The network cable used in household wiring is generally not very long, most of them are within tens of meters, so the electrical performance requirements for the network cable are not as extreme as the enterprise-level commercial solution, but in the current network environment with serious information pollution, there are still many big holes when purchasing.
Considering that there are many second-hand knives on the Internet now, everyone should keep their eyes open and pay attention to the following points. Friends who don't have the patience to read it can pull it to the end to read the summary.
1. Don't be fooled by some big cleverness, what kind of super six network cables, or even seven or eight types of shielded network cables, are all pitfalls
It's all 2024, and there are still people who take the rumors that the super Category 5 line can only run 1000Mbps, and the Category 6 line can run exactly 1000Mbps?
You can see this kind of nonsense information everywhere in the picture above, I just want to say that one of these people is a pit, and the words are all copied, and they must not have actually tested it themselves.
I use the CAT5e cable to test the speed between PC and NAS, and I can run more than 9Gb/s, who said that CAT5e is less than gigabit???
In fact, at most, the length of twenty or thirty meters at home, even if the CAT5E super five line that meets the standard can basically run the 10 megabit intranet, even if you take into account the first decoration, you want to leave room for future network expansion, then at most it is enough for the ordinary CAT6 category 6 network cable, and it can support the full 10 gigabit within 55 meters.
In addition to spending more money, the so-called super six, seven, and eight network cables have not improved at all in the actual use process.
Except for a few professional enthusiasts, how many friends will deploy more than 10 Gigabit LAN at home? If you really want to play with a network card like 40G, isn't it fragrant to use a light mouth? The temperature of the electric port network card can make your hands burn.
And there is another problem, brothers who may not have experienced it may not necessarily take into account that the diameter of these wires of more than six specifications is very thick, and it is difficult to wear two in a 16mm diameter threading pipe, let alone three.
A few years ago, when I first started to decorate, I bought the national standard six types of wires, and then I was embarrassed to find that the threading pipe was too thin, at most it could only be worn into 2 lines, and it was impossible to place the main route in the living room with a 3-wire wiring scheme, which was very troublesome.
Looking back, I was deceived by the rumor that the super Cat5 line could only run gigabit at most, and I regretted it.
The most excessive thing is that there are two knives to fool novices, and buy seven or eight types of shielded wires without global grounding shielding, which is not stupid or bad, but everyone knows that this kind of thing is not suitable for home use at all.
Category 7 and Category 8 shielded wires are not only expensive crystal heads, plug-in panels, and network wiceps, but also we can see that the inside of the shielded wires is covered by aluminum foil, and the shielding grounding of the whole link needs to be done in the process of use in order to really play an anti-interference effect. This point can refer to the relevant article of the "iN in" boss, which is introduced in detail.
Like the crystal head of an eight-class line in the figure below, there are dozens of pieces, which are clearly prepared for enterprise-level application scenarios, and they are really not needed for home use.
The price of network cable is also several times that of ordinary super Category 5 and 6:
Let's take a look at the crystal head of the seven types of wires, which is also metal, just for grounding shielding. How many families will do this professional project in order to experience 0 improvement, and the contractor team will really do seven or eight types of wall plug panels for shielding wires. . .
Besides, where does there be so much electromagnetic interference in the home? Can we use shielded wires to resist interference? This is a residential environment, not a commercial computer room full of machines.
The so-called CAT6E pseudo-super six line does not even have a corresponding national standard, and it is purely the business itself according to the name of the CAT5E super five line to deceive people. The model of the CAT6A cable is CAT6A.
Even if it is the so-called seven categories and eight types of lines, because many products are mainly sold to those who are not familiar with network knowledge and are fooled, so even the quality may not be up to standard.
Therefore, if someone recommends shielded wires and CAT6E wires to ordinary home users, it is not wrong to see one blacked out and the other.
If you really have the intention of fighting the future, and want to reserve room for upgrading the weak current system at home, it is better to bury the optical fiber in advance at the beginning.
2. Try to avoid buying flat wires and thin wires, and it is best to choose traditional twisted pairs
If you have made a network cable, you will know that there will be 8 cores in the normal network cable, of which two by two are twisted together into 4 strands, and the spacing of the six types of wires is also denser than that of the five and super five lines, which is why the network cable is also called a twisted pair.
The twisting of the wire core in pairs is not because the manufacturer and the engineer are idle, but because it can really reduce the electromagnetic interference between the cores. However, all the specifications of the wire that meets the national standard, the metal core, the core insulation, the outer skin of the network cable and the internal cross tensile skeleton are numerous.
If you look at some of the flat wires and thin wires on the market, for the so-called aesthetics, they obviously do not meet the normal production standards, then there will definitely be some costs in terms of actual electrical performance.
There may be no problem when the jumper is used in a short distance, but if it is enlarged to a length of tens of meters through the wall, it may cause some network failures, so it is best to avoid it when we buy.
Like the following picture, a network cable like a thin dog, more than 2 meters, I just refuse:
Unless you really want to save space, this kind of flat wire is also directly shaken when you see it:
A certain treasure also has this kind of flat + shielded so-called 8 class line, which directly fills up the Debuff, and whoever buys it is a big injustice.
3. When buying network cables, remember to buy well-known brands that meet the national standard, and try to choose copper wire cores
There are still a lot of cats in the network cable industry, because the raw material of the wire core is made of metal, and there are always traitors who will be shoddy in it. Therefore, we try to buy the network cable during the decoration ourselves, don't try to save trouble and let the contractor purchase, God knows if the foreman will buy a bunch of aluminum core garbage at a good price to make you the difference.
Everyone knows that the performance of copper wire is much better than that of aluminum, so the signal attenuation caused by use is also small. According to the electrical performance, the material of the network cable core from best to worst is as follows:
Oxygen-free copper> pure copper (bronze) > copper-clad aluminum> aluminum
When we buy, try to choose oxygen-free copper and pure copper, especially oxygen-free copper, and don't buy any copper-clad aluminum and pure aluminum network cables. Although the signal attenuation effect in a short distance may not be obvious, why buy defective products if there are good products, right?
In addition, the aluminum wire core not only has the problem of high resistance, but also is easy to oxidize in the air compared to copper, and there may be poor contact after long-term use.
Generally, the serious brand will identify the material of the network cable.,Dare to mark how much or rely on a little spectrum.,It's really a loss to lose a fake one.。 Although the price of an engineering line like Haikang is not cheap, it is still much more reassuring to write that oxygen-free copper is written, and the brand is hard enough, which is very good.
And the following picture of this copper-clad aluminum network cable highlights a cheap, thrifty by people, in fact, the requirements are not high, it can be used, and the bad people are clearly written and understood:
Fourth, the network cable is important, and the crystal head and wall socket are equally important
There are many friends who only pay attention to the quality of the network cable when they carry out weakness transformation, and often ignore the inconspicuous crystal head and wall socket, which is actually wrong.
After all, the weak current network within the home still follows the barrel principle, and if there is a poor contact or signal on the entire link, the overall network quality will be affected.
Anyway, the crystal head and network cable socket are not expensive, it is better to buy some good, so as not to have the trouble of going back and troubleshooting after a long time of network failure.
Take the crystal head as an example, if the novice is not very good at making his own network cable, it is recommended to buy this two-piece or three-piece crystal head, which greatly reduces the probability of failure:
For wall sockets, if it is more expensive to buy a finished product, you can choose a cheap blank panel, and then use it with this kind of wire-free use, which costs less money and is easy to wiring:
Of course, if the technology is good, you can also choose the module of normal wiring, and the price can be lower.
summary
1. Home decoration network, choose CAT5 super five network cable or CAT6 six network cable is enough, remember to buy unshielded wire, don't buy shielded wire.
2. Try not to buy flat wires and ultra-fine wires for long-distance wiring, just buy ordinary network cables in accordance with the rules.
3. Buy a network cable to look at the core material, give priority to oxygen-free copper, and then buy pure copper, don't buy copper-clad aluminum or aluminum core.
4. If you want good network quality, not only the network cable should be good, but also the crystal head and wall plug panel should be bought better, which is more secure.