What if there is no broadband signal?

If ADSL or optical fiber transmission is used, and Category 5 cables or Hubble, network switches, routers, etc. are used. Internet access may encounter slow computer access (stuck, unable to access the Internet, poor signal, instability, packet loss, high error rate, unable to access the Internet, disconnection, crash, and unreasonable interruption. . . ) and so on, everyone has a headache; The computer system is stable and has a good user working environment interface, so users must do the following, otherwise, it will affect your use:

1: Environmental conditions:

A: stable power supply voltage (add auxiliary UPS power supply when necessary) and effective and safe power supply line section; And comply with the relevant insulation regulations for safe use of electricity; Most of them are low voltage caused by small user line diameter. After the transformation of the two national networks (urban network and rural network), through the monitoring of users (including remote mountainous areas), the qualified rate of user voltage is 99.98%, and the incoming user voltage meets the legal value of national standard.

B: The drying and ventilation temperature is suitable (add a fan or air conditioning system if necessary).

C: It is better to paint the walls and roofs with smaller dust particles.

D: Appropriate signal-to-noise ratio of transmission line: (ADSL) The noise level of subscriber line should be as low as possible to avoid interference and clutter, so that the equipment can work reliably at a small level.

E: Network card problem: Choose a better quality network card.

F: System software configuration: users don't need to set an IP address, and the system will automatically assign it. If DNS is set, it must be set correctly. The operating system is WIN98 or ME. In the DOS window, type WINIPCFG to get the DNS domain, or IPCONFIG for WINXP system.

G: TCP/IP protocol: If users find abnormal browsing, they can try to delete the TCP/IP protocol and add it again.

2. Good grounding system: many computer rooms and equipment are not qualified for grounding: not many are qualified. Everyone knows that grounding gas is very important, and no one does it, let alone individuals. According to the requirements of the specification (Code for Construction and Acceptance of Grounding Devices in Electrical Equipment Installation Project GB50 169-92), there must be more than two "independent" grounding electrodes (grounding cannot be shared), and the lead section from the grounding electrodes to the work site should be multi-strand copper wires with a cross section of not less than 16 mm2, and no joints are allowed in the middle. The grounding wires entering the computer room should be "independent" respectively. The fixing screws of the access point should be plated with silver conductive paste and reliably fixed (there should be more than four independent grounding electrodes in the large computer room, and welding technology must be adopted between the bronze grounding plates to reduce the contact resistance. The computer room adopts Faraday grounding cage, and the hole of cage is not more than 1 m2 for shunting, voltage equalization and shunting). At least once a year before the thunderstorm, the grounding device shall be inspected and tested comprehensively, and the grounding resistance of each "independent" grounding electrode shall not be greater than 5 ohms. The shielding layer of the subscriber line and its subscriber line number line (telephone line or network line) should be grounded immediately when entering the home, so as to reduce the interference to the lowest range, achieve multi-point grounding, and not share with other grounding electrodes, requiring "independent" grounding electrodes; Tap water pipes and (N-line) ground wires of electric power shall not be used as grounding electrodes, and the grounding shall not be wound and fixed firmly with screws. During lightning: disconnect (network cable, telephone line, cut off power supply, etc. ) all contact with the outside world, to avoid equipment and personal accidents and fire accidents.

3. The system is clean and tidy: people wear clothes not because of the grade of clothes, but because they are clean and tidy; Therefore:

Answer: Run the software legally and upgrade the security patch in time; Delete unused files (improve the running speed of the system), clean up the garbage generated by surfing the internet in time, sort out the debris regularly and optimize the system structure;

B: legal and effective anti-virus software, and often automatically upgrade the virus database; Firewall, * * * Internet access software, network acceleration software and other settings are reasonable, and improper settings will also affect users' use.

C: Do not put files such as non-running software into the running disk (reduce the occupation of the C disk and improve the running speed of the running disk); If you find that some software is disconnected when you open it, you should immediately close the software and uninstall it.

D: At ordinary times, strengthen the monitoring and operation maintenance of computers (including auxiliary equipment), pay attention to the instructions of running lights and their alarm signals, avoid expanding accidents, nip problems in the bud, and ensure that the equipment is clean, well ventilated, reliable in connection, moderate in temperature and humidity, good in insulation and neat and beautiful in wiring.

4. Good connection: Check that the main machine must be in good contact with various auxiliary equipment (keyboard, mouse, speaker, R45 connector of network cable (Category 5 cable), power cord, etc.). ), and check whether the connector of household line and telephone line plug is reliable, so as to reduce the fault of machine line; Wiring: balanced vertical, clear and tidy (avoid winding).

5. Ventilation and heat dissipation: users who use "Cat" ADSL, routers, Hubble, network switches, etc. Especially in summer, the ambient temperature is higher, the temperature of cats is also higher, and the heating elements in cats are hotter; So I suggest you:

Answer: put the cat in a ventilated and dry place to dissipate heat naturally;

B: Take the cat to a safe place where people can't reach it, open the cat's box cover, and use the convection of air to strengthen the heat dissipation on the contact surface with the air;

C: forced heat dissipation: add a micro fan to the cat to increase air convection and carry out forced heat dissipation;

D: If you are inside, I suggest that you add a radiator to the cat's heating part after disconnecting the power supply.

E: After the cat is disconnected from the power supply, drill a lot of holes up and down the cat with a 3 mm drill bit to strengthen air circulation and improve heat dissipation conditions;

F: After the power is cut off, open your cat's shell to see if there is any dust. Dust accumulation will affect heat dissipation and remove dust accumulation.

G: synchronize ADSL cat first: turn off the cat's power and restart it.

Cat ADSL modem should be placed in a place with small interference sources to avoid abnormal operation caused by interference.

6. Receiving level under harsh conditions (the wireless network card is the receiving field strength and the optical transceiver is the optical receiving level): signal attenuation is affected by weather, temperature, humidity, distance and changeable interference in transmission, especially the changeable interference in transmission is very complicated and unstable; Therefore, an appropriate reception level is very important. When the line is seriously disturbed and the signal-to-noise ratio is poor, the operator should also ensure that the bit error rate (local area network can reach11000000000-1100000000) received by the computer is not greater than 65438+. If the reception level is too high, the bit error rate will also increase); Instead of what some users often say, just how much bandwidth m is needed; This index should be tested in both directions, and this project should be tested in both directions between the computer room and the users, and it must be qualified to ensure your good operating environment. Users have the right to ask operators to test whether these two indicators are qualified with "error meter" and "level meter" at your client. On the premise of ensuring the bit error rate, the upper and lower limits of the receiving level should be higher than half of the middle value and the upper limit level (for example, the lower limit receiving level is 0dB, the upper limit receiving comment is 100 dB, the actual receiving level should be set to not less than 75 dB, and the attenuation of the amplifier and the receiving branch in all directions. If the indicators in these two directions are adjusted up to standard, the equipment settings are correct and the links are good and correct, then there is absolutely no problem with the uplink and downlink circuits of your computer.

7. Isolation between computer and telephone (ADSL users):

7- 1: The computer is disconnected when ringing: the isolation of the ringing signal by the computer (which should be greater than 60 dB) is not enough, which belongs to the problem of computer (strong electricity intrusion);

7-2: Pick up the telephone and disconnect the computer: it is the telephone voice loop that absorbs the computer signal (shunt attenuation is not greater than 1 dB), which leads to the disconnection of the computer, which belongs to the telephone problem;

7-3: Computer hangs up and disconnects (waiting): It is the absorption of computer signals by telephone ringing loop (shunt attenuation is not greater than 1 dB), which belongs to telephone problems.

8. Influence of humidity: In rainy season or rainy day and its high humidity area, due to large conductance, enhanced inter-line conductivity, increased signal leakage, increased signal attenuation, decreased line insulation and increased line grounding probability, the user signal level of ADSL will drop, resulting in dropped line or unstable operation. Humidity will also accelerate the oxidation of the contact surface, and repeated oxidation will increase the contact resistance, leading to transmission interruption.

9. Reminder: In theory, it is very slim to improve your internet speed with software. Don't believe that simple methods can improve the network speed. The software is relatively slim, which improves the network speed and accelerates the software. In fact, you can't feel it. Generally, it is a tool for adding advertisements. By taking other measures, you can only remove some garbage and debris from your computer on your terminal and optimize your equipment, thus improving the processing speed of your terminal little by little; Just like the low tap water pressure in your home, increasing the diameter of your water pipe can't solve the problem of low tap water pressure; Similarly, you can never improve the internet speed! Isn't this a lie? Nonsense, whimsical; It is difficult for us to observe that software that increases the network speed can increase the network speed. On the contrary, this software is just a tool to add advertisements to your system.

Thank you for taking my answer!

Thank you: friends!