Why are the supplier’s network cable quotations very different?
The conductor materials are different. The network cable conductor materials include CCA, bare copper, OFCr, etc. The price of different conductor materials varies greatly;
The wire diameter of the same conductor material can vary. For example, the international common wire conductor wire gauge is 23AWG/24AWG/25AWG/26AWG. The corresponding standard conductor diameter in China is 0.57mm/0.51mm/0.45mm/0.4mm. The conductor diameter used by Chinese suppliers in actual production ranges from 0.32mm to 0.6mm;
Different quality standards, such as passing Fluke test and not passing Fluke test;
The insulating layer and outer sheath of the network cable are made of different materials, new materials or old materials, and the amount of plastic is different. The plastic used in the same box of network cable can vary from 1 to 1.5 kg.
All these aspects will affect the price of network cables. Can you use cheap network cables? It can be used. The local market and customer group of the purchaser should be considered comprehensively to determine how to purchase the network cable of material and quality. The most accurate way is that the customer provides us with samples to evaluate the quotation. Such quotation is the most accurate.
Why are the FTTH quotations of suppliers very different?
Fiber core is the core of optical fiber. The fiber core models are divided into G652/G657.A1/G657.A2/G655, etc. The prices of different fiber cores are different;
There are also qualified cores and unqualified cores produced by core manufacturers. Some manufacturers will treat unqualified cores at low prices. FTTH/FTTB/FTTX produced with such cores can be cheaper than those produced with qualified cores.
The plastic materials for optical cable production are also divided into new materials and old materials, as well as weight. The OD of cheap optical fiber is much thinner and lighter;
The production of FTTH reinforcements is different. For example, the standard of main steel wire is 1.0, but it may also be 0.8. In addition, the steel wire for FTTH production includes galvanized steel wire, coated steel wire, phosphatized steel wire, etc;
The above aspects will affect the price of FTTH. Can the cheap FTTH/FTTB/FTTX Can I use it? The local market and customer groups of the purchaser shall be comprehensively considered. It is better to have detailed specifications to evaluate the quotation.
Why are the prices of RVV/RVS/RVVP/RVSP cables quoted by suppliers very different?
Generally, the conductors of RVV/RVS/RVVP/RVSP are multiple strands copper, with the specification of 0.5mm ²/ 0.75mm ²/ 1.0mm ²/ 1.5mm ²/ 2.0mm ²/ 2.5mm ²/ 3.0mm ²/ 4mm ² For example, some manufacturers may calculate the cost based on the insufficient square, and the mark is 1.0mm ²， Actually, it may only be 0.5mm ²/ 0.7mm ²/ 0.8mm ²/ 0.9mm ²， We once met a foreign purchaser who said that our RVV2 * 1.5mm ² The quotation was expensive. Later, the customer said that the resistance of 1KM measured was 29 Ω. In fact, the standard was 2 * 1.5mm ² The 1KM resistance value of the wire is 13 Ω. It is obvious that the identification 2 * 1.5mm purchased by the customer before ² Cable is actually 2 * 0.75mm ² Can not reach;
In addition, the plastic materials used for RVV/RVS/RVSP/RVVP cables are different from new materials, old materials and the amount of materials used.
Can wires with insufficient square number of conductors be used? This is related to the power of the load required. There is no problem if the power is not used very much. If the power is overloaded too much, the use may be affected by insufficient voltage. If it is serious, it may cause the wire body to heat up and ignite, causing a fire.
What are the conductor materials of the network cable? What characteristics do they have and how do they affect the transmission performance of the network cable?
The conductor materials of the network cable are CCA, bare copper, Standard copper(OFC), etc. The characteristics of different materials are different, and the prices vary greatly.
CCA wire is the cheapest, with poor oxidation resistance, and its service life is the shortest; Take the 24AWG wire gauge as an example for transmission performance. The CCA used for network wire production has two materials. One has a resistance value of about 75 Ω for 300 meters, the longest distance is about 100 meters, and the other has a resistance value of about 50 Ω for 300 meters. The longest distance can reach 130 meters to 150 meters.
The price of bare copper network cable is medium, the oxidation resistance is much better than that of CCA, and the service life is long; For transmission performance, take the 24AWG wire gauge as an example. The resistance value of 300m is about 110 Ω, and the longest use distance is about 80m.
The price of OFC is the most expensive, and it is the best in terms of service life and transmission performance. Take the 24AWG wire gauge for example, the resistance value of 300 meters is about 28 Ω, and the longest service distance can reach 150 meters.
The above distance data are only theoretical values, which are ultimately related to the accessories and connected equipment used, and the actual test shall prevail.
What materials are used for the insulation layer and outer sheath of the network cable? What are the characteristics of these materials?
The conductor insulation layer of the network cable is made of HDPE, and the outer sheath is divided into indoor and outdoor, PVC or LSZH is used indoor, and PE is used outdoor. HDPE is used to ensure the insulation between wire pairs and minimize the signal interference between wire pairs. PVC and LSZH are recommended for indoor use. LSZH has better flame retardancy than PVC when burning, and will not produce much smoke. The outer sheath made of PE is harder and has good tensile resistance. It is suitable for overhead laying, as well as anti mouse bit ,waterproof ,Sun and rain resistance, so it is suitable for outdoor use.
What are the different processes and practices of shielded network cable?
There are two types of FTP (Shielded Foil Twisted Pair) and SFTP (Shielded Foil Twisted Pair) for shielded network cables. There are aluminum foil or woven mesh for shielding inside the shielded network cables, which can reduce radiation and ensure that the system can still maintain good transmission performance under the electromagnetic interference environment. The interference environment will cause the transmission signal of the network cable to be intermittent, or even interrupted, and the signal cannot be transmitted normally. The use of shielded network cables can well resist interference, maintain normal transmission, and have good confidentiality performance. The shielding structure of shielded wiring has an inherent advantage in reducing mutual interference between cables. It can not only shield external electromagnetic signals, but also block the electromagnetic leakage of the cable itself. It will not transmit interference signals to affect the work of other cables, and can prevent information from being eavesdropped.
Shielding works only when the entire cable has shielding devices and both ends are properly grounded. Therefore, the entire system is required to be all shielding devices, including cables, sockets, crystal heads and distribution frames. At the same time, the building needs to have a good grounding system, otherwise the effect may be counterproductive.
The above statement is established on the premise of meeting the standards.
However, there are differences in the actual daily production of the network cable factory. For example, what should have been golden yellow (copper foil) or white (aluminum foil) is actually just a plastic film that does not contain conductive (conductive shielding) materials. Even conductive shielding films have different thicknesses; The shielding network is divided into 48 , 64 , 86 , 98 and 128， The shielding network is made of aluminum magnesium wire, CCA and copper network. These are the real differences, cost differences, and quality standards of shielded wires. Many unprofessional foreign customers are particularly vulnerable to fraud, or they do not meet the quality requirements of the local market and customers, or they think the price is cheap but actually spend money wrongly. We once met a customer who said that our quotation for OFC network cable was very expensive, and that a factory in Shenzhen was very cheap (we also sent samples to them). We estimated that the price of this network cable factory was roughly equivalent to the cost of purchasing copper, excluding plastic and processing fees, so we replied that it was impossible. The buyer said that the samples he received were confirmed to be OFC, The customer finally ordered 2 high cabinets of network cables from another network cable factory. However, all the materials after receiving the goods were CCA. Therefore, when choosing the network cable supplier, each purchaser must make clear the standards he wants, such as material, such as the wire diameter of the conductor, such as the quality standard (whether it passes the Fluke test or fails). Don’t be deceived by the appearance and price. At the same time, consider the reliable network cable supplier. Finally, let me tell you a Chinese saying, “You get what you pay for!”.
How to choose the network cable used outdoors?
It is generally recommended to use PE outer sheathed network cables for outdoor use. PE outer sheaths are more rigid and have good tensile resistance. They are suitable for overhead laying, as well as anti mouse bit, waterproof, Sun and rain resistance. Therefore, they are suitable for outdoor use. In addition, many foreign purchasers can be selected outdoor Cat5e/Cat6 network cable with messenger steel wire.
What are the quality standards of network cables?
The international general quality standards for Cat5e/Cat6 network cables are divided into those that pass the Fluke test and those that fail. The network cables tested by Fluke are basically produced by Standard copper/OFC, which is suitable for large weak current projects or users with high requirements for network transmission speed and stability; There are many network cables that do not pass Fluke’s test. In terms of materials, CCA/bare copper/standard copper/OFC can be used. The production process is relatively simple, and it is suitable for customers who need low prices and do not have high requirements for network transmission. Most of the network cables used in home decoration in China also do not pass Fluke’s test, because the length of the network cables used in home decoration is within 30 meters, There is no difference in the use experience, but the network cables tested by Fluke are required to be used in the network construction of government projects, large buildings, large companies and data center machine rooms.
What are the types of network cables?
The types of network cables can be divided into Cat5e (100M)/Cat6 (1000M)/Cat7 (10Gbps)/Cat8 (40Gbps). In most cases, Cat5e/Cat6 is mainly used.
How can purchasers purchase network cables and optical fibers of different standards according to the local market and demand?
The economic level and network infrastructure level of more than 100 countries and regions in the world are very different, so the demands of purchasers in different countries and regions are different; Even if the purchasers in the same country and region may face different customer groups, the quality standards of the network cables and optical fibers to be purchased are also different. The customer groups are mainly engaged in large-scale projects, of course, they need good products. The quality standards of products mainly for small projects or individual household users can be lower, so this can only be based on the actual situation of the purchasers, As a supplier, what we can do is to be honest and provide our customers with products that match the quality and price. We will not do anything to harm our customers.
What are the outer sheath materials of FTTH/FTTB/FTTX?
The outer sheath materials of FTTH/FTTB/FTTX are PVC/LSZH/PE, etc. The price of each outer sheath is different.
Common types of optical fiber cores are generally divided into G652/G655/G657.A1/G657.A2, etc. However, there are still some models on the market, but they are unqualified cores, because the core manufacturers will have a certain proportion of unqualified cores in the process of producing the cores, which are normally destroyed, but some factories will sell these unqualified cores to the fiber manufacturers at a low price, The optical fiber products produced in this way can be much cheaper. There are many reasons for disqualification, such as unqualified bending rate, unqualified attenuation, unqualified concentricity and diameter of fiber core, etc.
What modes of transportation can we provide?
In most cases, we provide sea transportation services. Shenzhen is the main port. For some countries and regions near western China, we will also use China Europe Express, in addition to air express
Can we provide samples? Is there a charge?
We can provide regular products and neutral samples under normal conditions, and reply to products with special requirements after communication. Generally, the samples are free of charge, and the purchaser needs to pay the air express freight, which is subject to the communication results.
