( ) . , . , , , . , , . , , , "", (, twistedpair), , ( [UTP] [STP] ). , , - . "TwistedPair" - " ", "" , , . , "Ring" "Tip". ( ). , , Ring1, Tip1, Ring2, Tip2, .. :
/ 1- ;
/ - 2-;
/ - 3-;
/ - 4-.
25 . Ring-p , Tip-p - . , 1 Ring1-p , Tip1- - . , (4 ), . : . - AWG (AmericanWireGauge) (gauge-, ). 10Base-T 22 24 AWG. , . , " ".
(UTP)
" " , (UTP, unshieldedtwisted-pair), , (STP, shieldedtwisted-pair). UTP. Ethernet UTP. UTP 22 24 AWG 100 . . , TIA/EIA-568- UTP, . , . . . , T568-, . 3 , Ethernet 10BaseT, 10 /. 3 100 / FastEthernet, 100BaseT4, . 100BaseT4 ( 100VG-AnyLAN) , , . 4 3,
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TokenRing. UTP- 5, 100 . 10BaseT, 5, FastEthernet .
:
TIA/EIA , , , . , 5, , , , 5.
, 5
5 100 /, FastEthernet, . GigabitEthernet, 1 / (1000 /). , UTP . TIA/EIA (), , , - 5. . Anixter, Inc., TIA/EIA, . , , (levels). . , Anixter, 5 . Level 5 , 5, 200 , ISO 11801. 1,2 /, GigabitEthernet. , , 5 (Category 5 Enhanced Category 5). . Level 350 , Level 7 - 400 . , .
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TIA/EIA , , , Anixter. 5 , " ", (NEXT, near-endcrosstalk), (FEXT, far-endcrosstalk) (" ) (RL, returnloss). , 5 200 , 7 ( ) - 750 . , , .
(STP)
STP - 150 , , (EMI), , . TokenRing, STP , UTP . STP - , . , , , . , , , . . , , . . , , . , , , . , , , , . , , , , . STP : . - , , . , , (ScTP, sctrrnrdtwisted-pair) (FTP, foiltwisted-pair). , , , . STP UTP, , . - , , , EMI, STP IBM TokenRing. STP :
1. 22 AWG, , ( ) (PVC) .
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2. 22AWG, , ( ) 26 AWG . .
6. 22 AWG ().
9. 26 AWG PVC .
:
TIA/EIA-568- STP : 1, , 6 .
TokenRing STP , IDC (IBM DataConnector). , TokenRing UTP STP.
, , . . , () , , , , ( ) , . , , , 120 . , , . , , . , , . , , . UTP 5. , . , . , Ethernet 10 /. FOIRL (Fiber-OpticInter-RepeaterLink), - 10BaseF. , , . :
Fast Ethernet (100BaseFX);
Gigabit Ethernet (1000BaseFX);
Token Ring;
Fiber Distributed Data Interface (FDDI);
100VG-AnyLAN;
Asynchronous Transfer Mode;
FibreChannel.
, "" "", FDDI " " (doublering), "", .