ADSL Fault and solution method Daquan

Hardware class

Joint loosening, network cable broken, hub damage, computer system failure-the above fault can be observed by the modem, the hub or computer lights to help locate the suspected equipment to replace the experiment.

Voltage is not normal, the temperature is too high, lightning--voltage instability where the best for the modem with small power UPS (uninterruptible power supply), the modem should be kept dry and ventilated, avoid water, keep clean. Thunderstorm, it is necessary to power the modem and all the connection dial to avoid damage by lightning. Modem damage If the LED is not lit, or only one light, or replace the network cable, network card after the 10BaseT lamp is still not lit the modem has been damaged, please contact the service provider.

Line quality-distance is too long, line quality is poor, wiring is unreasonable, performance is often lost synchronization, synchronization difficulties, or a slow inertia speed.

Workaround: Put the required and connected devices such as telephone extensions, fax, general modem, etc. put to the phone mouth of the distributor, check all the contact is good, the quality of the line should be modified or replaced; If the above work still can not solve the problem please contact the computer room, and coordinate with the computer room adjustment parameters. After consulting the room, you may consider replacing the host phone or trunk line.

Software class

Reboot-Restarting the modem (power supply), computer, or hub is a very effective way to try it out. But often drop the line, restart the modem after return to normal, it may be the use of unreasonable network structure. Single network card proxy server LAN, it is very easy to appear this phenomenon, the solution is to do dual network card agent or with a router, in short, so that the modem can directly connect to the server network card or router port and not directly connected to the hub. Individual network card and modem connected also appear similar phenomenon, please replace the network card.

Troubleshoot the problem

General principles are: Pay attention to indicators and error information, hardware software after the first, the internal external, the first local after the network, first test the host after checking customers, fully check and then declare. Failure to declare a fault should be accurate and concise, should be as far as possible the user encountered problems and the user manual referred to the fault corresponding. When reporting a failure to the engine room, the port number and user name should be reported first according to the user manual. For frequent breakdowns, the user should record and refer to the declaration.

Examples of software failures

If 4 status lights are stable green,

① virtual virtual software dial-up connection software dial-up connections prompt for "Time Out" ... "Check the cable connection between the computer and the ADSL modem." See if the 10BastT lamp in the dial is flashing, if not flashing, indicating that the computer did not pass the data to the modem, may be the computer itself software problems, you can restart the computer, or reload virtual dial-up software.

② virtual virtual software dial-up connection software dial-up Connection when the prompt for "authentication Failed" indicates that the entire line ADSL, but the user account and password does not match, should be filled in again. If you determine the user account and password is correct, you can consult the Business Hall.

③ if the virtual dial-up software dial-up connection is normal, but not on the network. As long as the dial-up connection is normal, generally, ADSL is normal, not on the network is the user's own computer system problems.

Problems

1.ADSL is the simplest method of fault diagnosis?

Answer: According to the ADSL modem panel lights on the display of the initial judgment (Zhanjiang currently has four kinds of ADSL modem for users to choose from, the following is the Nokia Bridge Ethernet interface standard of the modem, and other later introduced), as follows:

"ADSL" lamp: Used to show the synchronization of the modem, often bright green light means that the modem and the local side can be normal synchronization; a red light means no sync; a flashing green light indicates that synchronization is being established; The Shiliang may be affected by an indoor telephone extension.

"LAN (10m-100m)" lamp, used to show the modem and network card or hub connection is normal, if this light is not bright, the modem and the computer is certainly not, when the network cable in the data transmission, this lantern flashing slightly.

The "SYS" lamp, which is related to remote administration, is generally illuminated steady.

"POW" lamp, power display.

2. Will the quality of telephone service be reduced with ADSL internet? In addition, does the call lead to a decrease in internet speed?

Answer: ADSL equipment in the design has taken into account this point, the use of Frequency division multiplexing technology to the phone sound and data flow separation, do not interfere with each other. In the actual circuit test, the installation of ADSL telephone and ordinary telephone voice no difference: While the transmission of data information, lift the phone, hang up the telephone and free call, transmission rate remains unchanged.

3. Why sometimes ADSL access speed is no more than ordinary dial-up modem how much faster?

Solution: The ADSL access speed is slow, as follows: A. If you visit a foreign site, the access will be affected by the export bandwidth and the configuration of the other site; b. Because the ADSL technology to the telephone line quality requirements, and the current use of ADSL is a radsl[-speed adaptive ADSL] , if the telephone line between the telephone building and the user is interfered by external factors in a certain period of time, the RADSL will dynamically adjust the user's access speed according to the quality of the line and the distance of transmission.

4.ADSL sometimes not normal internet, this is what reason?

Answer: ADSL is a twisted-pair transmission technology, twisted pair of two insulated copper wire with a certain regularity of each other entangled together, so that it can effectively resist the external electromagnetic interference. But the market most telephone lines are parallel lines, from the Telephone company junction box to the user phone line is a lot of lines used are parallel, this is very unfavorable to ADSL transmission, too long non twisted-pair transmission will cause connection instability, DSL lights flashing, and so on the Internet. Because ADSL is in the ordinary telephone line of the bottom-frequency voice superimposed high-frequency digital signal, so from the telephone company to the ADSL filter this connection any device will endanger the normal transmission of data, so do not before the filter and telephone, phone anti-theft devices and other equipment.

5.ADSL speed (general user open 512Kb, conditional user can open 2m-8mbit/s rate)

Answer: Question of the rate unit. The so-called 56K modem download Max only 5-6k. The 56K unit is bit and the rate at which the download is displayed is byte. 1byte=8bit. So the download display is 52kB, actually has reached the 416bit, has been quite fast. Due to the server and the client hard disk read and write speed and many other reasons, the local download speed can not play ADSL's maximum capability. We also expect faster servers to appear.

6. Why the ADSL indicators are normal will also be off the net?

Answer: ADSL indicator, the most important light is "ADSL" instructions. When the ADSL line is no problem, the light should be green. But some users in the "ADSL" indicators are normal when the line will also drop, and restart the modem is good. This happens most of the network users who do not do proxy server, do not do arson wall or router, this is why? Because in the ADSL modem has a "10base-t" mouth, this port is connected to the LAN, is actually a hub mouth. Although it is a 10M port, the uplink bandwidth of ADSL is only hundreds of kbit/s. If the user LAN internal is ADSL directly connected to the following client, the network of many ADSL-independent data packets will occupy ADSL uplink channel, ADSL also can not control the local area network broadcast storm, such as over ADSL uplink transmission capacity, packets will be loaded into the ADSL cache, If the data volume continues to increase, the cache overflow, resulting in ADSL "sleep" phenomenon. This only restarts the modem. The solution is that the funds are not very strong users can do a dual network card proxy server (must have dual network card), so you can cut off the modem and the local area network direct communication, to avoid the above problems. It is best to use a firewall or router for the unit user.

7. Why sometimes virtual dialing fails?

Answer: ADSL virtual dial-up software is used with the following error messages:

A. The Dial window displays "Begin negotiation" and then waits, and finally pops up the menu "Time Out" directly. This situation indicates that the network is out of communication. The reason is: ADSL on the 10BaseT port on the network cable is not connected well; ADSL network does not pass, you can restart the ADSL and try again.

B. The dial-up window displays "Begin negtiation", then "authenticating", and finally "Authentication Failed". This situation indicates that your account number or password is incorrect.

C. The dial-up window displays "Begin negotiation", then "authenticating", then "receiving network Parameter" and the Last pop-up menu "Time Out." This situation indicates that the Dial-up IP address is already full, please redial later.