At present, twisted pairs commonly used in local area networks are generally unshielded type 5 pairs (ie, 8 wires) of cable. These twisted pairs have a transmission rate of 100 Mbps.
The 3 types of twisted pair outer layer of protective rubber on the market are thin, the words "CAT3" are marked on the rubber, the "3 types" are marked on the outer packaging, and the price is lower; the 5 types of twisted pair outer protective rubber is thick. The word “CAT5” is marked on the rubber, and the “5 categories” are marked on the outer packaging carton. The price is higher. Don't buy low-quality Category 5 twisted pair cables when you buy them. These products can only be used as Category 3 twisted pair cables.
Super Category 5 twisted pair is an unshielded twisted pair. Compared with the common Category 5 twisted pair, the Category 5 twisted pair has less attenuation and stronger anti-interference ability when transmitting signals. In a 100M network, the user equipment is interfered by only 1/4 of the ordinary Category 5 cable, which is an ideal solution for network applications.
"Super five" refers to the super five unshielded twisted pair (UTP-UnshieldedTwistedPair)
The unshielded twisted pair cable consists of multiple pairs of twisted pairs and a plastic sheath. The five categories refer to the five different quality levels defined by the International Electrical Industry Association for twisted pair cables.
The super five unshielded twisted pair cable is a cable that appears after improving some of the performance of the existing five types of shielded twisted pair. Many performance parameters, such as near-end crosstalk, attenuation crosstalk ratio, and return loss, are available. Increased, but its transmission bandwidth is still 100MHz.
The super five twisted pair cable also uses four winding pairs and one tensile cable. The color of the pair is exactly the same as the five types of twisted pair, which are white orange, orange, white green, green, white blue, blue and white. Brown and brown. The bare copper wire diameter is 0.51mm (wire gauge is 24AWG), the insulated wire diameter is 0.92mm, and the UTP cable diameter is 5mm.
Super Category 5 twisted pair cables are typically only used in 100 Mb/s Fast Ethernet for desktop switch-to-computer connectivity. If you want to upgrade your network to Gigabit Ethernet in the future, you can use Super Category 5 unshielded twisted pair in horizontal cabling. Super Category 5 unshielded twisted pair cables can also provide transmission bandwidths of up to 1000 Mb/s, but often rely on the support of expensive special equipment.
Super five or six
"Six categories" refers to six types of unshielded twisted pair
The parameters of the six types of unshielded twisted pair cables have been greatly improved, and the bandwidth has also been extended to 250 MHz or higher. The six types of twisted pairs are different in appearance and structure from the five or five types of twisted pairs. They not only increase the insulated cross skeleton, but also place the four pairs of twisted pairs on the cross skeleton. Within the grooves, and the diameter of the cable is also thicker.
The cross skeleton at the center of the cable rotates with the change of the length, and the four pairs of twisted pairs are stuck in the grooves of the skeleton to maintain the relative positions of the four pairs of twisted pairs, thereby improving the balance characteristics of the cable and the crosstalk attenuation. In addition, it is guaranteed that the balanced structure of the cable is not damaged during the installation process. The six types of unshielded twisted pair bare copper wire diameter is 0.57mm (wire gauge is 23AWG), the insulated wire diameter is 1.02mm, and the UTP cable diameter is 6.53mm.
According to different electrical properties, twisted pairs can be divided into three types, five types, super five, six and seven twisted pairs. The price difference between different types of twisted pairs is large or even disparity, and the application range is also very different.
In addition to the traditional voice system still using three types of twisted pair, network cabling is currently basically using Category 5 or Category 6 unshielded twisted pair. Although the five types of unshielded twisted pair cables can still support 1000Base-T, they are gradually fading out of the wiring market because they are almost the same price as the super five unshielded twisted pair.
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