, ISDN , , , : BRI 128 / ( ), PRI - 2,048 /. , , , , .
BRI , PRI - , .
, ISDN .
- .25, . ISDN .25. , ISDN - .
- frame relay - , frame relay . , .
, D. D , .25, LAP-D . ISDN .25, .25 (. 6.20). .25 D. .25 D 9600 /.
. 6.20. .25 D ISDN
ISDN . - , . , ISDN , , . ISDN - , .
- .
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: , , , , .
. (FDM) (TDM) , 2- . TDM, (DSL).
10 , 5 .
, , - . (FDM) .
. Hayes- , - V.25 V.25 bis.
- V.34+, V.90, V.42 V.42 bis. V.34+ 2- . V.42 LAP-M HDLC, VC.42 bis - . HDLC, - SDC Motorola.
V.90 , , . 56 / - .
:Switched 56 ISDN.
Switched 56 - , 4- 1/1, 56 /. . Switched 56 56 /.
- ISDN - . ISDN , , (frame relay).
UNI ISDN - BRI PRI. BRI 2B+D. PRI - 23B+D 30B+D.
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D , ISDN: -, , -, .25 ISDN .25, ISDN.
DSL ISDN BRI 2- 5,5 .
ISDN . D - , 9600 /. ISDN , , .