- Txhais ntawm twisted khub cable
Twisted khub cable yog ib hom kev xaim uas tsim los ntawm ob txoj kab hluav taws xob sib cais sib tw ua ke raws li tus qauv. Los ntawm kev sib tw ntawm cov xov hlau, ib feem ntawm lub suab nrov yog xa mus rau hauv ib qho kev taw qhia (xa), thaum lwm qhov yog kis mus rau qhov sib txawv (tau txais). Daim ntawv ntawm kev sib tw ntawm cov xov hlau no tuaj yeem txo qhov sib nqus ntawm cov xov hlau zoo, thiab cov teeb liab cuam tshuam los ntawm sab nraud yuav raug cuam tshuam los ntawm kev sib tw ntawm cov xov hlau. Hauv cov ntsiab lus yooj yim, piv nrog cov xaim ib leeg lossis ib qho tsis sib tw kab rov tav cov hlua khi, cov hlua khi hlua khi txo cov hluav taws xob hluav taws xob ntawm cov hlua hlau thiab cov crosstalk ntawm cov khub hlau uas nyob ib sab, thiab tiv thaiv electromagnetic cuam tshuam los ntawm sab nraud. Raws li EIA/TIA-568 tus qauv, twisted khub cables muab faib ua ntau pawg, xws li Cat5e, Cat6, Cat7, thiab Cat8 yog tag nrho cov kab sib tw.
- Hom twisted khub cables
Txhawm rau tiv thaiv kev cuam tshuam zoo dua thaum lub teeb liab kis tau tus mob, qee qhov sib tw twisted cables tau thaiv. Cables nrog shielding yog hu ua shielded twisted khub (STP), thiab cables tsis muaj shielding yog hu ua unshielded twisted khub (UTP).
1. Unshielded twisted khub cable
Unshielded twisted khub cable (UTP) yog ib qho khoom siv hluav taws xob uas tsis tshua muaj hluav taws xob ua los ntawm plaub khub ntawm cov hlua hluav taws xob sib tw ua ke thiab tiv thaiv los ntawm lub tes tsho yas rwb thaiv tsev. Tsis muaj txhuas ntawv ci los yog hlau braided shielding txheej nyob rau hauv lub unshielded twisted khub cable, uas ua rau cable txoj kab uas hla me me. 24 AWG (American Wire Gauge) yog qhov loj tshaj UTP cable loj. FS kuj tseem muab cov cables ultra-fine network nrog lub cheeb ntawm 28AWG, uas txhawb nqa 250MHz bandwidth thiab 1000-T Ethernet, ua kom yooj yim rau kev tswj cov cables hauv qhov chaw nqaim thiab pab txhim kho huab cua ncig ntawm cov khoom siv.
1) Daim ntawv thov ntawm UTP cables
Ntxiv nrog rau kev siv hauv Ethernet kev sib txuas thiab xov tooj, UTP cables kuj tau siv ntau zaus hauv kev sib txuas hauv computer. Raws li qhov bandwidth ntawm UTP cables nce kom phim lub baseband ntawm TV signals, UTP cables tam sim no kuj siv nyob rau hauv video daim ntaub ntawv xws li kev ruaj ntseg koob yees duab.
2) Qhov zoo ntawm UTP cables
① Piv nrog rau lwm cov xov xwm sib kis, UTP cables pheej yig dua thiab pheej yig dua.
② UTP cables yog qhov sib xws heev thiab tuaj yeem siv nrog rau feem ntau lwm cov kev sib txuas hauv nruab nrab yam tsis muaj av.
③ UTP cables me me thiab yooj yim rau nruab thiab tswj.
2. shielded twisted khub cable
Qhov txawv ntawm UTP unshielded cable yog tias STP shielded cable yog nruab nrog txhuas ntawv ci thiab hlau braided mesh shielding txheej sab hauv, uas tuaj yeem tiv thaiv cov teeb liab xaim hluav taws xob los ntawm kev cuam tshuam, yog li ua tiav cov ntaub ntawv xa mus sai. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm STP cable yog kom nyiam cov teeb liab cuam tshuam rau txheej thaiv thiab tom qab ntawd qhia nws mus rau hauv av cable. Raws li cov txheej txheem sib txawv, STP cable tuaj yeem muab faib ua ob hom: aluminium foil shielded cable (FTP-Foiled Twisted Pair) thiab ob chav shielded cable (SFTP-Shielded / Foil Twisted Pair):
Aluminium foil shielded cable (FTP)-Cov twisted khub ntawm FTP cable yog qhwv nrog txhuas ntawv ci shielding txheej los tiv thaiv cable los ntawm electromagnetic cuam tshuam thiab crosstalk.
Ob chav shielded cable (SFTP)-SFTP cable yog hlau braided mesh shielding txheej qhwv nyob rau hauv lub hauv paus ntawm aluminium foil shielding txheej ntawm FTP / STP. Cov khoom ntawm cov hlau braided mesh feem ntau yog tinned tooj liab. Nrog rau ob txoj koob hmoov ntawm aluminium foil shielding txheej thiab hlau braided mesh shielding txheej, SFTP cable muaj lub zog tiv thaiv kev cuam tshuam thiab ua tau zoo txo qhov txo qis ntawm cov teeb liab sab hauv. Nws yog lub cable nrog lub siab tshaj plaws tiv thaiv qib kev ua tau zoo.
- Hom twisted khub connectors
Nyob ntawm daim ntawv thov scenario, twisted khub connectors feem ntau muab faib ua ob hom: RJ11 connector thiab RJ45 connector:
1. RJ11 connector
RJ11 yog tus qauv Asmeskas xov tooj sib txuas, feem ntau muaj 6 tus pins thiab 4 lossis 2 tus neeg sib cuag, sawv cev ua 6P4C (rau txoj haujlwm, plaub tus neeg xyuas pib) thiab 6P2C (rau txoj haujlwm, ob tus neeg xyuas pib). RJ11 connector yog compact thiab yog ib qho kev xaiv zoo tshaj plaws rau kev lag luam thiab kev siv xov tooj hauv tsev.
2. RJ45 connector
RJ45 connector yog loj dua RJ11 connector thiab yog cov feem ntau siv connector tam sim no. Nws muaj 8 tus pins thiab 8 tus neeg sib cuag, sawv cev ua 8P8C. RJ45 connector yog ib qho tseem ceeb ntawm Ethernet network kev twb kev txuas, thiab feem ntau yog siv los txuas cov computers, routers, keyboards thiab lwm yam khoom siv hauv network ntawm ob qho tib si kawg ntawm cov khub twisted.
