The network cable is an indispensable medium in the connection between the local area network and the wide area network. In our life, our common network lines are: twisted pair, coaxial cable, and optical fiber.
How to distinguish the network cable?
1. Cut the outer layer of the sheath first, unplug the insulation, and then cut the conductor for a small section to see if the copper color of the cross section is uniform. If it is pure copper, it will be uniform gold color; but if it is mixed with iron Or aluminum, or other alloys, can see visible white spots or black.
2. The surface of the conductor copper that is burnt with the sun will appear black and the inner color is still unchanged. After the blackened part is wiped off, the copper still retains the original color; but if it contains iron, no matter how you rub it They are all dim black.
3, the inner layer of insulation, can be pulled out of a section, and then squeezed on both sides by hand, the longer the stretch, the better the material; the color itself is bright, the surface is smooth.
4, the outer jacket color is different, taken from the customer's request, the pass is dark gray or light gray. The surface of the sheath is evenly and tightly colored, and the cross section is gray and white and contains no impurities. The body is torn without wire, and the wire is straight and teared down to facilitate the cutting; the horizontal tearing is difficult to protect, and the two tearing are different. Original material.
The difference between network cable and telephone line
First, the role is different
1. The telephone line is modulated by ADSL, and the digital signal of the computer is modulated into an analog line number to be transmitted through the telephone line. After the opposite end is the telecommunications side, the analog signal is demodulated into a digital signal. The network cable is less than the modulation and demodulation step.
2. Bandwidth issues. The telephone line is affected by the physical bandwidth. Generally, the bandwidth is not too high (the maximum broadband value is 8M), and the physical bandwidth of the network cable is relatively high (a good network cable can reach 1000M or more).
Second, the interface is different
Why use cats to connect to the phone interface, and the network cable interface does not respond to the connection, this is because the signal from the phone line, after the cat's conversion and processing can be forwarded to the network device, such as forwarding to the computer, router, Hubs and switches, etc. If it is directly connected, it is an unrecognizable analog signal, which is equivalent to no signal. In other words, the role played by the cat in the middle is the signal conversion and simple processing. Specifically, the analog signal from the telephone line is converted into a digital signal and handed over to the network device, and the digital signal transmitted by the network device is converted into an analog signal. The telephone line is sent out.
Is the network cable and telephone line shared?
The method of selecting a network cable and a telephone line to share a network cable is common in network systems of small and medium-sized enterprises, especially small enterprises. Some network managers have made neutralizations in telephone and network for the consideration of saving the funds for integrated wiring, and choosing the method of sharing a network cable between the network cable and the telephone line as a solution to the current situation. To avoid post-management and maintenance and troubleshooting, it is not recommended to have a network cable for the phone and the network.