 25565555 LI 3 . 11111111 , . LI . 7.2.4 3 (mandatory) PI . 3 (non-mandatory) PI ( ) . PI 0(zero) LI , 1) , ( ) . PI PI . 7.3 PI PI . PI 3 10 , . 7.2.5 SSDU SPDU . SSDU SPDU . 7.3 SPDU 7.3.1 (UD
14、) SPDU 1) PI LI SPDU . KS X ISO/IEC 95481：2007 9 7.3.1.1 SI 64 . 7.3.1.2 3 . 7.3.1.3 PV , 1 1 , . . PI PV , (default) 1 . 7.3.1.4 , SS . 7.3.1.5 , SS . 7.3.1.6 SS . TSDU (KS X 3701 | ITUT Rec. X.214 | ISO/IEC 8072 ) UD (header) . 3 UNIT DATA SPDU PI m/nm PV nm 22 1 7.3.1.3 nm 51 16 7.3.1.4 nm 52 16
15、7.3.1.5 7.3.1.6 7.3.1.6 m (7.2.4) nm (7.2.4) 8 6 . KS X ISO/IEC 95481：2007 10 A () . A.1 . A.2 . A.3 . , . A.1 S-UNIT-DATAreq UD SS SPDU S-UNIT-DATA SPDU A.2 S-UNIT-DATAind UD SS SPDU S-UNIT-DATA ：T-UNIT-DATA TS A.3 (idle) S-UNIT-DATAreq UD UD S-UNIT-DATAind 1： 153787 1 145 3(16) (02)26240114 (02)26240148 http:/ KS X ISO/IEC 95481 ：2007KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Information technology Open Systems Interconnection Connectionless Session protocol Part 1 ：Protocol specification ICS 35.100.50 Korean Agency for Technology and Standards http:/www.kats.go.kr
