How to buy network cable

In the market, there are many types of Category 5 and Category 5 network cables that are faked with Category 3 or Category 4 cables, and there are also some counterfeit cables.

Now introduce how to distinguish them:

1. Look at the packing: Super Category 5 network cable marked CAT5E words should be 305 meters (1000 feet) per carton, CAT5 is marked with Category 5 lines, packaging is not 305 meters in a box may not be network cable. Marking on the line: The regular manufacturer's product mark is marked with a length. When the project is done, it is convenient to identify how many meters of a box line are used, and how many rice noodles are left.

2, with a multimeter test: National standard network cable 305 meters single-core resistance is about 28 ohms, the market's false over the 5 types of network cable resistance and some even up to 50 ohms, transmission distance shortened by almost one and a half.

3, network cable material: some poor quality network cable 4 pairs of 2 pairs of copper wire 2 pairs of copper wire, used in the computer network is not a big problem, used in the monitoring system will produce interference, you can identify with a magnet.

4, the eyes look: Twisted twisted density should be close to 1CM twisted.

5. Super Category 5 twisted pair is an unshielded twisted pair. Compared with the ordinary Category 5 twisted pair, Super Category 5 twisted pair has less attenuation at the time of transmitting the signal and has stronger anti-interference ability. In a 100M network, the user equipment is only 1/4 of the interference level of a normal CAT5 line.

6, Super five twisted pair is also used four pairs and a tensile cable, the color of the line is exactly the same as five types of twisted pair, namely white orange, orange, white green, green, white blue, blue , white brown and brown. Bare copper wire diameter is 0.51mm (wire gauge is 24AWG), insulated wire diameter is 0.92mm, UTP cable diameter is 5mm.

7. Super Category 5 unshielded twisted pair is a cable that appears after improving the performance of the existing five types of shielded twisted pairs. Many performance parameters, such as near-end crosstalk, attenuation crosstalk ratio, return loss, etc. Improved, but its transmission bandwidth is still 100MHz.

Unshielded twisted pair cables consist of pairs of twisted pairs and a plastic sheath. The five categories refer to the five different quality levels defined by the International Association of Electrical Industries for twisted pair cables.

In addition, it should also be noted that: when used in monitoring systems, the effect of Category 6 cable is better than the Category 5 cable but not much, Category 6 cable is expensive, the volume is not high, so most of the twisted pair video transmitter The transmission distance and parameters provided by the manufacturer are the parameters when using Category 5 unshielded twisted pair. The price of Super Category 5 unshielded twisted pair is similar to the price of Category 5 unshielded twisted pair. Category 5 unshielded twisted pair The performance of the line is much better, so the monitoring project recommends the use of Category 5 network cables.