4-core network cable making graphic analysis (1)

As we all know, the network cable is one of the most basic hardware facilities for us to access the Internet and the most inconspicuous equipment. We are used to purchasing a ready-made network cable. We seldom care about how the network cable is made. We only know that the network cable must be composed of eight cores. When purchasing the network cable, we can check the 8 cores. Is 8 cores required for data transmission? Also, in fact, the four core wires can also help you complete data transmission.

Advantages

1. easy to make and fast.

2. Only four core wires are used, which are not easy to confuse during preparation, so as to avoid damage to the crystal head due to possible suppression errors.

3. Due to its simplicity, patch cords can be used to temporarily create Test Networks, which greatly helps the network management.

Disadvantages

1. Sometimes the transmission is unstable.

2. It is not applicable to large networks.

Application Scope

Compared with the 8-core network cable, the 4-core network cable does not seem to have a significant advantage, but it is very useful in specific scenarios. For example, we can quickly create a patch cord for testing to save time. We often use it when creating short-distance network cables. It is worth noting that the 4-core network cable is only applicable to the widely used MB network.

Charging: Working Principle

To understand the working principle of a 4-core network cable, we need to first understand the working principle of a common network cable. Twisted Pair wires can be divided into three types: Category 3, category 4, Category 5, Category 5, Category 6, and category 7 twisted pair wires. Currently, Category 5, Category 5, or Category 6 unshielded twisted pair wires are common in LAN.

After the twisted pair wires are peeled off, there are eight core wires: green white, green, orange white, orange, blue, blue white, brown white, and brown, generally, all eight core cables are used. There are two international standards for the production of twisted pair wires: EIA/TIA568A and EIA/TIA568B. There are also two main connection methods for twisted pair wires: straight-through cables and cross cables. Simply put, the straight-through cable means that both ends of the crystal head adopt the T568A or T568B connection method at the same time, while the crossover cable adopts the T586A standard at one end of the crystal head and the T568B standard at the other end, that is, 1 and 2 of A crystal head correspond to 3 and 6 of B crystal head, while 3 and 6 of A crystal head correspond to 1 and 2 of B crystal head. Others remain unchanged.

The standard line sequence of T568A is from left to right: 1-green white, 2-green, 3-orange white, 4-blue, 5-blue white, 6-orange, 7-brown white, 8-brown.

The T568B standard line sequence is from left to right: 1-orange white, 2-orange, 3-green white, 4-blue, 5-blue white, 6-green, 7-brown white, 8-brown.

Although the twisted pair has eight core wires, only four of them are used in the widely-used 1st M networks, namely 2nd, 3rd, 6th, and, they play the role of receiving and sending signals respectively. So there is a novel 4-core network cable, also known as the 1-3, 2-6 crossover method, the rule of this cross network cable core line arrangement is: the 1st feet at one end of the network cable are connected to the 3rd feet at the other end, and the 2nd feet at one end of the network cable are connected to the 6th feet at the other end, that is to say, in the above-mentioned method of creating the cross-cable, leave the four extra cables away.