Ask about the resistance and signal strength of the network cable

It is not recommended that the non-standard four-core network cable long-distance transmission is unstable, if you merge the line, it will only aggravate the crosstalk between the data lines, affecting the network quality, the network signal is different from the current signal, not that the thicker the wire diameter, the better the signal, the network signal pays attention to the signal anti-interference and the internal resistance of the material used in the transmission line, generally speaking, the smaller the internal resistance of a single material, the more stable the transmitted signal, the most ideal is the optical fiber, in addition to the two-end equipment, the transmission line itself can be said to be immune to interference, Unless you put a different light source in the same optical fiber, the current network cable material has iron wire, aluminum wire, copper wire, and copper wire is divided into purity, well, this is my personal knowledge level understanding, I hope it will help you.

The terminal connection required in the Fast Ethernet cabling is not more than 100 meters, which is not for line attenuation and crosstalk, but is related to the Fast Ethernet working mode.

Fast Ethernet works on the carrier listening collision detection mode, using the datagram retransmission mechanism, a node that accesses the network needs to listen to whether the line is idle before sending data, and if it is idle, it will be sent, but the line idle state will be detected by multiple NICs at the same time, so line collisions are inevitable, when the NIC finds a line conflict when sending data, it will terminate the transmission, and delay a specified period and then retry until the data is sent. When the node sends data, it will split the data into small data slices, and the shards are transmitted, and after each piece is sent, it needs to wait for the confirmation of the peer, and after receiving the confirmation from the peer within the specified time, it will continue to send the next piece of data, and if the confirmation is not received, it is considered that the data slice is lost and needs to be retransmitted, and if the multiple retransmissions are not confirmed, it is considered that the network has a fatal error and interrupts the data transmission.

You can think of this process as if you send 100 pages of materials to someone far away, only one page at a time, and wait for the remote confirmation message each time before continuing to send the next page, of course, you can't wait for the other party's confirmation indefinitely, if the mail takes 1 day each way, then you may assume that you can't receive the confirmation within 3 days and resend the previous page, if you don't receive the confirmation message twice, then you think that there was a serious error in the mailing process, and you will terminate the mailing.

The problem is that although the propagation speed of the electrical signal is close to the speed of light, it still takes time to propagate, and with the extension of the line, the period of the remote feedback signal will continue to increase, and when the line is long to a certain extent, even the normal confirmation feedback cannot reach the other end within the period specified in the protocol, causing the data piece to be repeatedly retransmitted until the retransmission counter reaches the upper limit and stops transmitting. Generally, the speed of electrical signal transmission in copper medium is calculated at 80% of the speed of light in air, and the transmission speed of copper medium electrical signal will be faster. The 100-meter length specification is to ensure that the copper medium that meets the specified process can safely work on the fast Ethernet working mechanism, otherwise the length of the network cable can be extended indefinitely by adding an amplifier.

Most of the time you can extend the network cable by a few meters without noticeable problems.

There is a signal for 50 meters of the network cable, and the network can be used normally.

Theoretically, the maximum length of a network cable cannot exceed 100 meters. If the network cable has strong performance, tensile resistance and shielding interference, the longest length can reach about 120, and it is not recommended to be longer.

The reason why the network cable can't be too long:

The only languages that the computer can recognize are 0 and 1, and the signals that the network has to transmit are 0 and 1. These signals become current when they pass through the network cable, and the current intensity of the network cable is between -15V and +15V, and there is resistance when the current is transmitted through the network cable. Therefore, according to the principle of high-voltage transmission, the longer the line, the greater the voltage level must be used to transmit electricity.

If the network cable is too long, but the voltage is so low, the signal will be weakened until it is lost. Therefore, the network cable should not be too long.

I can tell you very responsibly. There must be a signal. Theoretically, it's weakened. But I can't feel it. The network cable of our unit is about 100 meters. I didn't feel like it was going to be slow. The maximum network cable is theoretically 128 meters!

Theoretically, the connection of Ethernet can reach 100 meters, but in fact, it is related to the quality of the network cable and the performance of the network card, but the 50 meters of *** should be fine, and it is difficult to say if the quality is poor.

This is a combination of fiber plus twisted pair. The signal is fine. You can use it with confidence.

No, the losses are negligible!

No, as long as there is a signal, the strength does not matter whether the network cable is good or bad or the network speed, unless the network is disconnected.

It is not related, it is related to the distance between routes, and it is related to the quality of routes and wireless.

Yes, but mainly the distance of the device.

Analog signal transmission is used from the operator's equipment room to your modem device, and its signal attenuation is relatively small. But the line from your modem to your computer is better not to exceed 50 meters, as the network cable will seriously affect the quality of the Internet.

If the IP address of the route is less than or equal to 1 millisecond, the network cable signal is relatively strong, and if it is greater than or equal to 1, the data may be packet-lost.

This is mainly related to the network conditions and server congestion when you test, and the network speed is sometimes really inaccurate, so don't worry about it.

1.After plugging it into the computer, the socket will glow, indicating that the network cable has been connected.

2.You can look at the lower right corner of the computer desktop, if the local connection is OK, it means that the network cable has been connected.

As long as one of the above situations occurs, it is said that the network cable connection is successful. If neither appears, the network cable connection has failed.

As for the signal strength, because the network signal is a digital model, generally speaking, it doesn't matter if the signal is weak, it will not affect the network speed.

Connect to a computer or router and test the internet speed.

How to set the router wifi wireless signal is unstable

Wireless channel selection settings

Choice of wireless modeSwitch for 5G mode

The signal is not good, and it has nothing to do with the power failure and unplugging the network cable, it mainly depends on the performance of the router.

It should be caused by mutual interference with the same signal channel in the vicinity.

First of all, you directly use the network cable to connect to the computer, the speed is not fast, if the speed of the direct network cable is like this, it is simply a problem of external network cable bandwidth. The wireless connection signal display is very good, but it means that the connection between the computer and the wireless router is usual, and it does not mean that the bandwidth you can access externally is very high, and the wireless router connection bandwidth is high, and the external bandwidth is low.

If you directly connect the computer with a network cable, the network speed is very fast, then see if it is a problem with the setting of the wireless route, such as setting the user's bandwidth limit, if you check the wireless route and there is no problem with the setting, it is a problem with the wireless route, and you can only replace one to try.

The signal strength and the transmission rate of the wireless router do not indicate your Internet speed, and the ultimate restriction on the Internet speed is the access bandwidth at your home.

The signal strength and the transmission rate of the wireless router do not indicate your Internet speed, and the ultimate restriction on the Internet speed is the access bandwidth at your home.

It should be that the interface was not connected well when installing broadband, so please ask Telecom to do ......Or maybe the computer is aging ......

Does the computer startup software occupy the network? For example, the software for watching TV, if there is no above situation, it is recommended to install a system.