FDDI ( ). , . . IBM PC- EISA PCI, VLB. (S), ( ). , . FDDI (TPDDI, CDDI) RJ-45 .
(D, SAC ) () . FDDI, , . - SM- ( MIC SC), UTP (RJ-45) STP (DB-9).
PC, FDDI, , (Ethernet, Token Ring).
FDDI (FDDI bridge) ( FDDI) (Ethernet Token Ring). , . Ethernet Token Ring : . (translation bridge) - -FDDI FDDI, , , Ethernet FDDI. (encapsulation bridge) : -, , FDDI . - , . FDDI , .
, , xDSL. (ISDN), .25 Frame Relay. ATM .
( ). PSTN (Public Switched Telephone Network ) POTS (Plain Old Telephone Service ). (CCITT, ITU).
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3,1 , . , . (echo cancellation), . - . , , , , , , , , ( ), . (, , ), , .
, . , . ( ). , . (FDM Frequency Division Multiplexing) , . , , 3,1 . ( , ), , .
. . . (-) (-). , . (3,1 ) 8 ( 2 ). ( ) 8- . , 64 / (8 8 ). G.711. , - () (Pulse Code Modulation).
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7- , () . 56 /. ISDN ( ) , , ( ) ( ).
, . . , , , . (TDM Time Division Multiplexing). ( ). - , . , .
, . ( ) 1/ 2//4; , 1/2//4.