How to choose network jumpers in network wiring
I believe you are not unfamiliar with jumpers. In the local area network (LAN), we all use jumpers to realize data transmission, and the quality of the jumpers used seriously affects the transmission efficiency of the network and the stability of the network. So, how to choose network jumpers for network wiring?
1. How to choose network jumpers in network wiring
1. On-site production jumper
The cables used to make jumpers on site are generally leftover wires from horizontal wiring. The conductor structure of the horizontal cable is a solid core conductor. Cat5e uses AWG24 (1/0.511mm), and Cat6 uses AWG23 (1/0.574mm) bare soft copper single wire.
The cable of this structure is relatively hard and has poor flexibility, and it is difficult to manage the cable on site. In addition, because the crystal head installed on site is crimped with a hand-pressing simple crimping tool, the crimping reliability of the crystal head gold piece and the solid core conductor has a great relationship with the operation of the crimping operator. The performance of the jumper produced on site , Using FLUKE to select the jumper single test, the performance of RL and NEXT is very different, and the reliability of the mechanical connection point is obviously worse than that of the brand product jumper.
2. Brand finished jumper
The standard requires that the cable conductor of the finished jumper is AWG26 (7/0.16mm) or AWG24 (7/0.20mm) bare soft copper stranded wire. The cable of this structure is relatively soft and has good bendability, which ensures that the jumper is very convenient during use. At the same time, because it is a stranded copper wire, it is easier to manage the wire on site. Use FLUKE to select the jumper single test, the performance margin of RL and NEXT exceeds the TIA568B standard before leaving the factory.
Since the finished jumper belongs to the same brand as the network cable and connecting hardware, it is easier to keep the characteristic impedance of the entire channel consistent, so as to obtain the ideal RL value.
3, the market to buy jumpers
Due to the variety of channels for patch cords purchased in the market, users who are not very professional about patch cord products may even buy patch cords made on site. Even if you buy a brand jumper, it may be a "copycat" product.
At a project site, it was found that the jumper cable used by the customer for testing is a 5/0.16mm stranded aluminum wire, and the jumper is identified as a product of a well-known brand. Using FLUKE to select a single jumper test, the performance margin of RL and NEXT are almost all less than -10.0dB, which is obviously a fake and shoddy product, and it is also a problem that is easy to encounter when buying in the general market.
2. What is the difference between a network jumper and a network cable?
1. The meaning of network jumpers and network cables
The jumper is actually a metal connecting wire that connects the two demand points of the circuit board (PCB). Due to different product designs, the jumper uses different materials and thicknesses. Most jumpers are used for voltage transmission at the same potential, and there are also reference voltages for protection circuits. For those with precise voltage requirements, the voltage drop generated by a little metal jumper will also have a great impact on product performance.
b. network jumper
A small switch that controls the flow of current on a circuit board. Its function is to adjust the on-off relationship of different electrical signals on the device, and to adjust the working state of the device, such as determining the motherboard voltage, the master-slave relationship of the driver, etc.
The network jumper basically consists of two parts, one part is fixed on the motherboard, hard disk and other equipment, and consists of two or more metal jumpers; the other part is the jumper cap, which is a movable part, The outer layer is insulating plastic, and the inner layer is conductive material, which can be inserted on the jumper pins, and the two jumper pins are connected. We call it ON; otherwise, when the jumper cap is not buckled, it means that it is disconnected, which is called OFF.
2. The difference between network cable jumper and network cable
a, different materials
Jumper: The jumper is actually a metal connecting wire that connects the two demand points of the circuit board (PCB). Due to different product designs, the jumper uses different materials and thicknesses. Most jumpers are used for voltage transmission at the same potential, and there are also reference voltages for protection circuits. For those with precise voltage requirements, the voltage drop generated by a little metal jumper will also have a great impact on product performance.
Network cable: To connect to a local area network, a network cable is essential. The common network cables in the local area network mainly include twisted pair, coaxial cable and optical cable. Twisted pair is a data transmission line composed of many pairs of wires. It is characterized by low price, so it is widely used, such as our common telephone lines. It is used to connect with the RJ45 crystal head. It has two kinds of STP and UTP, we commonly use UTP.
b. Different functions
Jumpers are usually used to short-circuit and connect two wires, while network cables are usually used for data transmission.
How to select network jumpers in network wiring, I believe that everyone has a certain understanding of this. The function of the network jumper generally refers to the assembly of the jumper frame. It is after your line is installed. If the line needs to be changed, there is no need to re-route the wire, but directly modify the corresponding path on the jumper frame to achieve the purpose of changing the line.