Habari za Viwanda

Cable ya Koaxial ni nini?

2021-03-03

A kexial coaxial("coax"kwa Kiingereza) ni kebo iliyoundwa na kondakta wawili wa chuma wa coaxial, wenye maboksi mawili ili kuunda kitengo cha msingi (jozi ya coaxial), na kisha jozi moja au nyingi za coaxial. Imetumika kupeleka ishara za video na video kwa muda mrefu .

It is one of the first media to support 10BASE2 na10BASE5 Ethernet, which can achieve 10 Mb/s transmission up to 185 meters or 500 meters, respectively. The term "coaxial" means that the central conductor of the cable naits shield have the same axis or center point. Some kexial coaxials may have multiple shielding layers, such as a four-shielded kexial coaxial, which contains two layers of shielding, naeach layer of shielding is composed of aluminum foil wrapped with wire mesh. The shielding characteristics of kexial coaxial make it have strong anti-electromagnetic interference ability nacan transmit high-frequency signals over long distances. There are many different types of main types of kexial coaxials that support a wide range of professional applications, such as satellite communications, industrial, military namarine applications. The three most common types of non-industrial kexial coaxials are RG6, RG11naRG59, ambayoRG6hutumiwa sana katikaCCTV naCATVmaombi katika mazingira ya ushirika. Kondakta wa kituo chaRG11ni mzito kulikoRG6, which means that its insertion loss is lower nathe signal transmission distance is longer.

Walakini, mzitoKamba za RG11 are more costly navery difficult to bend, which makes them unsuitable for deployment in internal applications, but more suitable for long-distance outdoor installations or straight backbone links. RG59ni rahisi zaidi kulikoRG6, 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 nalimited wiring space. Kamba za kakao also have different impedances-usually 50, 75, na93 Ω. 50Ω kexial coaxials have high power handling capabilities naare mainly used in radio transmitters such as amateur radio equipment, civil bnaradio (CB) nawalkie-talkies. 75 Ω cables can maintain signal strength well naare mainly used to connect various types of receiving equipment, such as cable television (CATV) receivers, high-definition televisions nadigital video recorders. 93 Ω Ckebo ya oaxial was used in IBM mainframe networks in the 1970s naearly 1980s, with very few applications naexpensive. Although the 75 Ω kexial coaxial impedance is most commonly encountered in most applications today, it is important to note that all components in the kexial coaxial system should have the same impedance to avoid possible signal loss nasignal 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 kexial coaxials, including 75 Ω 735 type na734 type. The 735 type cable has a coverage distance of 69 meters, while the 734 type cable has a coverage distance of 137 meters.Cable ya RG6pia inaweza kutumika kupeleka ishara za DS3, lakini umbali wa chanjo ni mfupi.