ISDN , CCITT (. 6.17). , (reference points) .
. 6.17. ISDN
NT1 (Network Termination 1) (Digital Suscriber Line, DSL) , ISDN. NT1 CSU, CSU, ISDN. U NT1 . NT1 ( ), . NT1 , (, ISDN) NT1. NT1 , NT1.
BRI, 2- ( ). 2B1Q - . 5,5 .
PRI 1 1, 4- 1800 .
NT2 (Network Termination 2) , . , : (), BRI, , (, D), TDM, . NT2 NT1 . NT1.
1 (Terminal Equipment 1) , BRI PRI. S , ISDN. -. NT2 , S S/T.
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2 (Terminal Equipment 2) , BRI PRI. , , ISDN, RS-232C, .21 V.35. ISDN (Terminal Adaptor, ). - .
S/T 4- . 1 NT1 NT2 , ISDN , 4-- , 2-. BRI AMI, , - . PRI , , 1 1, B8ZS HDB3.
PRI 100 1000 (. 6.18).
. 6.18.
, (1 2+) , 8 NT1 ( NT2 ) ( Ethernet, 4- ). ( R, ) NT (. . 6.18, ) 1000 . (. . 6.18, ) 100-200 . , ( 25-50 ), 500 (. . 6.18, ). , NT1, 8 , 1000 (. . 6.18, ).
ISDN
ISDN , , - , . ISDN , -, , -, , , ISDN, . TCP/IP , . ISDN - ISDN .
ISDN - . ISDN , ITU-T E.163. , .25. ISDN .164.
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.163 12 , ISDN .164 55 . ISDN . . , ISDN. ISDN 15 , .163, ( 1 3 ), . ISDN 40 . , S. , , , 7-095-640-20-00, , 134, 7-095-640-20-00-134.
, ISDN, ISDN. , .25, X.I 21, ISDN, , .121, , , .121. ISDN .25 ISDN - .25, D . ISO 7498.
ISO 7498 , . AFI (Athority and Formay Identifier) . AFI 6 :
- , , ISDN;
- , ( );
- , , Forum. AFI IDI (Initial Domail Identifier) - , DSP (Domain Specific Part), , INI .
AFI:
X.I 21-36, , 37, . INI 14 , DSP 24 .
ISDN .164 - 44, , 45, . IDI 15 , DSP 40 .
PSTN E.I 63 - 42, , 43, . IDI 12 , DSP 26 .
ISO DCC (Digital Country Codes) - 38, , 39, . INI 3 ( ), DSP 35 .
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. IDI , DSP. IDI. IDI , DSP.
ISDN : ISDN , , ISDN .25, .25. . - ISDN , ISDN, , .