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Technical
How to Judge the Quality of Ethernet Cable
We usually use Category 5e or Category 6 cables, but there are several types of cable materials used to meet national production standards. Don't be fooled or tempted by cheap prices when buying cables! 2. Copper-clad Bronze cable refers to a layer of oxygen-free copper plated outside of bronze, so it is also called bronze cable. This type of cable is generally Sold by most manufacturer declaring it as Copper cable, and there are few people who know about it. The conductor of bronze cable belongs to secondary recycled copper, which contains Zinc with Copper becomes Bronze Alloy. The resistance of 100 meters is approximately 40Ω, and it can transmit approximately 80 meters. It has strong oxidation resistance and long service life.
The resistance of bronze is much higher than that of ordinary copper-plated aluminum and oxygen-free copper, so the effective transmission distance of copper-clad bronze is much shorter than copper-clad aluminum. However, the physical properties of copper are relatively stable and not easy to oxidize, so the service life is longer. Although it looks the same on the surface, if burned, the oxygen-free copper layer on the surface of the copper will melt quickly.
Copper-clad aluminum cable
The material of copper-clad cable is a layer of oxygen-free copper wrapped around the copper or aluminum/steel alloy core surface. Because the conductivity of aluminum is worse than copper, the DC resistance of a copper-clad aluminum conductor is larger than that of pure copper conductors. If it is used for power supply, the copper-clad aluminum conductor will cause additional power consumption and a significant decrease in voltage. The resistance of 100 meters is approximately 28Ω, it is cheap and easy to sell, and it can transmit approximately 100 meters. It has poor oxidation resistance and short service life. The tensile strength of copper-clad aluminum is lower than that of copper conductors, so the cable body cannot be forcefully pulled during use.
Why is copper-clad aluminum cable more prone to oxidation.
Oxygen-free copper network cable
We can look at the wire sheath of the copper core. Generally, the outer layer of an all-copper network cable is made of new material, while oxygen-free copper has new material for both the inner and outer sheaths. You can check the gloss and try to pull a section of the wire sheath to see if it can be stretched thinner. A bright gloss indicates new material, and a wire that can be stretched thinner is also new material. However, now all-copper network cables tend to use new materials for both the inner and outer sheaths, so this can only be used as a basic reference.
You can also use a knife to scrape the surface or cross-section: Oxygen-free copper network cable: Scrape off a layer of the surface, and the color is basically the same, and the cross-section color is uniform and undifferentiated. Bronze network cable: Scraping off a layer of the surface reveals a difference in color between the surface and the interior, and there may be some white spots in the cross-section. You can also use fire to burn it. An all-copper wire is coated with a layer of oxygen-free copper on the surface. During burning, the outer layer of the oxygen-free copper will melt. After wiping it with paper, it will be found that the all-copper wire core is difficult to return to its original brass color. On the other hand, oxygen-free copper does not contain impurities, and only the surface oxidizes during burning. After wiping it with paper, it will return to its original yellow color.
According to the standard requirements, the oxygen content in oxygen-free copper wire should not exceed 0.003%, the total impurity content should not exceed 0.05%, and the copper purity should be greater than 99.95%. Therefore, oxygen-free copper has high conductivity, good processing and welding performance, corrosion resistance, and low-temperature performance, making it suitable as a high-quality wire material. The resistance of 100 meters of oxygen-free copper wire is approximately within 10Ω, and it can transmit approximately 120-150 meters. With a long signal transmission distance and low packet loss rate, it is recommended to use oxygen-free copper for network engineering, network HD monitoring engineering, and hidden wire installation in homes, which can ensure network stability, strong oxidation resistance, and long service life.
However, there is a question here: The article mentions six types of wire materials, and two of them, copper-clad silver and oxygen-free copper, have relatively high transmission distances and can theoretically transmit about 150 meters. So which one is better? Under normal usage conditions, the lifespan of copper-clad silver wire is much shorter than that of oxygen-free copper wire. Copper-clad silver wire has poor oxidation resistance and can generally only be used for 4-5 years, while oxygen-free copper wire, due to its high purity and oxidation resistance, can usually be used for more than 10 years. When using copper-clad silver wire, it is important to consider the intended lifespan of the wire.
How to Judge the Quality of Ethernet Cable
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