Monitoring installation works must identify the quality of the cable.

一、从网线的标识上去辨别

1. Discrimination from the logo of the net

首先，从网线标识上辨别。三类线的标识是“CAT3”，带宽10M，适用于十兆网，目前基本已淘汰；五类线的标识是“CAT5”，带宽100M，适用于百兆以下的网；超五类线的标识是“CAT5E”，带宽155M，是目前的主流产品；六类线的标识是“CAT6”，带宽250M，用于架设千兆网，是未来发展的趋势。

First, it is identified from the line identification. The three type of line is identified as "CAT3", bandwidth 10M, suitable for ten trillion networks, now basically eliminated; the five type of line is a "CAT5", a bandwidth 100M, suitable for a network below 100 megabytes; the identification of the ultra five lines is "CAT5E", the bandwidth 155M, the current mainstream product; the six type of line is identified as "CAT6", bandwidth 250M, used for Setting up Gigabit net is the trend of future development.

其次通过看这个途径我们可以判别大多数假5类/超5类线。真正的5类线在线的塑料包皮上印刷的字符非常清晰、圆滑，基本上没有锯齿状。假货的字迹印刷质量较差，有的字体不清晰，有的呈严重锯齿状。正品5类线所标注的是“cat5”字样，超5类所标注的是“5e”字样，而假货通常所标注的字母全为大写“如CAT5”、“5E”字样。

Second, by looking at this way, we can distinguish most of the fake 5 classes / Super 5 lines. The real 5 types of lines are printed on the plastic wrapping, very clear and smooth, and basically no jagged. The printing quality of counterfeit goods is poor, some of them are not clear, and others are severely serrated. The 5 class lines are marked with "CAT5", and the ultra 5 categories are labeled "5E", and the counterfeit letters are usually marked with the upper case "CAT5" and "5E".

二、从网线的电阻值上去辨别

Two. Discrimination from the resistance value of the network line

这种辨别方法呢是我们采用数字万用表的电阻档或二极管档对网线的相对应芯线进行测量，所得阻值可以根据下面所给的参数进行比较，从而得知网线的好坏。

This method is to measure the relative core line of the wire by the resistance or diode gear of the digital multimeter. The results can be compared according to the parameters given below, thus the quality of the net line can be learned.

超五类全铜的单芯标准阻值为28欧姆，超五类铝的单芯标准阻值为44欧姆，超五类铁的单芯标准阻值为170欧姆，六类全铜的单芯标准阻值为21~23欧姆，相同长度相同线径线缆铁的电阻是铜的7倍，铝是铜的1.7倍

The single core standard resistance of the super five type total copper is 28 ohm, the single core standard resistance of super five type aluminum is 44 ohm, the single core standard resistance of the super five type iron is 170 ohm, the single core standard resistance of six kind of full copper is 21~23 ohm, the same length of the same line diameter cable iron is 7 times that of copper, and the aluminum is 1.7 times of copper.

超五类线整箱的测试电阻值超过30欧姆，就肯定是非铜或线径不足超五类线整箱的测试电阻值超过100欧姆，就肯定是铁的六类线整箱的测试电阻值超过26欧姆，就肯定是非铜或线径不足。

The test resistance value of the ultra five line whole box is more than 30 ohms. It is sure that the test resistance value of thewww.suliaomohe.cn qinhangq.75ix.com shuichulib.75ix.com yinxiangt.75ix.com qhdzmen.75ix.com qiaomaike.75ix.com  non copper or line diameter super five line whole box is more than 100 ohms. It is sure that the test resistance of the six line whole box of the iron is more than 26 ohm, and it is definitely not copper or line diameter.

三、从网线的柔韧性上去辨别

Three. Discrimination from the flexibility of the net line

在这一点上我们可以通过“摸”的方法来感觉其网线的真假质量的优劣。为什么说通过摸也可以辨别它的好坏呢？那是因为质地好的网线一般采用纯铜制作的，而用纯铜生产出来的网线呢在摸上去感觉应该比较软而且手感饱满，可以任意弯曲，弯曲后会慢慢恢复原形，而一些不法厂商在生产时为了降低成本，在铜中添加了其他的金属元素，做出来的导线比较硬，不易弯曲，有凹陷感，弯曲后不易恢复原形在使用中容易产生断线。

At this point, we can feel the true or false quality of the net line by "touching". Why can we distinguish whether it is good or bad by touching? That is because the good texture is made of pure copper, and the wire produced with pure copper feels soft and full of feeling, can bend freely, and will slowly restore the original shape after bending, and some unlawful manufacturers have added other metal elements to copper in order to reduce the cost. The wire is hard, not easy to bend, and has a sense of depression. It is difficult to restore the original shape after bending.

四、从网线的可燃烧性上去辨别

Four. Distinguish from the combustible burning property of the net line

一般来说组成网线的材料必须要求有抗燃烧性，不然的话出现个火灾什么的话，那就损失惨重了。因此大家在选择网线时，一定要检查网线外皮的可燃烧性，以辨别真伪。

Generally speaking, the materials that make up the wire must be combustible, or if there is a fire, it will be a heavy loss. Therefore, when choosing the cable, you must check the combustibility of the mesh outer lining to distinguish the authenticity.

在具体测试时，大家可以先用剪刀切取2厘米左右长度的网线外皮，然后用打火机对着外皮燃烧，正品网线的外皮会在焰火的烧烤之下，逐步被熔化变形，但外皮肯定不会自己燃烧起来；要是发现网线的外皮禁不住烈火的考验，一点就燃烧起来的话，那网线的传输速度再怎么高也应该放弃选择，毕竟这样的网线在布线工程中是很不安全的，使用它会留下很大的安全隐患。

In the specific test, you can first use scissors to cut the length of 2 cm length of the net, and then burn the outer skin with a lighter. The outer skin of the net line will be gradually melted and deformed under the roast of fireworks, but the outer skin must not burn up on its own; if the outer skin of the present net can't stand the test of the fire, A bit on the burning of the words, then how high the speed of the network transmission should also give up the choice, after all, this network line is very unsafe in the wiring project, using it will leave a lot of security risks.

可以找来一段正品网线与伪劣网线，并同时用打火机点燃它们，几秒钟后，正品网线应只是冒白烟并随着时间推移，逐步熔化变形，而伪劣网线不到2秒钟，就会被轻易点燃了，而且伴有大量黑烟产生。

You can find a piece of net line and fake net line, and ignite them at the same time with a lighter. After a few seconds, the net line should just take the white smoke and gradually melt and melt with time, and the fake net line is less than 2 seconds, and it will be easily ignited and accompanied by a large number of black smoke.

五、从网线芯线的成色纯度上去辨别

Five. Discrimination from the color purity of the wire core line

剪开护套外层，将绝缘拔去，剪开导体一小节观察看横截面铜色是否均匀，如果是纯铜，就会呈均匀黄金色；但如果里面参杂了铁或铝，或者其他合金则可看到明显的白色杂点或黑色。

Cut off the outer layer of the sheath, pull the insulation out, and cut the conductor a small section to see whether the cross section copper is uniform. If it is pure copper, it will be even golden, but if the inside is mixed with iron or aluminum, or other alloys can see obvious white miscellaneous points or black.

另外，用阳火烧导体铜的表面会呈现外色变黑而内色仍是不变的黄色，擦去烧完变黑的部分后铜仍保持原来的颜色；但如果含铁无论你怎么擦它都是暗淡的黑色。判断网线是否夹杂铁，可以剪一小段铜芯，去除包住的塑料，看是否能用螺丝刀提起就行了，因为螺丝刀头带有磁性，如果是纯铜则无法吸附，掺杂铁后则不同，假货掺杂铁可降低成本，但会引起电缆电阻不匹配，会缩短传输距离、降低传输速度.

In addition, the surface of the copper with the sun fire will be black and the inner color is still the same yellow, and the copper remains the original color after the blackened part is burned, but it is dark black if you wipe it no matter how you wipe it. Judging whether the wire is mixed with iron, you can cut a small piece of copper core, remove the wrapped plastic and see if it can be raised with a screwdriver, because the head of the screwdriver is magnetic. If it is pure copper, it can not be adsorbed, and the doping iron is different. The adulterate iron can reduce the cost, but it will lead to the cable resistance mismatch and shorten the transmission. Distance, reduce transmission speed.