The difference between wires, cables, optical fibers and optical cables in daily life

- Oct 08, 2019-

1. Difference between wire and cable

In fact, there are no strict boundaries between "wires" and "cables." Generally, a product with a small number of cores, a small product diameter, and a simple structure is called a wire, a non-insulated wire is called a bare wire, and the other is called a cable; a conductor having a large cross-sectional area (greater than 6 square millimeters) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire; cables generally have more than 2 layers of insulation, most of which are multi-core structures, wound around the cable drum, and generally have a length greater than 100 meters.

In daily habits, people call household wire as a wire and power cable as a cable.


2. Cable and cable difference

Cable: When the phone converts the acoustic signal into an electrical signal and transmits it to the switch via the line, the switch transmits the electrical signal directly to the other telephone through the line. The line transmitted during the call is the cable. The cable is mainly copper core wire. The diameter of the core wire is 0.32mm, 0.4mm and 0.5mm. The larger the diameter, the stronger the communication capability. There are also 5 pairs, 10 pairs, 20 pairs, 50 pairs, 100 pairs, 200 according to the number of core wires. To wait, the logarithm mentioned here refers to the maximum number of users that the cable accommodates;

Cable: It is bulky, heavy, and has poor communication capability and can only be used for short-range communication.


Optical cable: When the phone converts the acoustic signal into an electrical signal and transmits it to the switch via the line, the switch transmits the electrical signal to the photoelectric conversion device (converts the electrical signal into an optical signal) and transmits it to another photoelectric conversion device via the line ( Convert the optical signal into an electrical signal), and then to the switching device, to the other phone to answer. The line between the two photoelectric conversion devices is the optical cable. It is said that it only has the number of cores, and the number of cores is: 4, 6, 8, 12, and so on.

Optical cable: its advantages of small size, low weight, low cost, large communication capacity and strong communication capability.


Due to a number of factors, it is currently only used for communication between long distances and points and points (ie, two switch rooms). The difference is that the inside of the cable is a copper core wire; the inside of the cable is glass fiber.


3. Cable and fiber difference

Cable: A cable is a wire made of one or more insulated conductors that are insulated from each other and that transmit power or information from one location to another. Broadly speaking, it refers to a device that uses metal as a medium to transmit electrical signals.


Optical fiber: Optical fiber is a shorthand for optical fiber. It is a fiber made of glass or plastic and can be used as a light-conducting tool. The transmission principle is 'total reflection of light'.


Usually the terms fiber and cable are confused. Most optical fibers must be covered by several layers of protective structures before use. The covered cables are called optical cables. The protective layer and the insulating layer of the outer layer of the optical fiber prevent damage to the optical fiber in the surrounding environment, such as water, fire, electric shock, and the like. Cables are divided into: cable, aramid, buffer and fiber. Fiber and coaxial cables are similar except that there is no mesh shield. The center is the light-transmitting glass core.

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