ISDN
ISDN (. Integrated Services Digital Network) . .
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XI CCITT 1981 .
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64 /c . 4 , , 8 . 8. , (8 * 8 ( ) = 64) B- ISDN, 64 /. 2 × B + D = 2 × 64 + 16 = 144 /. B- D- ISDN : 0 384 /, 11 1536 /c 12 1920 /c ( ). (1544 2048 /) D- 64 /.
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ISDN TDM (. Time Division Multiplexing, ). , ( ). , . CALL , .
ISDN , .
| A | , 4. | |
| B | 64 / | 1 (1 ) |
| C | 8/16 / | |
| D | 16/64 / | ( ) |
| E | 64 / | ISDN |
| H0 | 384 / | |
| H10 | 1472 / | |
| H11 | 1536 / | |
| H12 | 1920 / |
B D.
, :
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(. Basic Rate Interface, BRI) ISDN- B- D-. 2B+D. BRI B- (, , ) . . BRI 128/. D- . AO/DI (Always On/Dynamic ISDN) 9.6 /c D- X.25, , . , B-. , ( X.31), . BRI 7 () ISDN-, . , , ISDN, , . «» X2 (.) US Robotics, ISDN 56/c.
DSS1 (. Digital Subscriber System No. 1), Euro-ISDN. BRI S/ NT. S/ ISDN , NT . ISDN , ( HFC) ISDN (. inline power). «-» (. point-to-multi-point, PTMP) MSN (. Multiple Subscriber Number), «-» (. point-to-point, PTP).
MSN, , , . MSN. « » MSN.
BRI , .
ISDN BRI: U, S T.
- U , , . U- 1 , (. Network Termination, NT-1 NT-2).
- S/T (S0). , . RJ-45 RJ-11 /. S/T () 8 ISDN , , , TE1 (Terminal Equipment 1). MSN. SCSI.
- NT-1, NT-2 Network Termination, . U (NT-1) (NT-2) 2- S/T ( ). S T , , S TE , , T . NT-1 NT-2 , S/T.
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(Primary Rate Interface, PRI) , . :
E1 ( ) 30 - D- 30B+D. PRI , .
1 ( , DECT) 23 - D- 23B+D.
(. Primary Rate Interface, PRI) ISDN, ISDN , . 23 - D- 1 (23B + D=24*64=1536[kBit/s]) 30 - , D- - E1 (30B + D + =32*64=2048[kBit/s]).
[] ISDN
ISDN :
. : TE1 ( ISDN-), TE2 ( ). TE1 ISDN, TE2 (TA).
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( ) ISDN It Still Does Nothing ( ), , 230- ISDN, ( ).
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- Ethernet, bhv, 2007 ISBN 978-5-9775-0007-4
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- . ISDN. . , , . . .: , 1991.
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