Nowadays, people usually use CAT5E, CAT6 Cables for IP Video Surveillance Projects.
We usually use the CAT6 Cables for gigabit networks while we usually use the CAT5E Cables for 100M networks .
Here we talk about the national standard CAT5E & CAT6 Cable diameters. The wire diameter of the network cable is available in all kinds of markets, and there are many non-standard ones. The national standard super five wire diameter is 0.5, and the six national standard wire diameter is 0.56. In theory, the thicker the wire diameter, the longer the transmission distance. But the transmission distance is also closely related to the material of the network cable.
The material of the Ethernet Cable :
Common materials on the market: alloy; high-conductivity aluminum; high-conductivity silver; pure copper; oxygen-free copper.
The lowest price of the alloy is iron, and the quality is also the worst.
High-conductivity aluminum is commonly known as copper-clad aluminum, which is mainly aluminum, easy to oxidize, and the resistance will increase after oxidation. This is why the copper clad aluminum network cable is used to install the monitoring, there is no problem when it is newly installed, and there will be occasional signal problems after a while.
The material of high-conductivity silver is also aluminum, and the quality is better than copper-clad aluminum. This is the name, and there is no silver in the material.
The quality of pure copper is better than that of aluminum, but the resistance is still relatively large.
Oxygen-free copper, also called red copper. At present, the best network cable of the national standard, it is recommended that you choose this network cable for monitoring.
Know how to choose or identify the material?
In addition to buying a better brand at a higher price, if you encounter a merchant who is not kind, you have to test it yourself. The commonly used detection method is to measure resistance with a multi-meter.
A box of Ethernet Cable is normally 300 meters (in fact, it should be about 305), the resistance of the whole box is tested, the resistance value of the super five should be 27-30 ohms, and the six types of cables should be about 21-24 ohms.
The reliable transmission distance of the network cable is about 100 meters. Do not hear on the Internet that others transmit 120 meters, 150 meters is no problem. The transmission distance of the signal on the network cable will be attenuated and data packets will be lost. There may be an image after 100 meters, but there will be problems in the future and maintenance will be very troublesome.