ഏകോപനംCകഴിവുള്ള ("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 cകഴിവുള്ള and its shield have the same axis or center point. Some coaxial cകഴിവുള്ളs may have multiple shielding layers, such as a four-shielded coaxial cകഴിവുള്ള, 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 cകഴിവുള്ള make it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances.
Although we usually think that coaxial cകഴിവുള്ള is only used in broadband video and cകഴിവുള്ള television (CAടിവി) home applications, in the business enterprise environment, from closed circuit television (CCടിവി), audio and video to RF antennas, and even some network connections, you can find Its figure. Therefore, it is very necessary to understand this cകഴിവുള്ള medium and how to test it.
There are many different types of coaxial cകഴിവുള്ളs 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 cകഴിവുള്ളsആകുന്നുRG6, RG11ഒപ്പംRG59, ഏതിന്റെRG6സാധാരണയായി ഉപയോഗിക്കുന്നുCCടിവി Cകഴിവുള്ളഒപ്പംCAടിവി Cകഴിവുള്ള 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 cകഴിവുള്ളs are more costly and very difficult to bend, which makes them unsuitകഴിവുള്ള for deployment in indoor applications, but more suitകഴിവുള്ള 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.
സെൻട്രൽ ഓഫീസിൽ ഉപയോഗിക്കുന്ന ഡിജിറ്റൽ സിഗ്നൽ 3 (ഡിഎസ് 3) സിഗ്നലും (ടി 3 ലൈൻ എന്നും വിളിക്കുന്നു) ട്രാൻസ്മിഷൻ സേവനവും ഉപയോഗിക്കുന്നുCoaxial cകഴിവുള്ളs75 ഉൾപ്പെടെΩ 735 type and 734 type. The 735 type cകഴിവുള്ള has a coverage distance of 69 meters, while the 734 type cകഴിവുള്ള has a coverage distance of 137 meters. RG6 cകഴിവുള്ള can also be used to transmit DS3 signals, but the coverage distance is shorter.