ISDN NT-1, NT-2, TE1, TA 2 (. . 30). . ISDN BRI (2B+D) .
, ( ISDN) U-, . , , NT-1 NT-2 S- ( ) RJ-45. ( RJ-11). 48 . 2-4 ( ). S- 8 , , -, , .
, S- 1 - ( 3,1 ). ( 7 ), D-. . (, , , , . .), , -: , . ( ), , . S-, .
, , -. .
(), ISDN-, - , . - , . , ( ). , S-, U-. - USB. (64 /) . - 115 /, 128 / ( -) . USB (1,5 12 /). ISA, PCI PC Card, . , , , , ( ). MLPPP (MultiLink PPP) 128 /, . BOD (Bandwidth On Demand) - , . , , .
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( ) S- U- (Ethernet), . RS-232 . , ISDN , . , .
. 31 - ISDN, . :
() ;
-;
;
, WAN.
. 31. ISDN
. , ISDN, , , . :
$150 ($300 );
$120-250 ( );
$120 ();
$250 (4 10s). WAN , .
ISDN , PRI (23 30 -).
ISDN
D- ISDN OSI. - : ; , MLPPP, BOD, HDLC; .
ISDN ITU Q.920-Q.923, ( D) Q921.
D- LAP-D (Link cess Protocol D channel), LAP-B .25. . 32.
. 32. LAP-D
Address , . 33:
SAPI (Service access point identifier) (. 17);
C/R (Command/Response) /;
, 1 (Address Extension) ;
TEI (Terminal Endpoint Identifier) S/T.
. 33. LAP-D
16