CoaxialCmuaj peev xwm ("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 cmuaj peev xwm and its shield have the same axis or center point. Some coaxial cmuaj peev xwms may have multiple shielding layers, such as a four-shielded coaxial cmuaj peev xwm, 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 cmuaj peev xwm make it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances.
Although we usually think that coaxial cmuaj peev xwm is only used in broadband video and cmuaj peev xwm 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 cmuaj peev xwm medium and how to test it.
There are many different types of coaxial cmuaj peev xwms 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 cmuaj peev xwmsyogRG6, RG11thiabRG59, ntawm uasRG6yog feem ntau siv raws liCCTV Cmuaj peev xwmthiabCATV Cmuaj peev xwm 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 cmuaj peev xwms are more costly and very difficult to bend, which makes them unsuitmuaj peev xwm for deployment in indoor applications, but more suitmuaj peev xwm 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.
Cov teeb liab digital 3 (DS3) siv nyob rau hauv chaw ua haujlwm hauv nruab nrab (tseem hu ua T3 kab) kev pabcuam xa xov kuj sivCoaxial cmuaj peev xwms, suav nrog 75Ω 735 type and 734 type. The 735 type cmuaj peev xwm has a coverage distance of 69 meters, while the 734 type cmuaj peev xwm has a coverage distance of 137 meters. RG6 cmuaj peev xwm can also be used to transmit DS3 signals, but the coverage distance is shorter.