. , 64 / 2 /, / . G.703, 2 / . G.704, - "0" , - "16" , , 12 (. ISDN). 30 - , 1920 /. , .25/75 1 FE1 (n×64 /).
. .75 LAPB, LAP I1DLC. .25, SLP MLP.
.75 .25, : m=8, 128 32768.
. .75 .25.
.25
.25 - . (1974-1984) : , (PoS) . , , . 1977 . PAD - / (). . .3, .28 .29, .25 .
PAD MAP
PAD. PAD - DTE DTE / ().
, PAD, - ., :
- ( ), PAD - DTE;
- , PAD - DTE , PAD;
- PAD .
PAD
PAD , ( - ) PAD , - DTE . PAD , :
- ;
- , , ;
- PAD;
- (, );
- , - ;
- PAD;
|
|
- break () DTE - ;
- ( PAD);
- , , .
PAD
22 30 ( .3 1984 2000.). . , . .. 0 1 PAD. - , : 1-255, 1=1/20 ; , : 0-19, : 0 - , 18 - 64000 /, , 0 - , 12 - 4096 .
MAP. MAP - PAD. . .8. - , . MAP PAD . MAP, PAD, .25 PAD.
.28 .29
., PAD, : .28 .29, .25 PAD.
.28
1977, 1980-1993. 1997. PAD DTE, - . :
- DTE PAD;
5 - DTE PAD;
- DTE PAD;
- DTE PAD.