The modem indicator light of ADSL is the most important basis for judging the fault.
First of all, you should be familiar with the precautions of using Modem:
ADSL modems usually use external power supply with plastic shell structure. There are three points to note when using:
One: ADSL modem needs to be placed in a ventilated and heat-dissipating place. The plastic shell structure of Modem is not conducive to heat dissipation. Therefore, in order to ensure the long-term stable operation of ADSL modem, it should be placed in a ventilated place. There should be no covering on the modem and the vertical modem should not be placed horizontally.
Two: ADSL modem is a kind of high-speed data communication equipment, which is easily interfered by external electromagnetic waves, leading to internet failure and so on. Therefore, it is necessary to avoid putting it together with CRT monitors, televisions and mobile phones, avoiding being close to the power strip and away from high-power electrical equipment such as refrigerators and air conditioners.
Third, external power supply is prone to loose and poor connection, and instantaneous power failure will also lead to ADSL modem resynchronization. Therefore, avoid plugging the ADSL modem power supply into the inferior socket, and put the socket in an easy-to-touch place.
1. Tianya series: HASB- 100A vertical, dark blue, 7 indicator lights (the style is older, but Tianya series has the best quality).
Power supply: the modem is turned on (always on) and the modem is not turned on (dark).
Link: Synchronize (always on) Try to synchronize (blink periodically) missed phone lines (dark).
Ready: The modem crashes (always on) and enters the working state (flashing periodically) but does not work (dark).
TX: Telephone interface has data transmission (irregular flashing), and telephone interface has no data transmission (dark).
Rx: Telephone interface has data reception (irregular flashing), and telephone interface has no data reception (dark).
LAN Link/Act: Connect the computer (always on), send and receive data (flashing irregularly), and disconnect the network cable (dark).
LAN 100M: network port rate 100M (always on), network port rate 10M (dark).
**IP and username password: IP:10.0.0.2; User name: admin；; Password: conexant /epicrouter
HASB- 100 horizontal, white, 4 indicator lights (quality … really bad … but it's still a modem, just make do)
PWR: The modem is powered on (always powered on) and the modem is not powered on (dark).
Link /RXD: Synchronize (always on) Try to synchronize (blink periodically) The network port has data reception (blink irregularly).
Ready: The modem crashes (always on) and enters the working state (flashing periodically) but does not work (dark).
Local area network: connected to the computer (always on) with data transmission and reception (irregular flashing) but no network cable (dark color).
**IP and username password: IP:10.0.0.2; User name: admin；; Password: conexant /epicrouter
HASB- 100 level, blue-gray, 5 indicator lights (a little better than the above)
PWR: The modem is powered on (always powered on) and the modem is not powered on (dark).
LAN: Connected to the computer (always on) but not connected to the network cable (dark color).
Data: There is a virus (always on), the network port has a data transceiver (flashing irregularly), and the network port has no data transceiver (dark).
Link: ADSL synchronization (normally open). ADSL tries to synchronize (flashes periodically). Missed telephone line (dark).
Ready: The modem crashes (always on) and enters the working state (flashing periodically) but does not work (dark).
**IP and username password: IP:10.0.0.2; User name: admin password: conexant /epicrouter
HASB- 100 horizontal, black, four red indicator lights, wavy (like a flower, it's really you … just support national construction and national industry)
Data: There is a virus (always on), the network port has a data transceiver (flashing irregularly), and the network port has no data transceiver (dark).
PWR: The modem is powered on (always powered on) and the modem is not powered on (dark).
Link: Synchronize (always on) Try to synchronize (blink periodically) missed phone lines (dark).
LAN: Connected to the computer (always on) but not connected to the network cable (dark color).
**IP and username password: IP:192.168.1.1; User name: root password: root
2. Alcatel series
Plus5 1 1 is horizontal, black, with three indicator lights in the middle of the modem (also the best old model provided by Chengdu Telecom).
@: ADSL synchronization (always on). ADSL tries to synchronize (flashes periodically). Missed telephone line (dark).
: Modem is on (always on) Modem is not on (dark).
: Connected to the computer (always on) but not connected to the network cable (black)
**IP and username password: IP:10.0.0.138; User name: none; Password: None
Plus5 1 1e is horizontal, black, with three indicator lights on the side of the modem (also a good modem with strong stability).
DSL:ADSL is synchronous (always on). ADSL tries to synchronize (flashes periodically). Missed telephone line (dark).
PWR: The modem is powered on (always powered on) and the modem is not powered on (dark).
LAN: Connected to the computer (always on) but not connected to the network cable (dark color).
**IP and username password: IP:10.0.0.138; User name: none; Password: None
3.D-LINK series
D-Link300/500 is horizontal, silver-gray, with 4 indicator lights (rare, but of good quality, it is said that it was previously provided for business users in the city center).
Power supply: the modem is turned on (always on) and the modem is not turned on (dark).
Status: Enter the working state (normally on) and the non-working state (dark).
ADSL link/act: ADSL is connected (always on). ADSL is trying to connect (flashing periodically). The telephone interface has data transmission and reception (irregular flashing). Missed telephone line (dark).
Ethernet Link/Act: Connect the computer (always on), send and receive data (flashing irregularly), and not connect the network cable (dark).
** IP and username password: IP:192.168.1192.168.0.1; User name: admin password: administrator/password
4.UT starcom series
UT-300R is horizontal, black, with four indicator lights (a modem … made by a professional PHS manufacturer … really not so good).
Power supply: the modem is turned on (always on) and the modem is not turned on (dark).
Link: Synchronize (always on) ADSL tries to synchronize (flashes periodically) missed telephone lines (dark).
PC: Connected to the computer (always on), but not connected to the network cable (dark color)
Data: There is virus or crash (always on). ADSL has data sending and receiving (irregular flashing). ADSL has no data transmission and reception (dark).
**IP and username password: IP:192.168.1.1; User name: admin password: utstar
5. Huawei series
MT-800 can be used standing/lying, with a white shell and a green background, and five indicator lights (made in China, with good heat dissipation, others have no advantages).
Power supply: the modem is turned on (always on) and the modem is not turned on (dark).
ADSL Link: Synchronous (always online) link is activated (flashing quickly) and missed telephone line (dark).
ADSL Act: the telephone interface has a data transceiver (irregular flashing), and the telephone interface has no data transceiver (dark).
LAN link: connected to the computer * (always on), but not connected to the network cable (dark color).
LAN Act: the network port has a data transceiver (irregular flashing), and the network port has no data transceiver (dark).
**IP and username password: IP:192.168.1.1; User name: admin password: admin
* Note: Green: the transmission rate is10 Mbps; Orange: the transmission rate is 100Mbps.
6. Because many of them are brought from other places (such as Putian series of Chongqing Telecom), I don't have detailed information at hand, so I won't list them here. Anyway, the most basic modem is three lights: power supply (PWR) and telephone line (LINK). Synchronization) and network lines (LAN. Lan). The basic judgment is based on these three indicators.
After understanding our equipment, we should learn simple troubleshooting methods. Common network faults and solutions are as follows:
A. Unable to access the Internet ("Error 678" or "E0040" is prompted when dialing)
1. First, look at the status of the modem power light: it is not on. Would you please turn on the power first? Or change the socket. See it flashing? ! Then you must smell burning, too, right?
2. Then look at the status of the LAN light: it is not on. The network card must have failed to find the modem. Check whether the network cable is loose; Blinking may be due to poor contact. Check whether there is an oxide layer on the cable connector (also called "crystal head") (if the metal contact part has no metallic luster, there is an oxide layer) and scrape it off with a knife/toothpick, or whether the interface metal reed is deformed. You can put the paper under the reed or pick it up with something else.
3. Finally, check the link indicator status of the modem.
If the link light doesn't work, we need to check whether the mobile phone is broken. If there is no sound on the mobile phone, it is a telephone line problem. After inspection, there is nothing wrong with the indoor telephone line. You need to call 10000 immediately to report the telephone line failure. If the phone is noisy, unplug the extension and try again. No, the telephone line goes directly into the modem without going through the voice filtering separator: OK, go to the computer city and buy a low-impedance voice filtering separator to wear; Still no good, call 10000 to report the telephone line failure. If the link is flashing, it may be that the telephone line is in poor contact. The inspection method is the same as the flashing LAN light, but the circuit is different.
4. The above indicators are all normal, and further tests are needed: first, make clear the IP address corresponding to your modem model and what operating system it is, then click Run in the start menu, enter "cmd" (the input "command" of WIN 98/ME) and press enter, open a DOS window, enter "ping your modem's IP" and press enter.
Take my D-LINK as an example: "Reply from192.168.1:bytes = 32 time = 9mttl = 251"Everything is fine. If you can't get online, it's a problem with the network protocol or the computer itself, so you need to reinstall the TCP/IP protocol or dial.
The "Request Timeout" connection timed out, and the modem needs to be turned off for 5 minutes before being turned on. If it doesn't work, press the "Reset" button of the modem for 3 seconds, and then turn it on again. It's done.
Host not connected cannot find the host. There may be a problem with the network card/slot or modem. Change the PCI slot of the network card (as far away from the graphics card slot as possible) or the network card. If not, change the modem.
If all the above attempts fail, then it is not a fault that we can handle ourselves. Remember to call 10000 to report the network failure in time.
B frequently dropped calls
1. First check whether the modem telephone line and network cable interface are loose, and then pick up the receiver to listen for noise. If there is a line problem, please report it to 10000.
2. See if there is an extension on the phone. If so, please delete it and try again. Or a direct minimization system (i.e., the telephone line does not pass through the voice filtering separator and the telephone).
3. Enter the modem configuration interface (see above for the IP, user name and password of the modem) and check the values of ATTN (line attenuation) and SNR (noise tolerance). Generally speaking, the recipient
4. Anti-virus (Kaspersky or Norton is recommended).
5. Touch whether the modem is too hot (the normal working temperature of the modem should be lower than 60 degrees) or whether there is a mobile phone next to the modem.
By the way, Chengdu Telecom is now engaged in free speed-up activities. Let's check whether their telephone lines are old or too far and too long. If so, it is best not to accelerate. Not all free lunches are so delicious.
C. Low network speed
1. Antivirus, 2. Update your virus database frequently.
3. Go to the configuration interface of your modem (see the IP, user name and password of the modem above) to check the uplink and downlink rates. Because ADSL is an asymmetric transmission mode between uplink and downlink, you only need to look at the downlink speed. Since TCP/IP protocol and other auxiliary protocols occupy a certain amount of bandwidth, their value may be more than your bandwidth. As long as the deviation is within one place, there is no problem.
4.4. The DNS(6 1. 139.2.69) delay of Pingtong Telecom should be below 30ms. (That's the final average = * * milliseconds)
5. Don't upload while downloading, or turn on the camera to play games. It is best not to choose Netcom's servers to download things or play games (Beijing, Tianjin, Hebei, Henan, Shandong, Shanxi, Heilongjiang, Jilin, Liaoning, Inner Mongolia).
6. If it really doesn't work, call 10000. If you are lucky, you can meet expert guidance.
D. unable to browse
Unable to browse means that you can dial normally, but you can't open the webpage.
1. Anti-virus, upgrade virus database.
2. See if QQ can be used normally (QQ only needs IP without domain name) or whether "61.139.81.1"can be turned on. If QQ can be used normally, you can open 6 1. 1.65438+.
3. Click "Run" in the "Start" menu, enter "cmd" (the input command of win 98/me), press "Enter" to open a DOS window, and enter "ipconfig/all" [98/me] as the input "winipcfg", and a dialog box will appear. Check whether the last four lines of values "IP address, subnet mask and default gateway DNS server" are missing. If so, it is likely that your network card is not correctly assigned to the IP of DNS. Take it easy. Then continue to enter "ipconfig/release", and see that the above four items all show "0.0.0.0", and finally "ipconfig/renew", and a new IP appears. It's done. For 98/me, just click "Publish All" and then "Update All" in the dialog box.
If IE is broken, it will be more troublesome. In addition to repairing the registry, you only need to repair IE or reinstall the system. First, try a different browser, such as MSN or the older "Oriental Netscape". MSN or "Oriental Netscape" is definitely slower than IE, but if you can use these browsers to open web pages, it will unfortunately be confirmed (Tencent TT is also a browser, but it is recommended not to use this test because it is based on IE). Bite your teeth. If you can't fix it, fix it. Do not wait any longer.
The rice is finished.
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