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Wednesday, July 28, 2021

Abnormal network connection

Abnormal network connection


I'm a home network ~ the home network has been broken intermittently ~ either crazy disconnection ~ or download without resources ~ the specific symptom now is ~ the network is unstable ~ the download speed and the delay of playing games are normal ~ but sometimes I can't open the website ~ I'll start again later


 let me answer and share the report


3 answers # topic # Tokyo Olympic Games, can Japan surpass China in the number of gold medals?


Anonymous user


Recommended on November 25, 2017


This phenomenon is caused by three reasons: first, the responsibility of the operator (transmission and switching network failure): the operator must ensure that the user's signal quality (bandwidth, bit error rate, signal-to-noise ratio, transmission rate, signal level, input-output impedance, signal stability and input-output impedance stability) meet the national standards); Specific telephone: Telecom 10000 Netcom 10060 Tietong 10050 II: website problems: 1: website server is unstable; 2: The software of the website is unstable; 3: The quality level of website operation and maintenance is low; Failure to eliminate faults in time; For example, it's good to go to other websites, but a website is particularly poor. This is the problem of the website itself, which has nothing to do with operators and users. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ III: the user (responsibility) the following factors will lead to your current status. If the above operators have no problems, then it is your user's own problems; If you don't have the following problems, you can call the operator directly and ask the operator to give you the operator's own relevant matters. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 1: power supply 1.1 check whether the power supply is stable with a multimeter? 1.2 is the AC voltage fluctuation within the allowable range? Does it exceed 5% of the rated voltage? 1. Is the ripple coefficient (checked with millivoltmeter) qualified after 3A / D power conversion? 1.4 is the temperature rise of the power supply abnormal? 1.5 whether the voltage stabilizing characteristics meet the technical indicators? 1.6 under 1.5 rated load, whether the voltage stabilizing characteristics and ripple coefficient meet the technical indicators? 1.7 when replacing a large fan, does your power capacity meet the requirements? 1.8 the power supply of general auxiliary equipment (router, network switch, cat, etc.) is rectifier power supply, without voltage stabilizing function, with large ripple coefficient (possibly caused by dry filter capacitor) and poor load capacity; If the equipment cannot work due to heating, special attention shall be paid to the monitoring during operation. 1.9 due to over-voltage (like feeding a child, more can support death), low voltage (like feeding a child, less will lead to malnutrition), excessive voltage fluctuation (like feeding a child, hunger and fullness are not quantitative), over-current and heating, the over-temperature protection action will cut off fault and exit the equipment from operation (i.e. slow, delay Repeated startup, delay, dropping, interruption, disconnection, automatic shutdown, crash, etc; 1.10 whether the overcurrent protection and overheating protection of the power supply act correctly? Is the action sensitive? Whether it refuses to operate or misoperates? ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 2: check the network cable and crystal head (R45): 2.1 whether the crystal head and seat are inserted properly (loose)? 2.2 is the contact good? What is the contact resistance? 2.3 is there ash accumulation? Is it oxidized? 2.4 whether the mechanical locking of crystal head and seat has been locked? 2.5 is the locking firm? 2.6 is the network cable and crystal head tightly pressed and in good contact? 2.7 the insulation resistance between network lines (using 100V megger) shall be greater than 20 megohm. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 3: lightning protection and grounding: grounding is mainly to ensure the safety of personnel and equipment! Lightning will burn the network card; In serious cases, it can cause fire and casualties! Multi point grounding, repeated grounding and nearby grounding are the principles; Grounding is divided into protective grounding, shielding grounding, working grounding, etc; Static electricity is the culprit of the crash blue screen! I use a noise meter to test that the noise voltage when it is not grounded is more than 6000 times greater than the signal. If you are not grounded, can your equipment work with such high noise? Grounding is the most basic requirement for it, especially for analog equipment and digital circuits. Interference from all aspects can be reduced or eliminated through grounding. External interference and line coupling between local and local wiring can be reduced and eliminated. Do a good job in equipment grounding shielding. Many interference comes from poor shielding and poor grounding, Many people only work on software. Many interferences are caused by poor grounding or no grounding. This kind of fault is very easy to occur and easy to be ignored by many people. Many equipment damage is directly related to grounding. No grounding or poor grounding will lead to inter symbol interference, bit error, delay, packet loss, interruption, disconnection (disconnection, interruption), crash, card Automatic shutdown, repeated startup, repeated startup, frequent restart (or repeated connection), etc. The grounding must have more than two grounding electrodes, with a minimum interval of more than 10m between each grounding electrode. The grounding wire from the grounding electrode to the machine room shall not have any joint. It shall be introduced into the bus bar of the machine room with soft copper wire with a section of no less than 25mm2 (no joint is allowed in the middle). The grounding wire shall be symmetrically connected with Faraday network to facilitate diversion and dispersion, The connection point with the bus bar shall be coated with silver powder conductive paste. The cross section of the grounding wire from each equipment to the bus bar (independent) shall not be less than 4m2. The grounding resistance of the bus bar to each grounding electrode shall be less than 5 ohms (the smaller the better). At least use the grounding instrument (the grounding instrument above grade 2.5 and within the inspection qualification period) to check more than twice a year. It is forbidden to check the grounding electrode in thunderstorm weather. It is strictly prohibited to use the n-zero line of water pipe and power line as grounding; That is, an independent grounding device. The wires of each equipment are independently connected to the busbar of the machine room. It is strictly prohibited to connect the busbar after series connection. I can say subjectively: whether you are an individual user or a collective user of a large computer room, you are not grounded at all (or the grounding is unqualified). ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 4: Bandwidth: the bandwidth from the operator to the user is very important. Without sufficient bandwidth, sufficient data traffic cannot be guaranteed; It is impossible for computers to surf the Internet smoothly; The bandwidth mentioned above refers to the bandwidth of the whole process. As on the expressway, there is such a wide bandwidth that there can be no fluctuation in the whole process; A little fluctuation in the whole process will affect the network speed; The user has the right to ask the operator (test with frequency sweeper) to provide guarantee; 5: Signal to noise ratio: (the ratio of signal to noise can be understood as the purity of the signal) when it is small, the useful signal is covered up by the noisy stray signal (especially the inter symbol interference between symbols), so that the receiving path cannot correctly extract the useful signal from the noisy signal, and the judgment circuit cannot correctly judge the symbols, resulting in bit error Serious bit error is packet loss. Serious packet loss is the cause of delay. Serious delay is line drop (slow, delay, repeated start, line drop, delay, line drop, interrupt, line break, automatic shutdown, crash, etc.). Use a noise meter or level meter to measure whether the noise level is within the allowable range, Or use an oscilloscope to observe whether there is stray signal? Is there inter symbol interference between symbols? Take measures to eliminate it. The signal to clutter ratio should also be greater than 60dB. Test (observe) with frequency sweeper and oscilloscope. This indicator is to ensure that the road is flat and barrier free. There is such a wide road, but also the whole process is barrier free. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 6: matching: matching includes level skin matching and impedance matching (tested with level meter and signal generator). 6.1 level matching: the received signal cannot be too low. When it is too low, it cannot reach the threshold level range required by the receiving path, and the equipment cannot work normally; If the level is too high, the front circuit of the receiving circuit will be saturated or burned out. If the receiving level fluctuates near the receiving threshold, the computer will restart frequently; Therefore, the reception level adjustment is very important. During operation, the level meter or oscilloscope shall be often used to monitor and adjust the receiving level at the connection within the appropriate amplitude range. Monitor the adjustment with a level meter according to the instructions. 6.2: impedance matching: the connection point must match the impedance relatively. The mismatch of input and output impedance will lead to reflection attenuation, and the signal can not work normally no matter how strong it is. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 7: optimize the network structure. When people turn on the computer to surf the Internet, they will produce garbage. Just like eating, not cleaning the table, not brushing the tableware and not cleaning the stove, they will produce computer garbage, and the computer will gradually show faults such as slow, card, delay, repeated startup and disconnection; Therefore, I recommend using some gadgets: such as super rabbit, optimization master, Lu master or 360; Form a good habit of cleaning up garbage before going offline. 7.1: timely remove the garbage fragments and ie cache generated from the Internet: as long as you use the computer, garbage will be generated. If you don't clean it in time, it will accumulate more and more. If you don't clean it for a long time, the running space of Disk C will be smaller and disorderly, and finally slow down gradually until it crashes; Therefore, regularly sorting and running C disk can maintain the running speed of the computer.


7.2: synchronize ADSL equipment first: power off the equipment and restart it. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 8: software setting and configuration 8.1: common software download software should be downloaded from large official websites as far as possible. Do not install 3, informal software, P2P (resource occupying) software and uncommon software. Turn off all unnecessary network connections and startup items, such as Xunlei, BT, donkey, etc; Do not put the non running software in the running C disk; Update patches in real time. Game software should be downloaded from regular large websites. Pay attention to whether the software is stable. Immature and unstable software will lead to slow, card, crash and other faults, especially some popular game software. Some netizens have a strong response to this. Such software should be paid special attention to or deleted immediately; When downloading software, you should pay attention to the safety of rogue software inserted into the critical computer and clear it at any time. Many acceleration software are mostly with viruses or advertising plug-ins, which occupy your disk resources. After some game software starts, the game will be directly dropped by T, and there will be infinite disconnection, restart and other faults after coming up. Protocol: the protocol in the network should also match it. If it does not match, it will also cause some equipment failures. Software conflict will also cause problems such as delay, card, slow, crash, drop line, interrupt and so on. 8.2 anti virus software and firewall: at least one valid genuine anti-virus software and often upgrade the virus library: if the firewall is set properly (not too much, too high or too low), some web pages will not open; Viruses can make computers slow down, crash, drop lines, get stuck, restart repeatedly and fail to switch on and off. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 9: temperature, humidity and temperature rise with the extension of startup time, the temperature of the main equipment and its auxiliary equipment (cat, router, network switch, etc.) will gradually rise. If it cannot be distributed quickly, it will be delayed - slow - dropped - crash. 9.1 humidity: in rainy season or rainy days and high humidity areas, the insulation between lines and devices decreases and the signal level decreases, resulting in computer inter symbol interference, bit error, delay, packet loss, interruption, line drop (short line or interruption), crash, automatic shutdown, repeated startup (repeated connection), or unstable operation. Humidity accelerates oxidation, resulting in transmission interruption.


9.2: temperature (at present, the country is in the high temperature season, and the faults caused by temperature will accumulate and increase, which may last for several months): from the start-up, the temperature is gradually increasing, and when the temperature rises to a certain value, it will stabilize at this value, and the difference between this value and the ambient temperature should not be greater than 25 degrees; As the computer is a semiconductor device, the actual temperature of the device shall not be higher than 85 degrees; When the chip temperature is close to 80 ℃, measures shall be taken to reduce the working environment temperature of cats, routers, network switches and computer equipment. If beyond this range, the computer will produce inter symbol interference, bit error, delay, packet loss, interruption, disconnection (disconnection or interruption), crash, automatic shutdown, repeated startup (frequent connection), etc. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 9.3: the temperature rise (the difference between the actual temperature of the equipment and the ambient temperature is called temperature rise) is less than 25 ℃. The temperature has a great impact on the normal operation of the equipment, especially when the isothermal rise of network switch, router, computer motherboard chip and network card is large, the equipment will not be able to operate; In particular, portable (also known as notebook) computers are difficult to dissipate heat due to giving priority to volume in design. They are most prone to inter symbol interference, bit error, delay, packet loss, interruption, drop line (short line or interruption), crash, automatic shutdown, repeated startup (repeated connection) and other phenomena caused by temperature rise. The measures are as follows: A: place the equipment (refer to Hubble, cat, router or network switch, computer, etc.) in a safe place for people, first disconnect the power supply, then open the box cover of the equipment, and use air convection to strengthen contact with air for natural heat dissipation;


b: Add micro fans to the equipment to increase air convection and conduct forced heat dissipation;


c: If you are in it, I suggest you: after disconnecting the power supply, add heat sinks to the heating parts of the equipment.


d: After the power supply of the equipment is disconnected, drill a lot of holes on the equipment with a 3mm drill bit to strengthen the flow of air and improve the heat dissipation conditions; e: As for the ventilated and dry place of the equipment, it is best to make an insulated heat dissipation support (which is also used for notebooks on the market) to support the equipment for natural heat dissipation; f: After the computer has been used for a long time, when the silica gel between the CPU and the heat sink is dry, the CPU will seriously heat up, resulting in packet loss, delay, slow, repeated startup, drop, interrupt, disconnection, automatic shutdown, crash and other phenomena. Re coat the silica gel to restore normal use.


g: Timely remove the garbage fragments and ie cache generated from the Internet: as long as you use the computer, garbage will be generated. If you don't clean it in time, it will accumulate more and more. If you don't clean it for a long time, the running space of Disk C will be smaller and disorderly, and finally slow down gradually until it crashes; Therefore, regularly sorting and running C disk can maintain the running speed of the computer.


h: Synchronize the ADSL device first: power off the device and restart it. Users who often surf the Internet for up to half a year should open the shell of the equipment after power failure (by the way, check whether the internal connection of the equipment is good, whether the memory module is loose, and whether the contact between the memory module and the card slot is good? Are the plug-ins loose? Is it tight? Whether the two connection points are firm and in good contact), clean the dust in the equipment. 10: Wiring: the wiring process is based on the principle of minimum interference; It is required that the wiring should be neat and beautiful, the strong and weak signals should be separated, and the high and low frequency signals should be separated. Unreasonable wiring will produce interference caused by coupling and crosstalk between lines. The lines should not be intertwined. It is best to use shielded (reliable shielding layer and grounding) lines. These parasitic interference will reduce the signal-to-noise ratio of the computer and fail to identify useful signals, resulting in inter symbol interference, bit error Delay, packet loss, interruption, dropping (short line or interruption), crash, automatic shutdown, repeated startup (repeated connection), etc. ★ copyright statement: this answer is harmonious and original, and no one can steal it! ★ 11: if the battery capacity of the motherboard is not enough, the battery will not work. 12: ADSL users: multiplex computer signals together with telephone lines, and pay attention to the impact on the computer under the three states of pick-up, hang-up and ringing

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