Now most of the network cameras are installed using network cables for transmission, and the most commonly used ones are Cat5e and Cat6 cables. If the 100M network, we usually use Category 5e twisted pair, and the Gigabit network uses Category 6 twisted pair.

Wire diameter of network cable:

Let's talk about the wire diameters of the national standard super category five and category six, because there are various wire diameters of network cables in the market, and there are many non-standard ones. The wire diameter of national standard super five is 0.5, and the wire diameter of six national standard is 0.56. Theoretically, the thicker the wire diameter, the farther the transmission distance will be. But the transmission distance is also closely related to the material of the network cable.



Material of network cable:

Common materials in the market: alloy; high conductivity aluminum; high conductivity silver; pure copper; oxygen-free copper.

The alloy has the lowest price, which is iron, and the quality is also the worst.

High-conductivity aluminum is commonly called copper-clad aluminum, which is mainly made of aluminum, which is easy to oxidize, and the resistance will increase after oxidation. This is why copper-clad aluminum network cables are used to install monitoring. There is no problem when it is newly installed, but after a while there will be occasional signal problems.


The material of high conductivity silver is also aluminum, and the quality is better than copper-clad aluminum.

Pure copper material, the quality is better than aluminum, but the resistance is still relatively large.

Oxygen-free copper, also known as copper. At present, the national standard is the best network cable. It is recommended that you try to choose this network cable for monitoring.



Knowing the material, how to choose or identify it?

In addition to buying a better brand at a higher price, if you encounter a merchant who is not kind, you should also test it yourself. The commonly used detection method is to measure the resistance with a multimeter.

A box of network cables is normally 300 meters (actually it should be about 305), and the test resistance of the whole box, the resistance value of the super five types should be 27-30 ohms, and the six types of cables should be around 21-24 ohms.



The reliable transmission distance of the network cable is about 100 meters. Never hear on the Internet that others transmit 120 meters, 150 meters is no problem. The signal will be attenuated and the data packet will be lost when the distance of the network cable assists the transmission. There may be images after 100 meters, but if there is a problem in the future, maintenance will be very troublesome.