There are many types of network cables. If you distinguish them according to the application scenario, you can divide them into outdoor and indoor network cables, shielded and unshielded network cables. Then, there will be many friends who will have doubts. What is the difference between shielded jumpers and unshielded jumpers? What is the role?
First, what is the difference between shielded jumpers and unshielded jumpers?
Shielded cable (shielded twisted pair), the outer layer of the shielded cable is wrapped in aluminum to reduce radiation but does not completely eliminate radiation. The price of the shielded cable is relatively high, and it is more difficult to install than the unshielded cable. Similar to coaxial cable, it must be equipped with a special connector that supports shielding and corresponding mounting technology. But it has a higher transmission rate and can reach 155Mbps within 100 meters. The price is relatively high and requires special connectors that support shielding and comparable mounting techniques, but at a higher transmission rate than the corresponding unshielded twisted pair.
The unshielded network cable is divided into 4 pairs by 8 differently colored wires. The effect of paired twisting is to minimize the influence of electromagnetic radiation and external electromagnetic interference. In the EIA/TIA-568 standard, twisted pairs are classified into three types: four types, four types, and five types of lines. The three most commonly used types in the network are the three types of lines and the five types of lines. Currently, there are more than six types.
Second, what is the role of shielded jumpers and unshielded jumpers?
The unshielded network cable is mainly used in the network without interference, so the shielded network cable is relatively used in an environment with interference. The unshielded network cable has no shielding layer. Its diameter is relatively small, and it is space-saving. It can be used in an environment without interference, which is not only convenient to use, but also saves space when wiring.
When indoors, our interference source is generally not very serious. The transmission speed of the unshielded network cable is actually faster than the shielded network cable. If the spatial structure of the wiring is close to the interference source of the air conditioner, the shielded network cable is used.
In terms of price, the price of the unshielded network cable is lower than the cost of the shielded network cable. Some people may ask, the transmission speed is obviously better than the unshielded network cable, why the price is low, but the price of the network cable is not completely determined by the transmission speed.
The shielded network cable exists in order to cope with the environment with interference sources, so its cost is relatively high, and it is also difficult to wire.
Therefore, the price of the unshielded network cable and the shielded network cable differs in this layer of shielding function, but not all shielded network cables are used in the electromagnetic environment. In fact, in the ordinary electromagnetic environment, we can use the unshielded network cable to deal with it. Normally, there will be no problem. According to the environment, the network cable can be used to make the wiring scheme better. Cost savings and easy wiring are the first priority.
In fact, the difference between a single shielded network cable and a double shielded network cable is that the double shielded network cable has a more shielding layer than the single shielded network cable. In fact, it can be seen from their names. And double-shielded cable transmission speed than a single shielded cable is slower.
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