, , , . , . , , . , . Attenuation Crosstalk Ratio , . .
, , , ACR .
ELFEXT (Equal Far End Crosstalk)
(FEXT) (Attenuation) . ELFEXT - ACR , .. FEXT Attenuation . ELFEXT , .
PS-ELFEXT (Power Sum Equal Far End Crosstalk)
ELFEXT .
Return Loss (RL)
, . Return Loss " " . Gigabit Ethernet, ( ). . Return Loss .
, CAT1 CAT7 . . EIA/TIA 568 ( ).
CAT1 ( 0,1 ) , ( , ). , . .
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CAT2 ( 1 ) , 2 , 4 /, token ring ARCNet. .
CAT3 ( 16 ) 4- , 10BASE-T token ring, 10 / 100 / 100BASE-T4. , IEEE 802.3. .
CAT4 ( 20 ) 4 , token ring, 10BASE-T, 100BASE-T4, 16 / , .
5 ( 100 ) 4- , 100BASE-TX , 100 / 2 . CAT5e, , , , 100 / 2 , 1000 / 4 , , . (-, -, -) - 100 . - - 5 .
CAT6 ( 250 ) Fast Ethernet Gigabit Ethernet, 4 1000 /. 2002 . CAT6a, 500 . IEEE, 70 % 2004 , CAT6.
CAT7 ,
100 /, 600700 . . , , UTP, S/FTP (Screened Fully shielded Twisted Pair).
SFTP Category 7 Belden 1885 ENH
7 4 23 AWG c - FSTP (ISTP) EN 50173, ISO/IEC 11801
: | 23 AWG | 0.57 |
: | 1.45+0,05 | |
1: | / + | |
2: | + | |
: | FRNC- , , . | 8.0+0,3 |
: | 60 / | 500 |
:
( )(DCR): 75 /
/100 | (Next) /100 | (ACR) /100 | |
MHz | |||
1.0 | 1.9 | 100.0 | |
4.0 | 3.5 | 100.0 | |
10.0 | 5.4 | 100.0 | |
16.0 | 6.9 | 100.0 | |
20.0 | 7.6 | 100.0 | |
31.2 | 9.6 | 100.0 | |
62.5 | 13.6 | 100.0 | |
100.0 | 17.4 | 95.0 | |
155.0 | 21.7 | 95.0 | |
200.0 | 24.7 | 95.0 | |
300.0 | 30.5 | 90.0 | |
600.0 | 44.6 | 90.0 |
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|
1 : | 48 / |
(NNP): | 0.75 |
(SKEW): | < 15 ./100 @100MHz |
: | 60 |
: | 30 |
(Impedance): | 100 15 % @ 1 - 100 MHz |
100 22 % @ 100 - 250 MHz | |
100 25 % @ 250 - 600 MHz | |
: | -20 +60o |
: | 0 +50o |
, , , 120 , . , "" , .
- , . . 0,50,65 . 0,2 , ( PVC), 5 (PP), (PE). () , , , .
( ), , , . , , .
0,50,6 , . .
. , , , . , , c , , .
. , (1 = 12 = 1/7 = 1/660 = 30,48 ).
. . , , .
, ( ) , . , .
. . : , , . , . , ( ), . , . , -, - .. , .
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- . " Ring ", " Tip ". . 30- "Tip30".
( ) AWG (American Wire Gauge). .
6.5. , " "
() 8P8C, , " ". (. .4.1) 8 , RJ45, . 6 , RJ11 RJ12 .
.4.1
, RJ , USOC (Universal Service Ordering Codes). RJ Registered Jack.
. , , 6- RJ11C, RJ14C, RJ25C. 8- RJ61C (4 ) RJ48C. 8- RJ45S, RJ46S, RJ47S.
DEC (Digital Equipment Corporation). , , .
5 (4 ).
2 : (-) . /, 2 / (uplink ).
6.6.1. " "
- T568A T568B. (. .4.2) ,
. , USOC. ISDN (Integrated Servises Digital Network), . , , . 3, 4, 5, 5e 6. .
|
.4.2
1 - | 1 - |
2 | 2 |
3 - | 3 - |
4 | 4 |
5 - | 5 - |
6 | 6 |
7 - | 7 - |
8 | 8 |
- USOC. (. .4.3) , , . T568, , , T568A, 3 6. , , T568A USOC - . 3 2 7. , , 1 8. USOC , 8- USOC-. - , . USOC .
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.4.3