ISDN (Integrated Services Digital Network - ) , , . , , . , . IDN - Integrated Digital Network. . 1959 . , , - . , - , ( ), ( ), . 70- . 1 , 4ESS Western Electric 1976 .
, CCITT, 1980 G.705, . ISDN 1984 I. . . , ISDN 80- , , . 1988 I , . 1992 1993 ISDN . .
ISDN - 80- , , , , , , , ISDN . , ISDN -. , . ISDN 5 % . ISDN , . , , ISDN - 1994 - 1995 , ISDN. , ISDN - , .
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ISDN (. 6.16):
. 6.16. ISDN
( );
;
;
;
(frame relay);
.
, ISDN , frame relay. , , , . , , .
ISDN : 64 /, 9600 /, 9600 / .
ISDN . frame relay ISDN, , , , ISDN.
ISDN DS-0, 64 /. - , 32 16 /.