How to differentiate between dual-screen and unshielded Network cables and dual-screen network cable shielding

How to differentiate between dual-screen and unshielded Network cables and dual-screen network cable shielding

As a part of the Integrated Wiring Design and Construction, the network cable is the basic medium for most information transmission systems. Its importance is self-evident. What is the main role of this article in resolving and shielding the network cable? What is twisted pair wires? What are STP, SFTP, UTP, FTP, and ASTP? What's the cat5e dual-shielded network cable? What is a cat5e single shield network cable? How does one differentiate dual-screen and unshielded Network cables? How can we identify the cat5e line? How can we distinguish between cat6 and cat6 lines?

What is the main function of shielding a network cable?

The blocked network cable is mainly used for environments with strong interference. Interference may interrupt or even interrupt the transmission signal of the network cable, and the signal cannot be transmitted normally. However, the use of shielded Network cables can provide good anti-interference performance, ensure normal transmission, and maintain good confidentiality. The shielding structure of Shielded Cables has inherent advantages in reducing mutual interference between cables, it not only shields external electromagnetic signals, but also blocks the electromagnetic leakage of cables. It does not emit interference signals, affecting other cables and preventing information from being eavesdropped.

In the shielded network cable, there will be a copper wire, that is, the ground line, you can use a shielded RJ45 socket, when used, line at one end of the ground. The ground line can better shield external signals. Shielding a network cable requires good grounding and shielding lines to effectively reduce the impact of strong interference on network signals. Do not use a shielding network cable unless necessary, because it requires high wiring, not only must accessories in the system be shielded, but good grounding is required. If the grounding is poor, the effect will be very poor.

If the grounding point is incorrectly arranged, the grounding resistance is too large, or the grounding potential is not balanced, it will cause grounding noise, that is, a potential difference occurs at a certain point of the transmission channel, in this way, the interference current is generated on the metal shielding layer. At this time, the shielding layer itself forms the biggest interference source, And the wiring requirements of the shielding network cable are strict. All the accessories must be shielded, A good ground-line system is required. In actual construction, it is difficult to fully ground the ground, so that the screen itself becomes the biggest interference source, resulting in performance or even worse than unshielded twisted pair wires.

What is twisted pair wires? Why is it twisted?

(1) twisted pair wires: as a transmission medium, it is made up of two thin copper wires with insulation material.

(2) Why do we need to twenty two wires: Because this mutual winding changes the original electronic characteristics of the cable, this not only reduces the crosstalk, it can also prevent signal interference from other cables to the maximum extent.

The figure shows cat5e twisted pair wires, which are composed of four pairs of twenty wires. There are eight wires in total. Twisted Pair wires are the most common transmission medium in integrated cabling. They are made of two insulated wires that are wound together according to certain specifications, it is an information communication network transmission medium.

What are STP, SFTP, UTP, FTP, and ASTP?

STP: independently shielded twisted pair wires. the aluminum foil layer is added outside the core wire, and each pair of wires has an aluminum foil screen to reduce signal attenuation. Each 4 pairs of cable packages also have a metal braided shielding layer, which has reached the structural standards of seven Network cables. It is suitable for high-speed network and high-Confidentiality transmission. It supports future application updates, unified wiring platform, and multiple media information transmission.

SFTP, in general, there is a two-layer screen, and the two-layer screen must be insulated and isolated. Its advantage is to effectively reduce the environmental magnetic field and signal interference, and reduce the degree of internal signal attenuation. The disadvantage is poor flexibility and high cost. This anti-interference and highly confidential Transmission Wire is applicable to specialized cabling projects in special environments.

UTP: unshielded twisted pair wires. These cables are the most widely used cabling system cables in the general market. They are used for common network applications with transmission bandwidth below MHz and no special performance requirements, the overall performance meets the requirements, the price is low, the construction and maintenance is convenient. However, this type of maximum performance only supports cabling systems with six types of network cables.

FTP: aluminum foil shielded twisted pair wires. It has the advantages of high bandwidth, anti-interference ability, reduced signal attenuation, and no halogen and environmental protection for low smoke recovery.

ASTP: the armored double stranded shielded cable (Cable) is a special double shielded cable. On the basis of the above double shielded cable, the outer layer is the steel armor layer, the steel strip armor layer is grounded at both ends, and the inmost shield is grounded at one end. In addition to the dual-screen effect, the screen has a high intensity and can be used in cabling systems with frequent mouse damage or explosion-proof requirements. Generally, the screen cable is more expensive than the non-screen cable in cost and installation, and the bending performance is slightly worse. However, it is applicable to some special environments and Integrated Wiring of the screen-out system. You can choose to optimize the cost and wiring performance after learning about your situation.

What is the cat5e single shield network cable?

Cat5e single shielded network cable demands the entire system is all shielding equipment, including network cable, modules, crystal head, etc. Compared with cat5e unshielded cable, except for twisted wires and cables, the outer layer is wrapped in aluminum foil to reduce radiation. If the environment used is serious in electromagnetic radiation and strict requirements on data transmission, the cat5e single shield network cable is trustworthy.

What is a category 5 dual-shielded network cable?

The dual-shielded cable is wrapped with an aluminum foil and a metal braided wire in the twisted pair wires. It is suitable for high-speed networks and high-Confidentiality transmission to reduce radiation. This shielding line is suitable for applications of high-frequency signal and string wave signals. It is used for cabling between the user communication terminal and the distribution frame of the residential Integrated Wiring System.

How does one differentiate dual-screen and unshielded Network cables?

The shielded network cable refers to the internal network cable with a shielded layer, and the shielded layer refers to the aluminum foil and woven mesh. The shielding layer of a single shielded network cable has only one layer of aluminum foil. The dual shielded network cable is wrapped in a layer of aluminum foil and a layer of metal braided mesh, the dual-screen and unshielded Network cables are differentiated based on different environments. The dual-screen and unshielded Network cables are mainly used in environments with strong interference. The unshielded Network cables are used in common daily network environments.

(1) Dual shielding: The network cable and unshielded network cable are easily distinguished from the internal structure. Inside the dual shielding network cable, there is a layer of metal shielding network and a layer of aluminum foil, A dual-shielded network cable is also known as a dual-screen network cable. There are only four pairs of Network cables inside the unshielded network cable.

(2) network cable: the internal cable pairs are closely wound in a counter-clockwise direction. twines and twines are conducive to reducing internal crosstalk and external interference, in a common network environment, weak electromagnetic interference does not affect unshielded Network cables. The core wires inside the network cables are twined in two ways, the cable twist distance refers to the length of the pair of twisted wires in the internal line. It is used to indicate the closeness of each pair of wires.

Each pair of wire pairs inside the network cable is twisted in the clockwise direction, and each pair of Twist distance is different. This mutual winding changes the original electronic characteristics of the cable, it can defend against some external electromagnetic interference and reduce crosstalk problems caused by its own signals.

When there is a strong interference in the wiring environment, it will affect the network transmission effect, and serious problems will lead to transmission signal interruption. When the wiring environment has a high-voltage wire or audio equipment's strong electrical flow line, the phenomenon of unstable network transmission signals is even more obvious. In this case, we need to use dual-shielded Network cables to shield strong interference signals to ensure that the network transmission signals are normal.

(3) Dual-shielded network cable: The wiring process is more complex than the unshielded network cable. In the cabling system, all the accessories must be shielded, in addition, a good ground wire system is required. If the ground is not good, the shielding layer will become the biggest interference source. As a result, the performance may even be inferior to that of unshielded twisted pair wires. Therefore, the shielded cable is used only when necessary.

How do we know cat5e lines?

1. View

(1) cat5e lines are printed with CAT 5e.

(2) There are four pairs of twisted pair wires in the leather: blue, blue, orange, orange, green, green, brown, and brown.

(3) The indoor network cable is also lined with twisted pair wires (slashes), or anti-tension ropes for short, to improve the tensile strength of the network cable.

2. Identify

Cat5e Network cables are divided into unshielded and shielded Network cables. The difference is that shielded Network cables are divided into single shielded Network cables (wrapped in twisted pair wires with a layer of aluminum foil) and dual-shielded Network cables (a layer of knitting network is added on the basis of aluminum foil). Shielding Network cables can effectively organize electromagnetic interference from other high-power wires and strong power supplies, greatly reducing the bit error rate of signal transmission, shielding interference.

3. Category

Cat5e network cable materials are divided into a variety of: oxygen-free copper, bronze, copper clad aluminum, copper clad silver, four iron aluminum and so on. Among them, four iron and four aluminum are of the worst quality. Copper Clad aluminum and copper clad aluminum burned immediately in case of fire. After burning, the bronze was cut off immediately and it was also collectively referred to as copper clad copper. The outer layer was wrapped with a layer of oxygen-free copper, and the color and surface of the inside were different when scraping. Oxygen-free copper is the true oxygen-free copper, no matter how many layers of surface and the color of the copper core will not change.

What is the difference between the indoor and outdoor cables of category 5 and Category 5? Can it be used indoors?

In fact, the cat5e network cable is composed of four pairs of twisted wires, cables, and cables. a pe waterproof outer layer is added to the outdoor network, which is mainly used for waterproofing and moisture-proofing, the service life of the cat5e network cable is about 10 years. If the indoor network cable is used outdoors, the service life is generally more than one year.

How can we distinguish between cat6 and cat6 lines?

1. view the structure:

Compared to the cat-5e, there is an insulated cross skeleton in the middle of the Cross skeleton, and the four pairs of twisted wires of the cable are placed in four grooves. This structure can improve the balance of the cable, compared with Category 5 lines, Category 6 lines provide fast and stable performance.

2. view the appearance:

CAT 6 is printed on the cat-5e line, and CAT 5 is printed on the cat-5e line. The copper cores of cat-5e lines are thicker than those of cat-5e lines.

3. Performance:

An important difference between Category 6 and Category 5 is that it improves the performance of crosstalk and ripple loss. In fact, the biggest difference between Category 5 and Category 5 is that Category 5 has greatly improved its performance, there are no tension ropes for Category 5 cables.