It is well known that web lines are connections between computers and computers, computers and other network equipment, typically made of metal or glass, with common web lines with double winch and coaxial cables.
Ethernet lines can be divided into two lines.Class lines, three lines, four linesThere are a variety of types, such as five, six, seven, but not everyone knows the difference between them in the comparison between the various lines, so many are confused about what Ethernet cables should be used for their networks.
Classification of web lines
(1) Double winch
The English name of the double winch is Twisted Pair. It is the most common transmission medium in integrated wiring.
The double winch used a pair of mutually insulated metal steering lines to resist electromagnetic wave interference below 25 MHz. The two insulated copper conduits are hung together at a certain density, which reduces the degree of signal interference, and the electrical waves from each of them are offset by those from the other. This is why the name of the “two winch” came.
The line is usually hung by a pair of 22-24 insulated copper steering lines, which, when actually used, binds multiple sets of winches together in an insulation cable shield. The typical double winch is four pairs and more pairs are placed in a cable tube. These are what we call double winch cables. In the dual winch cable (also known as the two-wire cable), the length of the different lines varies. The more dense the general twister is, the greater its resistance to interference, and the two winch is limited in terms of transport distance, length of channel and speed of data transmission compared to other transmission media, but less expensive.
The two winch lines can be divided into two winch lines (STP = Shield Twisted Pair) and two winch lines (UTP = Unshielded Twisted Pair).
STP
STP has a double winch line with one or more layers of shielding, which reduces electromagnetic interference during data transmission, thus making it more stable.
UTP
The UTP does not have a shield in it, so it is less stable, but its advantage is to be cheap. (b) Unshielded coats, small diameters, saving space occupied; Lightweight, bendy, easy to install;
Double winch lines are classified according to ISO/IEC 11801 and are common in three categories, five and more than five, six, seven and seven. The former are fine and the latter are thick, the size of which is as follows:
- Category I: Mainly for transmission of voice (type I standards, mainly for telephone cables prior to the early 1980s), unlike data transmission, has been phased out.
- Category II: transmission bandwidth of 1 MHz for voice transmission and maximum transmission rate of 4Mbps, commonly found in the old Token Ring, which uses 4Mbps to regulate transmission protocols.
- Three types of line: the cable's transmission bandwidth of 16 MHz, which is used for voice transmission and for data transmission with a maximum transmission rate of 10 Mbps, is used mainly for 10BASE-T and is used as the lowest level of use by ANSI/TIA-568.C.2.
- Four categories: The transmission bandwidth of this type of cable is 20 MHz, which is used for voice transmission and the maximum transmission rate of 16Mbps, mainly for token-based local area networks and 10BASE-T/100BASE-T, and has been standardly phased out.
- Five types of cable: this type of cable increases the density of the circuit and transfers a bandwidth of 100 MHz for voice transmission and data transmission with a maximum transmission rate of 100 Mbps, mainly for 100 BASE-T and 10BASE-T networks, which have been replaced by more than five types of lines.
- Over five types of lines: reduced decay, fewer serial disturbances, increased near-end serial power and test requirements compared to five lines, and had a higher decay serial disturbance ratio (ACR) and a smaller time delay ratio, with a significant increase in sex. The maximum bandwidth of the ultra-five lines is 100 MHz.
- Six-class lines: The transmission bandwidth of this type of cable is 250 MHz, and the combined decay string disturbance ratio (PS-ACR) of six-class wiring systems should have a larger amount at 200 MHz, which provides two times more bandwidth than five classes. The transmission performance of six types of wiring is much higher than that of more than five categories and is most suitable for the application of a 1Gbps transmission rate. An important difference between the six categories and the more than five is that improved performance in the areas of serial disturbances and backwave depletion is essential for a new generation of full-time high-speed network applications.
- Supersix lines: Supersix lines, an improved version of six lines, were published in 2008 and are also a double winch cable, as defined in the ANSI/TIA-568C.2 and ISO/IEC 11801 supersix/EA standards, mainly for use in terabytes networks. The transmission frequency of 500 MHz, with a maximum transmission speed of 10 Gbps, has improved considerably, inter alia, in the form of external serial disturbances.
- Seven Class Lines: This Line is a double winch line that was endorsed in 2002 in the ISO/IEC 11801 7/F Level Standard, mainly for adaptation to the application and development of terabytes of Ethernet technology. However, it is no longer a non-shield winch, but rather a shielded winch, so it can transmit at least 600 MHz at 10 Gbps.
Note: The network line from home routers to computers is generally not longer than 50 metres, but it does not have problems with the network length from a small area or residential building to a residential unit of 100 metres. The network line above 90 metres can cause network signals to decay, increase interference along the road, make transmission data prone to errors, thus creating a sense of slowness for Internet users, such as jamming, web-page errors, etc., but the actual speed of the network (data transmission) is not slowing, except when the data is wrong and the web detection mechanism requires the error frame to be sent back.
(2) Coaxial cables
Coaxial cables, which are a layer of insulation, are wired around the central copper conductor. It is characterized by good intervention resistance, stable transmission data and cheap prices, and is also widely used, such as closed-circuit television lines. It is not too expensive to sell a few metres on the market for the same line. Axle cables are used to connect to the BNC head, and the same cable that is sold on the market is generally a finished product that has been connected to the BNC head and is available for direct use.
(3) Cable
The cable is now the most advanced network, cheap and widely available. It is made up of many thin glass fibres, i.e. fibre-optic insulation. Because of the light wave transmission, it is characterized by extreme resistance to electromagnetic interference, high confidentiality, speed, high transmission capacity, etc.
Fibres divided into single and multi-module fibres. Owing to the reliance on lasers or LED light sources for transmission, port cleaning requirements are high, and ordinary dust and fingerprints can lead to a significant loss of fibre-optic transmission and even disruption of communications.
II. Distinction between materials:
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