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Коаксијални кабл се не сме занемарити


Коаксијални кабл се не сме занемарити




КоаксијалниCу могуцности ("coax" for short) has long been used to transmit data and video signals. It is one of the first media to support 10BASE2 and 10BASE5 Ethernet, which can achieve 10 Mb/s up to 185 meters or 500 meters, respectively. s transmission. The term "coaxial" means that the central conductor of the cу могуцности and its shield have the same axis or center point. Some coaxial cу могуцностиs may have multiple shielding layers, such as a four-shielded coaxial cу могуцности, which contains two layers of shielding, and each layer of shielding is composed of aluminum foil wrapped with wire mesh. The shielding characteristics of coaxial cу могуцности make it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances.


Although we usually think that coaxial cу могуцности is only used in broadband video and cу могуцности television (CAТВ) home applications, in the business enterprise environment, from closed circuit television (CCТВ), audio and video to RF antennas, and even some network connections, you can find Its figure. Therefore, it is very necessary to understand this cу могуцности medium and how to test it.


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There are many different types of coaxial cу могуцностиs 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 Coaxial cу могуцностиsсуРГ6, РГ11иРГ59, од чегаРГ6најчешће се користи каоCCТВ Cу могуцностииCAТВ Cу могуцности in corporate environments. The center conductor of РГ11 is thicker than РГ6, which means that its insertion loss is lower and the signal transmission distance is longer. However, thicker РГ11 cу могуцностиs are more costly and very difficult to bend, which makes them unsuitу могуцности for deployment in indoor applications, but more suitу могуцности for long-distance outdoor installations or straight backbone links. РГ59 is more flexible than РГ6, 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.



Сигнал дигиталног сигнала 3 (ДС3) који се користи у централној канцеларији (такође се назива Т3 линија) такође користи услугу преносаCoaxial cу могуцностиs, укључујући 75Ω 735 type and 734 type. The 735 type cу могуцности has a coverage distance of 69 meters, while the 734 type cу могуцности has a coverage distance of 137 meters. РГ6 cу могуцности can also be used to transmit DS3 signals, but the coverage distance is shorter.