The role of the network cable is mainly used to connect to the local area network. The classification of the network cable mainly includes twisted-pair cables, coaxial cables, and optical cables.
At present, we refer to the network cables mentioned in the project, which mainly refers to twisted-pair cables. Twisted pair is a data transmission line made up of many pairs of wires. Its characteristic is that it is cheap, so it is widely used.
Twisted pair uses a pair of metal wires insulated from each other to resist electromagnetic interference below 25MHz. Stranding two insulated copper conductors to each other at a certain density reduces the degree of signal interference, and the electromagnetic waves emitted by each conductor during transmission are cancelled by the electric waves emitted from the other conductor. In general, the denser the strands are, the stronger their anti-interference ability is.
Twisted pair can be divided into shielded twisted pair (STP) and unshielded twisted pair (UTP)
Twisted pair classification
According to the ISO/IEC 11801 standard classification, there are five types of lines, five types of lines, six types of lines, seven types of lines and seven types of super seven lines.
The transmission speeds of Category 5, Category 5, and Category 6 are between 100M and 1000M, which can meet the needs of most of our monitoring projects. Therefore, they are widely used in various monitoring projects (the current five categories are also Gradually replaced by the Super Category Five line).
On the other hand, over six types of network cables and above have better performance but are more expensive.
The difference between five types and six types of lines
The main difference:
The most fundamental difference is that the twisted degree of two cores in each twisted pair is different. The twisted degree of Category 6 twisted pairs is higher than that of Category 5. Twisted pair transmits differential signals, each pair. The tighter the strands in the core, the smaller the interference between each pair, and can work at a higher frequency.
Of course, there are minor differences. For example, there are cross keels in the category six lines, and there are none in the five categories.
The identification of the quintessential line is "CAT5" with a bandwidth of 100M and is suitable for network transmission below 100M;
The CAT5E logo is the current mainstream product;
The six-line logo is "CAT6" and is mainly used to set up Gigabit networks.
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