IFU, (NLR), IS , OSI, ES, . , ISO 7498 8648.
CLNP (PSN) X.25, , , (SNDCF), ISO 8473.
NLR SMN DCN, CLNP Class 4 (4). SMS - DCN , .25, ( DCN CONP) IFU OS. IFU PDU (NPDU), SMN, CLNP NPDU SMS SVC X.25 DCN.
, TMN, Q - ( ) TMN. O , .
Q-
Q- (. G.771) : BI, B2, , . G.773. : - 1, 2 - CONS1, CLNS1, CLNS2 ( Bl, B2, ), . G.773 (1993.).
. CONS1, CLNS1 CLNS2 1-3 OSI . Q.811, 4-7 - . Q.812. Q3, Qx ( OSI).
1 2 .11-2.
11-2. 1 2
1 | 2 | |
1 | ISO 8482, EIA 485 | |
2 | ISO 3309, ISO 4335, ISO 7809 | ISO 8802-2 + DAD2, ISO 8802-3 |
3 | ISO 8473, ISO 8473/AD3 | ISO 8473 |
7 | ACSE - X.217, X.227, ASE | ROSE - .219, .229; CMSE - ISO 9595, ISO 9596 |
4-6 OSI .
, Qx, . 1 19,2 64 /, .. 128 /. 2 1 / .
.11-10 DCN (. Q.811), Q3, - , , : - , , - .
|
|
.11-10. DCN
, ga ( CLNS X.25) , CLNS/X.25 ( g .25, CLNS) DCN ga ag ag, PSPDN ( - (PSPDN), CONS). :
- OS, MD, QA NE ( . 11 -10 );
- IWU;
- 1 ( 1) - , , ES;
- 2 ( 2) - , , .. ES.
DCN : (CLM) - CLNS, () - CONS. OSI:
CONS1 - , .25 , PSPDN OS/MD/QA/NE;
CONS2 - , .31 D- ISDN, ISDN OS/MD/QA/NE;
CONS3 - , .31 - ISDN, ISDN OS/MD/QA/NE;
CONS5 - , SS#7 (-7) SCCP ;
CONS6 - , .25 LAN, OS/MD/QA/NE, UN;
CLNS1 - , LAN (Ethernet) ISO 8802-2 CLM, LAN OS/MD/QA/NE;
CLNS2 - CLM, IP- .25 , PSPDN OS/MD/QA/NE.
, Q3, CLNS. CLNS1 1, 10 / . CLNS2 - : 1,2; 2,4; 4,8; 9,6; 19,2 64 / ( 48 56 /), /( CI.NSI : , . CI.NS2 , .21, X.21bis V.nn.