KoaksialCbacarır ("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 cbacarır and its shield have the same axis or center point. Some coaxial cbacarırs may have multiple shielding layers, such as a four-shielded coaxial cbacarır, 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 cbacarır make it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances.
Although we usually think that coaxial cbacarır is only used in broadband video and cbacarır television (CATV) home applications, in the business enterprise environment, from closed circuit television (CCTV), audio and video to RF antennas, and even some network connections, you can find Its figure. Therefore, it is very necessary to understand this cbacarır medium and how to test it.
There are many different types of coaxial cbacarırs 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 cbacarırsvarRG6, RG11vəRG59, bunlardanRG6kimi ən çox istifadə olunurCCTV CbacarırvəCATV Cbacarır 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 cbacarırs are more costly and very difficult to bend, which makes them unsuitbacarır for deployment in indoor applications, but more suitbacarır 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.
Mərkəzi ofisdə (T3 xətti də deyilir) istifadə olunan rəqəmsal siqnal 3 (DS3) siqnal ötürmə xidmətindən də istifadə olunurCoaxial cbacarırs75 də daxil olmaqlaΩ 735 type and 734 type. The 735 type cbacarır has a coverage distance of 69 meters, while the 734 type cbacarır has a coverage distance of 137 meters. RG6 cbacarır can also be used to transmit DS3 signals, but the coverage distance is shorter.