.
: 12,5 6,25 . , , , , , .
(STP Shielded Twist Pair) (UTP Unshielded Twist Pair ) . , , ().
1. 2 4 /. , . Ethernet (, 10Base-T) 3, Token Ring 4. 5 6.
5 100 , 0,51 , . UTP 100 . 5 100 100 24 , 10 100 7 -
6 7 , PIC, , . 6 5 , 0,5 , 100 22 . 7 , 8 , 100 20 , 600 - 50 .
. .
(902... 928 2,4... 2,5 ) . 5,725... 5,85 .
- (), PCM (Pulse Code Modulation). , dt, . , dt : , .
. . 2.7. . , .
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, ISDN (Integrated Service Digital Network ).
ISDN . ISDN 56 / 1,54 / ISDN (Broadband ISDN, B-ISDN) 155... 2048 /.