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The coaxial cable that nots allow to ignore

by:FOT     2020-07-18
Nots allow to ignore to coaxial cable for copper tests, we discussed a lot about balance class twisted-pair copper wiring related content, such as 6 class ( 猫6) And 6 classes ( 猫6) And eight class ( 猫8) 。 Although this type of wiring has been widely applied to Ethernet support voice, data and video transmission, but this does not mean that it is you may encounter the only type of copper wiring. Coaxial cable ( English abbreviation 'coax') Has long been used to transmit data and video signals, it is a group of support one of 10 base2 and 10 base5 Ethernet medium, can be achieved respectively 185 m or 500 m 10 Mb/s transmission. The term 'coaxial' refers to the center conductor of the cable and the center of the shaft of the shield or the same. Some may have more than one shield coaxial cable, such as four shield coaxial cable, the cable contains two layers of shielding, each layer mask are made of aluminum foil wrapped screen outside. The shielding characteristics of coaxial cable make it has strong ability to resist electromagnetic interference, can be high frequency signal transmission over a long distance. Although we usually think of coaxial cable is only applied to broadband video and cable television ( CATV) Family applications, but in the business enterprise environment, from the closed circuit television ( CCTV) , audio and video to the antenna of the radio frequency, and even some Internet connection, it can be found. It is very necessary to understand this kind of cable media and learn how to test it. There are many different types of main types of coaxial cable is supported by a wide range of professional applications, such as satellite communications, industrial, military and Marine applications. Three more common type of non-industrial coaxial cable is RG6 and RG11 and RG59, RG6 more often used in business environment of China central television (CCTV) and CATV and other applications. RG11 center conductor than RG6 thick, this means that the lower insertion loss and signal transmission distance is farther. However, coarser RG11 cable cost more and very not easy to bend, making it unsuitable for deployment in indoor applications, and is more suitable for long-distance outdoor installation or straight backbone link. RG59, rather than the RG6 flexibility, but its loss is high, in addition to the short distance and trough limited space low bandwidth and low frequency analog video applications ( The car rear view camera) Outside, rarely used in other applications. The impedance of the coaxial cable also differ - — Usually the Ω 50, 75 and 93. 50 Ω coaxial cable with high power handling capacity, it is mainly used for radio transmitter, such as amateur radio equipment, cb radio ( 世邦魏理仕(CB) And radios. 75 Ω cable can better keep the signal strength, it is mainly used for connecting the various types of receiving equipment, such as cable television ( CATV) Receiver, a high-definition TV and digital video recorder. 93 Ω coaxial cable in the 1970 s and early 80 s, used in IBM mainframe, network application is very little and expensive. Although most of today is more frequently encountered in the application of 75 Ω coaxial cable impedance, but need to be aware of are all components of the coaxial cable of the system should have the same impedance, to avoid join point may cause internal reflection signal loss and reduce the video quality. For exchange ( Also known as the T3 lines) The digital signal transmission business 3 ( DS3) Signals are used in a coaxial cable, including 75 Ω type 735 and type 734. Type 735 cable covering distance is 69 meters, and 734 type cable cover distance 137 meters. RG6 cable can also be used to transmit DS3 signals, but covering distance is shorter. Test for any coaxial cable, easily installed successfully depends on the use of high quality components and correct installation technology, especially the installation of connector is especially important. Insertion loss affected by the installation link length, is to ensure that the application of the main parameters of coaxial cable support expected. ANSI/TIA- 568 - 4. D set for 75 Ω broadband coaxial cable, wire and connection hardware requirements, to ensure that its support for cable TV, satellite TV and other broadband applications. For socket and a distribution point for the wiring between the subsystem 1, the length of the RG6 limit is 46 meters, RG11 length limit for 90 meters. For distribution of the wiring between the subsystem for 2, RG6 length limit still is 46 meters, and RG11 length limit increased to 100 meters. For the above each kind of deployment, TIA - 568 - 4. D all specifies its in the insertion loss of 5 to 1002 MHz frequency range limit. DSX - DSX - CHA003 coaxial cable of the adapter USES CHA003 coaxial cable of the adapter and DSX CableAnalyzer ™ series copper authentication apparatus can be easily tested. DSX - CHA003 adapter supports RG6 and RG11 coaxial cable, coaxial cable is available in the entire frequency range test TIA insertion loss limit. Due to the insertion loss much affected by the installation link length, so even if the cable is damaged or connector installed its bad performance degradation, shorter link also can pass the test; DSX CableAnalyzer also offers length scale test limit, can be adjusted automatically according to the actual measurement length of wire insertion loss limit. DSX CableAnalyzer for center office applications using 734 type, 735 type and the coaxial cable of the RG6 provide DS - length scale 3 test limit. DSX CableAnalyzer test can also be used to support the traditional 10 base2 50 Ω or 10 base5 Ethernet coaxial cable, while the cable is only used to very rare distance is greater than 100 meters of low speed application. If you have any questions or problems, you are welcome to contact us at any time
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