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Views: 17 Author: Elsie Publish Time: 21-11-2018 Origin: Site
Correctly identify five types of twisted pairs edit With the introduction and implementation of the Fast Ethernet standard,
Category 5 twisted pair lines have begun to be widely used in network cabling.
However, due to the misleading propaganda of individual manufacturers and network companies,
and the lack of necessary understanding of relevant standards by some network users,
it is difficult to distinguish between the five types of twisted pairs and the overwhelming.
However, once the five types of twisted pair cables that do not meet the standard are selected,
the overall performance of the network will be degraded, and on the other hand, the hidden dangers of future network upgrades will be buried.
In addition to twisting the two insulated copper conductors that make up the twisted pair,
the pairs in the standard twisted pair cable are twisted in a counterclockwise direction.
Otherwise it will cause a mismatch in cable resistance and limit the transmission distance.
TIA/EIA 568A (TIA/EIA 568 is a cabling standard established by ANSI in 1996 that specifies
the network cabling infrastructure, including cables, connectivity equipment, etc.
The letter "A" indicates IBM's cabling standard, and AT&T uses the letter "B" to indicate the specific provisions in .
Ethernet uses only two pairs (4-core) of wires to transmit and receive signals when using twisted pair
as the transmission medium. There are three standards in Fast Ethernet that use twisted pair
as the transmission medium: 100Base-TX, 100Base-T2, and 100Base-T4.
Among them: 100Base-T4 requires the use of all 4 pairs of lines for signal transmission,
and the other two standards only require 2 pairs of lines. The most popular in Fast Ethernet is the 100Base-TX standard.
The American Cable Standard (AWG) defines 4 pairs of Category 3, 4, 5 and Category 5 twisted pairs.
In the Gigabit Ethernet, it is required to use all 4 pairs (8 cores). Communicate.
Therefore, there should be 4 pairs of wires in the standard Category 5 cable.
Twisted pair is divided into three categories: four, four, five, super five, six, seven, eight, etc.
according to the specifications proposed by TIA and ISO.
Type, different specifications have different electrical properties. In principle, the bigger the number,
the newer the version, the more advanced the technology, the smaller the crosstalk, and the wider the bandwidth.
Of course, the price is more expensive.When selecting the wire for the LAN,
you should use the appropriate twisted pair or fiber according to the actual situation,
but it should be more than five types of specifications, because the three or four types of twisted pair
are generally used in 10M/bps Ethernet. In the network, five types of twisted pairs can meet the increasingly popular 1000Mbps Ethernet,
but the upgrade potential is small. The Super Category 5 line not only has a price advantage, but also has more stability and potential.
The six types of twisted pair are mainly used for Ethernet of Gigabit and above, and also used in
other high-speed networks (such as ATM networks) with an effective distance of 200 meters.
There are seven types and eight types of twisted pairs, all of which are shielded twisted pairs for 10 and 25 Gbp respectively.
Eight types of lines data transmission, its rate is comparable to the shoulder fiber, but due to the high specification of the cable,
such twisted pair needs more considerations in the difficulty and cost of layout, and they also compete with the fiber in the data center.
The three types and four types of lines are almost absent in the market. If there are, they are not in the third or fourth category.
Instead, they are sold in five or even five categories. This is the largest number of fake five types. Kind.
Commonly used in general LANs are Category 5, Category 5 or Category 6 unshielded twisted pair cables.
In particular, Category 5 and Category 6 unshielded twisted pair cables can easily provide 1000 Mbps of communication bandwidth
and have an upgrade to 2.5-10 Gbps. The bandwidth potential, therefore, is the cable of choice for today's horizontal cabling.
Most local area networks use UTP-Unshielded Twisted Pair as the transmission medium for wiring. The network cable consists of
a long-distance twisted pair and an RJ45 head.
The label for the Category 5 line is “Cat.5”, the label for the Category 5 line is"Cat.5e", which is the mainstream product;
the label for the Category 6 line is “Cat.6”. The same as above.
