Izindaba Zemboni

Ikhebula le-cocoa alikwazi ukushaywa indiva

2021-03-05

Ikhebula le-Coaxialcanunganakwa

 

Ekuhlolweni kwekhebula lethusi, sixoxe okuningi ngokuqukethwe okuhlobene nekhabhathi okusontekile, okufana nesigaba 6 (CAT 6), isigaba 6 (CAT 6A) kanye nesigaba 8 (CAT 8). Yize lolu hlobo lokufaka ikhebula lusetshenziswa kabanzi ukuxhasa ukudluliswa kwezwi, idatha nevidiyo ye-Ethernet, akusho ukuthi luwukuphela kohlobo lokufaka ikhabethe ongahlangana nalo.

Ikhebula le-Coaxial("i-coax" ngesiNgisi) kade yasetshenziswa ukudlulisa amasiginali wedatha namavidiyo. Ungomunye wabezindaba bokuqala ukuxhasa i-10BASE2 ne-10BASE5 Ethernet, engathola ama-10 Mb aze afike kumamitha ayi-185 noma amamitha ayi-500, ngokulandelana. / s ukudluliswa. Igama elithi "coaxial" lisho ukuthi umqhubi ophakathi kwekhebula nesihlangu salo bane-eksisi efanayo noma iphuzu lesikhungo. Ezinye izintambo ze-coaxial zingaba nezendlalelo eziningi zokuvikela, ezinjengezivikelo ezineikhebula le-coaxial. The cable contains two layers of shielding, and each layer of shielding is composed of aluminum foil wrapped with wire mesh. The shielding characteristics of ikhebula le-coaxial make it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances.

Although we usually think that ikhebula le-coaxial is only used in broadband video and cable television (CATV) home applications, but in the commercial enterprise environment, from closed circuit television (CCTV), audio and video to radio frequency antennas, and even some network connections, you can find Its figure. Therefore, it is very necessary to understand this cable medium and how to test it.

Uhlobo oluyinhloko

There are many different types of ikhebula le-coaxials that support a wide range of professional applications, such as satellite communications, industrial, military, and marine applications. The three most common types of non-industrial ikhebula le-coaxials are RG6, RG11, and RG59, of which RG6 is most commonly used in applications such as CCTV and CATV in corporate environments. The center conductor of RG11 is thicker than RG6, which means that its insertion loss is lower and the signal transmission distance is longer. However, thicker RG11 cables are more costly and very difficult to bend, which makes them unsuitable for deployment in indoor applications, but more suitable for long-distance outdoor installations or straight backbone links. RG59 is more flexible than RG6, but its loss is higher. It is rarely used in other applications except for low-bandwidth, low-frequency analog video applications (rear-view cameras in automobiles) with short distances and limited wiring space.

 

Ikhebula le-Coaxialsfuthi inemikhawulo ehlukile-imvamisa i-50, 75, ne-93Ω. 50Ω ikhebula le-coaxials have high power handling capabilities and are mainly used in radio transmitters such as amateur radio equipment, civil band radio (CB) and walkie-talkies. 75 Ω izintambo zingagcina amandla esignali kahle futhi zisetshenziswa kakhulu ukuxhuma izinhlobo ezahlukahlukene zemishini yokwamukela, njengabamukeli bekhebula le-cable (CATV), amathelevishini anokucaca okuphezulu kanye namarekhodi evidiyo edijithali. 93Ω ikhebula le-coaxial was used in IBM mainframe networks in the 1970s and early 1980s, with very few applications and expensive. Although the 75 Ω ikhebula le-coaxial impedance is most commonly encountered in most applications today, it should be noted that all components in the ikhebula le-coaxial system should have the same impedance to avoid signal loss and signal loss at the connection point. Internal reflections that reduce video quality.

The digital signal 3 (DS3) signal used in the central office (also known as T3 line) transmission service also uses ikhebula le-coaxials, including 75 Ω Uhlobo lwama-735 nohlobo lwama-734. Ikhebula lohlobo lwama-735 linebanga lokumbozwa elifinyelela kumamitha angama-69, kanti ikhebula lohlobo lwama-734 linebanga lokumboza elifinyelela kumamitha ayi-137. Intambo ye-RG6 nayo ingasetshenziselwa ukudlulisa amasiginali we-DS3, kepha ibanga lokumbozwa lifushane.

For any ikhebula le-coaxial, successful installation depends on the use of high-quality components and correct installation techniques, especially the installation of connectors. Insertion loss is affected by the total length of the installed link and is the main parameter to ensure that the ikhebula le-coaxial supports the intended application.