PAD. , .28. PAD ( ), PAD. .. :
* , ; PAD; .
PAD
- PAD 5, . , . .
PAD , , , , - MAP.
.29
1977, 1980-1993 ., 1997 . PAD DTE PAD- .3,.25.28.
. .29 :
- PAD;
- ;
- PAD.
PAD .25 X.25/PAD, .25 (. .4-10) PAD.
.25 PAD
.25 PAD .4-7.
(.4-7) - DTE-X.25-DTI- PAD .25. (.4-7) - PAD-a .25. - PAD-a, , - PAD - .25.
.25 ( ) .25, PAD - .. DTE PAD, , , .28, PAD - .29. .25 DTE (.4-7) PAD-a , .25 (.4-7) .25.
PAD- (.4-7) , PAD ( ) : - MLP.
.25
.25 , , .. - ( -), .121 - - (PDN). , , .
|
|
.121
.121 1984 . 14 () , -
3-4 :
D + NI + NTN + SA DNIC + NTN + SA,
DCC - , : 3 : , , .25 (1), DCC (2-8), (9-10);
NI - (1 ), .. DCC 10 (0-9) ;
DNIC - , DCC + Nl; NTN - ( 8 );
NTN+SA - , .. 10 . SA - ( );
2000 . 4 .121, :
) DTE/DCE -
i DNIC + NTN - ;
ii DCC + N - .
NTN (SA ) 10 , NN - NN=NI+NTN 11 .