Other Aluminium Extrusion Products Aluminium ceiling extrusion is a process of manufacturing aluminium ceiling panels by extruding them through a die. Extrusion is a process in which a material is forced through a die to create a specific shape or profile. In the case of aluminium ceiling extrusion, the aluminium is heated and then pushed through a die to create a panel with a specific shape and size. Other Industrial Aluminium Extrusions,High Precision Aluminum Extrusion,Reusable Modular Aluminum Extrusion,Aluminum Profile For Led Strip Lighting Foshan Modern Copper & Aluminum Extrusion Co.,Ltd. , https://www.fmcaarchitectural.com
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What kind of network cable do we need to choose when using POE power supply technology? What aspects do you consider when choosing a network cable?
The non-standard network cable materials in the market mainly include copper clad steel, copper clad aluminum, copper clad iron, etc. These cables have large resistance values ​​and are not suitable for POE power supply. The POE IEEE 802.3af standard requires that the output power of the PSE output port be 15.4W or 15.5W. The PD device receiving power after 100 meters transmission must be no less than 12.95W.
According to the 802.3af typical current value of 350ma, the resistance of the 100m network cable must be (15.4-12.95W) / 350ma = 7 ohms or (15.5-12.95) / 350ma = 7.29 ohms.
The standard network cable is natural to meet this requirement, because the IEEE 802.3af poe power supply standard itself is based on standard network cable. The reason why the POE power supply network cable is required is that many network cables on the market are non-standard network cables, and are not strictly produced according to the requirements of standard network cables.
First, which network cable is most suitable for POE power supply?
The POE power supply must use a network cable made of oxygen-free copper, that is, a standard network cable.
The network cable must be connected to the network cable according to the standard of 568A or 568B. Eight wires must be connected, and the length is required to be within 100 meters. The better the quality of the network cable, the higher the transmission stability, at least the super five network cable. If the budget cost is sufficient, you can choose the 6 types of network cable with longer transmission distance and better effect.
Super Category 5: Super Category 5 has the advantages of low attenuation, low crosstalk, and higher attenuation crosstalk ratio (ACR) and signal-to-noise ratio (Structural Return Loss), and smaller delay error. The Super Category 5 cable is mainly used for Gigabit Ethernet (1000 Mbps).
Category 6 cable: This type of cable has a transmission frequency of 1MHz to 250MHz. The Category 6 cabling system has a large margin at the 200MHz integrated attenuation crosstalk ratio (PS-ACR), which provides twice the bandwidth of the Super Category 5. The transmission performance of Category 6 cabling is much higher than the Category 5 standard and is best suited for applications with transmission rates above 1Gbps.
Another important difference between the six categories and the super five categories is:
Category 6 lines improve performance in terms of crosstalk and return loss, and excellent return loss performance is extremely important for a new generation of full-duplex high-speed network applications. At the same time, the basic link model is eliminated in the six categories of standards. The wiring standard adopts a star topology. The required length of the wiring distance must not exceed 90 m, and the channel length cannot exceed 100 m.
Second, how to identify the true and false of the network cable?
1, look at the material
2, look at the logo of the network cable
3, look at the feel
In addition to seeing, you can also feel the difference in material between the true and false 5/super 5 lines by touching. True 5/Super 5 line texture is relatively soft, mainly to adapt to different network environment needs. Twisted pair cables generally use copper wire as the wire core, which is relatively soft, because some network environments may require the cable to be bent at a small angle. If the wire is hard, it is easy to cause an open circuit. In order to reduce the cost, some unscrupulous manufacturers add other metal elements to the copper in order to make the wires harder, less flexible, and easy to break during use.
4, with a knife
Use scissors to remove the plastic bao skin from the outside of a small line to expose the four pairs of core wires and watch the core wires. True 5/Super 5 line 4 pairs of white in the core should not be pure white, but with the pair of core colors of the white, this is mainly for the convenience of users in the production of crystal The first time distinguishes the pair. The fakes are usually pure white or the color is not obvious.
In addition, there are also differences in the winding density of the 4 pairs of core wires of the true/false type 5/super 5 type line. The true 5 type/super 5 type line has a moderate winding density and the direction is counterclockwise; the false line usually has a small density and the direction may also be It will be clockwise (less), because the fake line is simpler in production and therefore rougher in process.
5, burn with fire
You can test the twisted pair in a high temperature environment to see if the rubber on the outside of the cable will become soft at 35 ° C to 40 ° C. The true cable will not become soft, and the fake will not be necessary; The glue on the outside of the true network cable is flame retardant, while some of the fake ones are not flame retardant and do not meet the safety standards. You may wish to try it when you purchase.
Third, the choice of network cable in practical applications
At present, the selection of network cables is generally unshielded six types of twisted pairs. The super five types of network cables are basically not used. In one project, Xue Ge proposes to select six types of twisted pairs in a unified manner. Unless the cost control is strict, you can choose super five. Network cable, but all are national standards. Especially for long distance network lines, you must choose the national standard.