The ultimate transmission bandwidth of the wire, and the ultimate transmission speed of the network

The transmission bandwidth refers to the passband bar. There is no direct relationship between the bandwidth you mentioned and the resistance of the wire. Resistance affects the current.

And what affects the transmission frequency is the equivalent capacitance of the wire. In circuit signal transmission, two or more wires are usually used. The wire is separated from the wire by an insulating medium.

So it is equivalent to one capacitance (distributed capacitance or equivalent capacitance). And this capacitance is equivalent to parallel between the signal lines. The capacitance is the same as the high frequency resistance and low frequency.

So in general. This equivalent capacitance forms a large capacitive reactance to low-frequency signals. Therefore, it does not affect.

The higher the frequency of the same pass, the smaller the capacitive resistance. The signal loss in the transmission line increases. So the high-frequency transmission capability is attenuated.

Now it's about what this distributed capacitance has to do with it. Directly speaking, it is directly proportional to the length of the wire (equivalent to the two pole plates of the capacitor) and the distance between the wires (equivalent to the distance between the two plates of the capacitor). Therefore, it is necessary to reduce the distributed capacitance and increase the passband.

Just reduce the length of the wires or the distance between the really large wires (i.e. don't entangle the wires) and you're good to go.

There are, for example, cable TV in general. When the signal is not good, you will notice that the clarity decreases as the channel increases. The reason is that there is a large loss in the ** channel of the high-channel TV carrier frequency signal.

Therefore, the installation of amplifiers on cable TV is also to try to shorten the input line of the amplifier (generally as close to the front end of the incoming line as possible). When the signal is amplified, it will cause loss even if it is transmitted to the TV through a long wire, but because the signal is relatively strong, there is still a strong high-frequency signal to the output. Therefore, the same amplifier is connected to different positions, and the effect is different.

The transmission speed is related to the dielectric constant of the insulation, the minimum dielectric constant of air is 1, and the signal travels in air at the same speed as the speed of light.

Class 6, at least 1000MB is no problem.

It can be understood that the current limit is so much.

Even if it can be higher than this, the more there is no electrical port network card to cooperate, and no matter how high it is, it is the optical fiber used, such as the 10000MB interface.

The theory is 100ms, but the actual maximum is 10Mbps or 16Mbps, which is the value of the Category 5 line. The transmission speed of the Category 6 line has not been tried.

You're all wrong, it's not just about gigabits, it's about the length of a single packet. The higher the average packet length, the greater the limit rate.

First of all, you need to understand that the "M" of 100M of broadband is not the "M" of the storage unit MB.

M in broadband, routers, network cards, and network cables refers to the abbreviation M. in Mbps for transmission bandwidth

If your broadband is 100M broadband, and the transmission speed cannot reach the bandwidth when using wireless, then either the router does not meet the requirements (the old 54M router), or the wireless module of the wireless device does not meet the requirements (like the wireless module of some mobile phones does not meet the bandwidth requirements). ）

The difference between Category 6 network cable and Category 6 network cable is discussed from the following aspects;

Transmission rate of Category 6 network cable: Category 6 network cable supports 250M bandwidth, and the transmission rate is 1000M

The support bandwidth of the Category 6A network cable is 500M, and the transmission rate is 10G

Category 6 and 4 pairs of unshielded network cables are referred to as Category 6 network cables.

4 pairs of core diameter 24AWG 23AWG single-strand multi-strand high-quality oxygen-free copper are used as the transmission conductor (the copper conductor is insulated with HD-PE material outside), the cross is isolated, and the color of the insulated wire is marked according to the full chromatography. It can support the performance requirements of existing network applications and pass the certification of domestic authoritative certification bodies, and is widely used in indoor horizontal wiring and LAN wiring.

Category 6A (6A) four pairs of unshielded network cables are referred to as Category 6A network cables.

On the basis of the six categories, the parameters of the 6A cable have been greatly improved, and the transmission frequency has also been extended to 500MHz; 4 pairs of 23AWG single-strand multi-strand high-quality oxygen-free copper are used as transmission conductors (the copper conductor is insulated with HDPE material outside), which is widely used in indoor horizontal wiring and LAN wiring.

The six types of network cables are also divided into three types: unshielded network cables, shielded network cables, and dual-screen network cables.

4 pairs of core diameter 24AWG 23AWG single-strand multi-strand high-quality oxygen-free copper are used as the transmission conductor (the copper conductor is insulated with HD-PE material outside), the cross is isolated, and the color of the insulated wire is marked according to the full chromatography.

Category 6 four-pair unshielded twisted pair cables are widely used in indoor horizontal wiring and LAN wiring.

Category 6 four-pair shielded twisted pair is used for integrated wiring with serious electromagnetic interference in the external environment.

Category 6 four-pair double-shielded twisted pair cable is suitable for integrated wiring with serious electromagnetic interference in the external environment.

There are also three classifications of super six types of twisted pair (6A): 6A shielded twisted pair, 6A four-pair double-shielded twisted pair, and 6A four-pair unshielded twisted pair.

Commonalities: cross isolation, transmission frequency also extended to 500MHz; 4 pairs of core diameter 23AWG single-strand multi-strand high-quality oxygen-free copper are used as the transmission conductor (the copper conductor is insulated with PE material).

Differences: Three different types of Super Six are routed in different environments according to their own characteristics. 6A double shielding is a high-efficiency double-shielding structure of integral aluminum foil for pairs and twisted pairs, which is suitable for integrated wiring with serious electromagnetic interference in the external environment.

Commonalities: Category 6 network cables and Category 6 network cables are backward compatible, Category 6 is compatible with Category 6 network cables, and both are compatible with Category 5e network cables.

The main difference between Category 6 and Category 6 is in performance: the parameters of Category 6 unshielded twisted pair cable are greatly improved compared with the previous Category 5 Category 5, and the transmission frequency is also extended to 250MHz or higher. The super six network cables are also called 6A, which can support 10 Gigabit Internet access, and the current maximum can reach 500MHz, which is twice that of the six types of network cables.

Category 6 network cable usually refers to Category 6 unshielded twisted pair cable, and Category 6 network cable is a level of network cable that is one level higher than that of Category 6 cable in terms of performance. Both the Category 6 and the Category 6 cable have added an insulated cross skeleton in the structure, and the four pairs of twisted pair cables are placed in the four grooves of the cross skeleton.

The detailed differences are as follows:

The logo on the wire skin of the Category 6 network cable is cat6, and the logo on the wire skin of the super 6e network cable is that the core of the cat6e network cable is denser, and the conductor is thicker.

The cross skeleton of the Super Six is in the shape of a gear-like wired groove.

In terms of performance, the parameters of the Category 6 unshielded twisted pair are greatly improved compared with the previous Category 5 and Category 5, and the transmission frequency has also been extended to 250MHz or higher. The super six network cables are also called 6A, which can support 10 Gigabit Internet access, and the current maximum can reach 500MHz, which is twice that of the six types of network cables. The purpose of adding a cross skeleton to Category 6 network cables and Category 6A network cables is to solve the common 'crosstalk' problem in Category 6 transmission.

The shape of the gear-shaped wire groove in the Super 6 can effectively change the enhanced signal and prevent the minimization of signal attenuation.

The difference between the sixth-class line and the five-class line, the difference between the super-five and the super-six, which type do you prefer?

The bandwidth of the Category 6 line is 200-250m

The bandwidth of the Category 6A line is 550m

The above is for each pair of lines, so if I want to transmit 1000m in the actual network, I must use super Category 6 cables, because due to the installation and construction, quality, and quality of network cables, it is impossible to reach 1000m at full load. The 1000BASE T standard formulated by the IEEE is to carry out 1G transmission rate on Category 5 lines, because the limit bandwidth of Category 5 is 125M, this standard stipulates that 4 pairs of lines can be used for full-duplex data transmission at the same time, and at the same time a more powerful signal transmission and encoding and decoding scheme is utilized, which can transmit twice as much data as 100BASE-T on the link, namely: 125M2 250Mbps, Then 4 pairs of wires can reach a data transmission rate of 1Gbps, so there is no need for Category 6 or super Category 6 wires, but when wiring, it is strictly in accordance with the 1000Base T standard for wiring.

Class 10m 100m.

Class 100m.

3. Super 5 class 1000m.

Class 10000m.

Calculation formula: RB=rslog2m(b s).

where m is an integer greater than or equal to 2.

The relationship between the message transfer rate and the bit transfer rate is:

rm=ηrb（b/s）

where is the transmission efficiency.

This needs to depend on which category your cable belongs to, which is mainly divided into 4 types of wires, 5 types of wires, super 5 types of wires, and 6 types of wires! The normal maximum transmission rate is 10m 100m for class, 100m for class 3, 1000m for class 5, 1000m for class 5, 10000m for class

A few days ago, the most commonly used is the super 5 line, with a maximum of 1000mbps

1. The total bandwidth, also known as bandwidth, refers to the amount of data that can be transmitted at a fixed time, that is, the ability to transmit data in the transmission pipeline. In digital devices, bandwidth is usually expressed in bps, which is the number of bits that can be transmitted per second. In analog devices, bandwidth is typically delivered in cycles per second, or hertz

hz). Bandwidth is especially important for basic output-to-system (BIOS) devices, such as fast disk drives, which are hindered by low-bandwidth buses.

The amount of data that can be transmitted on the network line per unit time is bps (bit per second) The bandwidth of a computer network refers to the maximum data rate that the network can pass, that is, how many bits per second.

Broadband is generally demarcated by the upper limit of the current dial-up Internet speed of 56kbps.

Access of 56kbps and below is called "narrowband", and access methods above it are classified as "broadband". There is no accepted definition of broadband, from a general point of view, it is the bandwidth that can meet the needs of people's senses to transmit all kinds of ** on the network, so it is also a dynamic and developing concept. At present, broadband for home users means that the transmission rate exceeds 1m, which can meet the needs of a large amount of information transmission such as voice and image.

Including: Fiber, XDSL (ADSL, HDSL), ISDN (not strictly speaking, broadband) Broadband refers to the way to access the Internet. Relative to the ** dialing narrow band said.

Bandwidth refers to the speed of surfing the Internet, how many MbitIt can reach per second. For example, ADSL broadband with one megabyte bandwidth.

Today's broadband is generally 2m, 4m 6m, 8m 10m, 20m, ** commonly used optical fiber and twisted pair, basically nothing to do!

The network cables can support gigabit speeds.

Your so-called speed is limited by the Netcom company, and the maximum speed is so big, in fact, it can't be reached.

If you add a router here, you can share the Internet with multiple machines, but the speed is not so fast, that is, the total speed is only 2M

Optical fiber is an abbreviation for optical fiber, which is a fiber made of glass or plastic that acts as a light conduction tool. The principle of transmission is 'total reflection of light'. Former President of the Chinese University of Hong Kong, Charles Kao and George A

Hockham was the first to propose the idea that optical fiber could be used for communication transmission, for which Charles Kao was awarded the Nobel Prize in Physics in 2009.

The transmission speed of optical brazing is different from that of traditional broadband, and the transmission speed of optical brazing is faster, so the network speed will be much faster.

Category 5 limit 100mbps

The CAT5e network cable is stable at 100Mbps

Category 6 network cable 1Gbps

Category 6 and Category 7 network cables: 10Gbps