Un cavo coassiale è un filo e una linea di trasmissione del segnale, generalmente causato da quattro strati di materiale.
Il più interno è un filo di rame conduttivo, e l'esterno della linea ha uno strato di plastica che lo circonda, è un isolante e un uso dielettrico.
Isolante esterno e un sottile strato di corpo conduttivo a rete, generally copper or alloy.
Then the conductive body outside is the outermost layer of insulating material as the outer skin.
Coaxial cables can be used for the transmission of analog and digital signals for a wide variety of applications, the most important of which is cable television transmission. Long-distance telephone transmission, short-distance connections between computer systems, and local area networks.
Cable wire coaxial is developing rapidly as a means of distributing television signals to thousands of homes, which is cable television. A cable TV system can be loaded with dozens or even hundreds of TV channels, and its transmission range can reach tens of kilometers.
Coaxial cables are generally divided into the following two categories, depending on their structural role:
The shield of baseband coaxial cable wire is usually a mesh structure made of copper with a characteristic impedance of 50 OH.
This cable is used to transmit digital signals and is generally available in RG-8 thick cable and RG-58 thin cable.
The most intuitive difference between coarse and fine cables is the difference in cable diameter.
The coaxial cord is suitable for larger local networks, it has a long standard distance and high reliability.
Tuttavia, coarse cable networks must be installed with transceiver and transceiver cable, the installation is also difficult. So the overall cost is high. In contrast, the thin cable is simpler and less expensive.
Tuttavia, because the cable has to be cut off during installation, it is prone to the potential for poor contact when there are many connectors.
Whether the network is connected using thick or thin cables, the point of failure often affects all machines on the entire cable. And the fault is troublesome to diagnose and repair.
Perciò, baseband coaxial cables have been gradually replaced by shielded twisted pairs or fiber optic cables.
Wideband coaxial cable has a shield usually stamped from aluminum and has a characteristic impedance of 75 OH.
This cable is usually used to transmit analog signals, commonly known as RG-59, and is the standard transmission cable used in cable television networks, allowing multiple television signals to be transmitted simultaneously in a single cable.
Broadband coaxial cable can also be used as a transmission medium for some computer networks.
Coaxial cables have always been an important part of long-distance telephone networks.
Tuttavia, in today’s rapidly developing society, it faces increasing competition from optical fiber, terrestrial microwave, and satellite.
The main differences between the three are as follows:
So the video signal in the twisted pair to achieve long-distance transmission must be amplified and compensated, twisted pair video transmission equipment is to complete this function.
2. IL structure of the optical fiber is very similar to that of coaxial cable, with the center being an optical fiber made of glass or transparent plastic, surrounded by a protective material, and multiple fibers can be combined inside a single fiber optic cable as needed.
Perciò, the signal transmission distance is much farther than the above transmission of electrical signals of various network cables and is particularly suitable for the electromagnetic environment in harsh places.
It is characterized by good anti-interference ability, the stable transmission of data, and cheap price, and is also widely used, such as closed-circuit TV lines.
The coaxial cable is used to connect with the BNC head. The coaxial cable provided by the ZMS cable supplier is generally a finished product that has been connected to the BNC head, so you can choose it directly.
Parlando in generale, the higher the frequency of the signal, the greater the attenuation.
The above is an introduction to coaxial cable, the cable often used in life, if you have any doubts about the purchase, we have a professional cable sales representative with one-stop service to help you.
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