ADSL (Asymmetric Digital Subscriber Loop Asymmetric Digital Subscriber Loop) is a member of xDSL family, and is praised as "the express train on the modern information superhighway" by developed countries such as Europe and America. Because of its high downlink rate, wide bandwidth and excellent performance, it is deeply loved by users, and it has become a brand-new faster and more efficient access mode after MODEM and ISDN, and it is also the most used access mode in China at present.

Abnormal failure in ADSL use

In the process of using broadband network, we often encounter some thorny problems, which lead to the inability to surf the Internet normally and affect our work, study and entertainment. The following provides some reference solutions for some common problems in ADSL broadband use.

1. When using ADSL modem with USB interface, you can't connect to dial-up.

Phenomenon and Cause Analysis: Generally speaking, this situation is due to the short initial start-up time due to the USB modem supplying power through the USB interface, the network equipment is not activated or the line is not activated, that is, the ADSL modem is not activated, which leads to the line being blocked.

Solution: When similar problems occur, we can wait patiently for 30 seconds to several minutes before trying to connect. Sometimes it can be connected as soon as it is turned on, and sometimes it takes several minutes to activate or restart. If the line has been unable to be activated, there may be a problem with the network connection. Please call the local telecommunications bureau in time, which is rare.

2. I have been using a good ADSL modem, and suddenly I can't get online.

Phenomenon and Cause Analysis: There may be many reasons for this problem. If hardware damage and line damage are excluded (the probability of this situation is very small), the main reasons may be: First, the network equipment is overheated and unstable; Second, automatic disconnection during IP adjustment; Thirdly, the network system of the telecommunication bureau crashed, which is very unlikely, but I have met it twice.

Solution: If the network equipment is overheated and unstable, generally speaking, the equipment can be automatically connected immediately; Because the ADSL modem has a relatively high calorific value, it feels very hot. In order to work stably, it should be placed in a well-ventilated place. Because the IP address of ADSL is dynamically allocated, sometimes the IP of ADSL will be adjusted and suddenly dropped. This situation generally does not need attention, and it can be automatically connected after a few seconds. If there is no connection, press the reset IO key to turn it off, then start it again, and you can connect. If none of the above methods can solve the problem, you can call your ISP to determine whether there is a problem in the network center.

3. The problem of slow network speed

Generally speaking, the speed of 1MB ADSL broadband should be enough for our daily use (except HD video on demand) or for several people, but sometimes it is very slow to open the web page.

Phenomenon and reason analysis: first, it may be that individual WEB servers are busy. If opening other web pages is not slow, there should be no problem with the network. The network speed is very slow because individual web servers are busy. Secondly, it may be the compatibility between dialing software and working system. Thirdly, it may be the problem of line quality or distance, because ADSL uses telephone lines, and if the distance is too long, there will be signal attenuation, which will slow down the network speed.

Solution: We can't solve the problem that individual WEB servers are busy. I suggest you try again later. In the use of dialing software, if you use Windows XP* as the system, the system comes with dialing tools, and no additional dialing software is needed. If you use other systems, it is recommended to use RASPPPOE dialing software. If it is because of the line quality or distance, please contact the relevant telecommunications bureau (the district office that installs and debugs ADSL for you at home, and leave your contact information when installing).

ADSL broadband access problem

1. A friend uses an ADSL modem with an Ethernet interface to surf the Internet, and then sets up a local area network with several machines through HUB or switch, and then enjoys the solution of surfing the Internet.

Let's take the use of Shida ADSL2 1 10-EH modem (with routing function) as an example to introduce the relevant settings. The default IP of a modem is192.168.10.1. As a client (every machine connected to a hub or switch), TCP/IP protocol and IPX/SPX protocol of LAN need to be installed after the network card is connected to the hub or switch. Then you need to set the IP address to192.168.10. X, the same as the domain where the modem is located. The subnet mask is 255.255.255.0, and the default gateway is192.168.10.65438.58886 Other options can be selected by default.

If you use Startech 5800U and similar ADSL modem with USB interface without routing function, you can actually enjoy the Internet. One of the machines connected to ADSL modem is a host, and like other machines, it is connected to a hub or switch through a network cable. On the host, IP address192.168.0.1,subnet mask 255.255.0, default gateway:192.168.0.1 As a client, you only need to surf the Internet through the local area network. If it is a WINXP system, you can surf the Internet without setting. The main disadvantage of this method is that the performance of the machine as a server is better, and once the server is closed, other users can't surf the Internet.

The two computers were originally interconnected by a network card, but later one of them was connected to broadband. Is there any way to connect the other computer to broadband?

There are three main ways to solve the problem of * * * enjoying the Internet: connect the broadband network wiring directly to the hub or switch by using the hub or switch, and then connect it to the hub or switch through the network cards of two computers, so that you can enjoy the broadband through the * * * sharing software; Secondly, install a network card on the machine that has been connected to broadband, use it to connect with the network card of another computer, and enjoy the software and the Internet through the network. Thirdly, if you have relatively abundant funds, you can choose a broadband router, connect the broadband network cable of Netcom to the WAN port of the router, and then connect two computer network cards to the LAN port of the router. If the PPPOE dialing function of the router is configured, any computer can surf the Internet independently.

Do 1 ADSL devices need special drivers?

Answer: No, just install any software that conforms to the PPPoE protocol, but the driver of the network card still needs to install non-standard ADSL (except USB and built-in ADSL card).

Why is the startup speed slow after installing PPPoE software of ADSL?

Answer: This has something to do with your network card settings. Because the system needs a legal IP when it starts, it is necessary to set up a DHCP server correctly in the LAN. If it is used alone, it can be solved by specifying a non-routable IP for the network card, such as: 192. 168.xxx.xxx, subnet mask: 255.255.0.

5 Why is my PPPoE software installed and working normally, but I can't list the service items of the ISP?

Answer: First, check whether the hardware connection is correct and whether the ISP is providing services. These can be judged by observing the display state of synchronous working light of ADSL modem. If the synchronous working light works normally, check whether other devices in the computer interfere with ADSL and upgrade its driver. We have encountered the situation that PPPoE software can't list the service items correctly because of the old driver of sound card. Another thing to note is whether the ISP has opened your service. Because ADSL still has some special numbers tied in the telephone exchange, ISP needs to authenticate these numbers to think that your line is legal and available, and the ADSL access server of ISP is not open, you can't list the server items.

Why can't my PPPoE software be installed normally?

Answer: Generally speaking, it is necessary to check whether the driver of the network card is installed correctly, whether other PPPoE software is uninstalled before installation, and whether other network software such as * * * Internet software is installed in the system. If it is best to uninstall, PPPoE will install them after installation. For WinPoET(RASPPPoE), it is also necessary to check whether the dial-up networking components of the system are installed correctly.

I want to use a proxy server to access the website when surfing the Internet. How should I set it?

Answer: Enternet works completely independently, so you need to set up a proxy server to use the LAN proxy service. WinPoET and RASPPPoE work together with dial-up networks, so it is necessary to set up a proxy server in the proxy settings of their dial-up connections, just like ordinary dial-up settings.

8 why can't I use Vicomsoft's Internet gateway to complete virtual dialing?

Answer: The Internet gateway itself has PPPoE support, so you can't install any PPPoE software such as Enternet300.

After the Windows 2000 installation protocol is completed, there are no PPPoE-related items in the network properties.

A: Go to Computer Properties, Hardware and Digital Signatures and close the "Prohibit unsigned driver files" item.

10 RASPPPOE.EXE operation prompts that no network card is selected.

A.RASPPPoE only supports standard Ethernet protocol, PPPoE protocol and hardware devices, and does not support USB or built-in ADSL card with its own driver.

B under B.Windows 9x, please check whether the protocol of the connection and network card is correct. If the problem persists, please try to reinstall the related hardware and software.

C. under C.Windows 2000, check whether the "status" of the "local area connection" object connected to ADSL is disabled and enable it.

D. Under D.Windows 2000, check whether the PPPoE related items of network properties are selected.

1 1 My ADSL, the system is NT4.0 SP3, WinPoet virtual dialing. After reloading once, many sites can't be browsed, some sites can't be browsed today, and they can't be browsed tomorrow. You can Ping or Telnet to port 80, but you cannot use a browser. We use Wingate proxy to surf the Internet, but the client can't get on. What may have happened? Is it my setting or the telecommunication bureau's? Has anyone ever been in a similar situation?

A: I suggest you make a simple judgment according to the following steps:

(1). Friends with multiple computers can switch to other computers. The replaced computer does not need any proxy server software, but only needs a network card to directly connect with ADSLMODEM. After installing ADSL dialing software correctly. See if you can browse normally. If so, the fault is caused by the client's computer. If not, you need to check whether the modem and line are normal.

② Friends with only one computer can stop running all proxy server software, such as WINGATE /SYGATE. , log in directly to see if the fault can be eliminated. If the fault is eliminated after stopping running the proxy server software, it must be a problem with the proxy service software.

③ Check whether TCP/IP settings in dial-up network properties, especially DNS server settings are correct. The DNS server in Guangzhou is 202.96. 128.68.

(4) Friends who use WINDOWS can delete the TCP/IP protocol in the control panel/network and add it again after restarting. Many friends who can browse the web normally but suddenly can't browse the web are all caused by TCP/IP protocol errors. After testing, most of them can be solved after reinstalling TCP/IP.

⑤ Change a browser software for browsing test.

⑥ Delete the original ADSL dialing software in the control panel/Add/Remove program, and reinstall other ADSL dialing software. There are three kinds of ADSL dialing software (WINPOET, Ethernet300, Raspppoe) available for download on the homepage of this website: [url]itsc.com[/url].

⑦ If two network cards are installed in the computer directly connected to the ADSL modem, try to pick up the network card connected to the LAN first, leaving only the network card connected to the ADSL modem. Then see if the fault is eliminated. If troubleshooting, you should check the configuration of network and system resources. Especially to see if there is any conflict between the network card and other devices (WINDOWS users can check whether the devices are normal in the control panel/system/device management).

After the above steps, if the fault can't be eliminated, or if you see that the power light or SYNC light of ADSL modem is abnormal (normally, the power should be long green instead of flashing red, and SYNC should be long green instead of flashing), then you should prepare the following information to report the fault to the telecommunications department, and you need to provide the following information to help them judge the fault:

Your ADSL account number

Internet phone number, is it normal to call?

The brand of ADSL modem and whether the indicator light is normal (whether the indicator light is green or red).

Contact person and telephone number

Detailed fault description

12 I have entered my account number and password. Why am I prompted that the password is incorrect?

Answer: When entering a user name, due to the particularity of ADSL technology, the user name format is generally the following format: user account number @ service item name (different ISPs may be different). You can see the list of service items provided by ISP through PPPoE software, and choose as needed.

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System setup and security issues

1 How to stabilize the system?

A: Some systems may have compatibility problems with ADSL-related components. Take Windows 98 as an example, its network components have major defects, and there will be inexplicable network disconnection problems when surfing the Internet. In this case, the best solution is to patch the system. You can directly connect to the Microsoft Update site and select the patches searched by the system to download. After the patch is installed, install the virtual dialing software.

What is the DNS server address of ADSL users?

Answer: ADSL users in Beijing can now set the DNS server as:

Primary Domain Name System: 202. 106.0.20

Auxiliary DNS: 202.106.196.115.

Compatibility between ADSL and Windows XP

A: I don't know what ADSL access equipment you are using. If it is built-in, it may have compatibility problems with XP, while the external one will generally have no problems. However, it should be noted that some ADSL virtual dialing software can't run normally under XP and needs to be upgraded.

How can we improve the network security?

A: In fact, the main reason for the successful implementation of network intrusion behavior is the insecurity of users' own system settings. Therefore, users need to set up their computers safely and correctly, such as prohibiting files and printing, prohibiting loading NETBIOS on TCP/IP protocol, and installing firewall software can also greatly protect users.

Problems related to ADSL modem hardware

1 Can the dial-up modem I am using now be used as an ADSL modem?

Answer: No, ADSL modem is different from current dial-up modem in modulation mode and network structure. The interface with PC is 10BaseT Ethernet interface, not RS232 serial port or parallel port.

Does the signal affect ADSL modem?

Answer: Make sure that the line communication quality is good, there is no interference, and there are no other devices that will cause line interference, such as telephone extensions and fax machines. Never put your mobile phone next to the ADSL modem, because the mobile phone will automatically find the network every few minutes, and the strong electromagnetic interference is enough to cause the ADSL modem to disconnect.

4 ADSL modem driver

Answer: ADSL modems are also divided into two forms: USB interface and local area network (RJ-45 crystal head). The former needs to install the driver, and the latter does not, but the setting methods are similar.

Can ADSL equipment be used like a normal modem?

A: No.

How does asdl modem connect to HUB?

Answer: Turn the switch on the back of the PC to the hub and connect the hub through the same cable.

When are ADSL bridging mode and routing mode used respectively?

A: It depends on the service mode of the bureau. Generally speaking, the bridge mode is used for home users, and the routing mode is used for small offices or Internet cafes.

What if ADSL modem doesn't work properly?

Answer: If it doesn't work properly, try resetting the modem first. If not, please contact the technical staff of the telecommunications bureau or contact us.

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Computer problems

1 Do users need to apply for a dedicated telephone line to install ADSL? What are the requirements for users' computers?

Answer: By installing ADSL, users can either modify the existing telephone line or apply for a second telephone line dedicated to surfing the Internet. There is no difference between installation and use. If you use an existing telephone line, the previous telephone number will remain unchanged. A general 586-level computer will do, and there are no special requirements. Users can use a simple method to judge whether their computers are suitable: they can surf the Internet with ordinary modems, and all computers with acceptable results can surf the Internet with ADSL.

Answers to other ADSL questions:

1 Current ADSL access mode

Answer: Virtual dialing means using ADSL "cat" (virtual) dialing, which is similar to ordinary 56k "cat" dialing and automatically allocates IP; Dedicated ADSL access, using static IP.

Will ADSL reduce the quality of telephone calls? In addition, will making phone calls lead to a decline in the internet access rate?

Answer: ADSL uses frequency division multiplexing technology to separate voice and data. Although they are on the same telephone line, voice and data run in different frequency bands, so they do not interfere with each other. Even if you surf the internet while talking on the phone, the internet speed and call quality will not decrease.

Can ISDN modify ADSL?

Answer: Although the carrier medium is copper core wire, the voltage and signal coding of ISDN telephone line are different, so it cannot be changed to ADSL for the time being. Before ADSL access, ISDN must be converted into ordinary direct telephone.

I want to install a telephone extension or other equipment on my ADSL line. How should I install it?

Answer: It is best to connect the ADSL filter separator to the entrance of the telecommunication bus, and then expand the telephone extension from the telephone port separated by the separator. Of course, in theory, it can also be connected to the expansion port, but this will merge other electronic equipment (telephone) between the bus entrance (that is, the telecommunications bureau) and the separator, which will interfere with ADSL communication. Because ADSL requires high line quality, it may affect the normal work of ADSL, so it is generally necessary to install the extension after the line is separated.

My place of use is far from the computer room of the telecommunications bureau (telecom branch). Can I install ADSL?

A: At present, the distance between ADSL and telecommunication bureau is limited to 5 kilometers, so it depends on the situation. Because ADSL has higher requirements for lines, this website thinks that it is better to ensure the communication quality.

Will ADSL be dropped like a normal 56K modem?

Answer: When any connected equipment fails, ADSL will be disconnected, but as long as the line quality is good, the probability of disconnection is still very small.

ADSL doesn't mean using ADSL line. Why didn't I see the telecommunications bureau change the line when I installed it?

Answer: In fact, the physical media used in ISDN lines, telephone lines and ADSL lines are all ordinary telephone lines, but the signal systems inside are different. Changing the line of the telecommunication bureau will not change the line itself, but connect your telephone line to different equipment in the telecommunication bureau room, which is invisible to the end users.

On ChinaNet, you should dial 163. What number should I dial for ADSL virtual dialing?

Answer: Virtual dial-up users: ADSL virtual dial-up method does not need to dial the real phone number, and the cost has nothing to do with the telephone service. Users only need to enter their own account number and password, and get a dynamic IP address through authentication, so they can surf the Internet.

Dedicated line users: ADSL can surf the Internet and make phone calls at the same time. Making a phone call is the same as making a traditional phone call. You don't need to dial the other party's number when surfing the Internet. Users only need to connect the ADSL power supply and turn on the computer to surf the Internet.

Do I need to buy new parts for my computer?

A: Yes. Due to the high speed of ADSL, users need to plug in a network card (ordinary 10 megabit Ethernet card with RJ45 connector is enough).

10 wants to install ADSL, but is worried about the decline of telephone service quality. In addition, will making phone calls reduce the internet access rate?

Answer: ADSL equipment was designed with this in mind. Frequency division multiplexing technology is used to separate telephone tones from data streams without interference. In the test of the actual line, there is no difference between the voice of the telephone with ADSL and that of the ordinary telephone: while transmitting data information, the transmission rate remains unchanged when lifting the phone, hanging up the phone and talking casually.

1 1 can I connect ADSL equipment to the extension?

A: At present, we can only connect ADSL terminal equipment on a straight line telephone. Because ADSL is to superimpose high-frequency digital signals on the bottom-frequency voice of ordinary telephone lines, adding any equipment to the connection from the telephone company to the ADSL filter will endanger the normal transmission of data, so don't connect telephones, telephone burglar alarms and other equipment in front of the filter.

12 why sometimes ADSL access speed is not much faster than ordinary dial-up modems?

Answer: The reasons for slow ADSL access are as follows: 1) If you visit a foreign site, the access will be affected by the export bandwidth and the configuration of the other site; 2) Because ADSL technology requires high quality of telephone lines, and the widely used ADSL is a kind of RADSL (i.e. rate adaptive ADSL), if the telephone line between the telephone building and users is disturbed by external factors in a certain period of time, RADSL will dynamically adjust the access speed of users according to the line quality and transmission distance.

13 I am an ADSL user, but sometimes I can't surf the Internet normally. What is the reason?

Answer: ADSL is a technology based on twisted pair transmission. Twisted-pair is to wrap two insulated copper wires together according to certain rules, which can effectively resist external electromagnetic interference. However, most telephone lines in the market are parallel lines, from the junction box of the telephone company to the telephone of the user, many lines are parallel lines, which is very unfavorable to ADSL transmission. Non-twisted pair transmission is too long, which will cause unstable connection, DSL light flashing, and affect Internet access. Because ADSL is to superimpose high-frequency digital signals on the bottom-frequency voice of ordinary telephone lines, adding any equipment to the connection from the telephone company to the ADSL filter will endanger the normal transmission of data, so don't connect telephones, telephone burglar alarms and other equipment in front of the filter.

14 why am I slow to open the webpage?

A: There are several possibilities. As mentioned above, it may be caused by large relay data traffic; Second, it may be caused by the other party's server being too far away or the export bandwidth being too small or crowded; Third, it may be related to the machine configuration. Generally speaking, memory size, CPU speed and hard disk speed may all affect the speed of opening web pages.

15 can't surf the Internet?

Answer: First of all, from the physical contact analysis of the network card, check all the network cable connectors to see if they are loose. Secondly, check whether the network card driver in the system is abnormal. If it is not normal, please reinstall its driver. Check again whether its IP settings are consistent with the IP left by the installation and maintenance personnel. If not, please correct it. If the above statement fails to restore its internet access, please go to the telecom broadband network maintenance center.

16 uses ADSL card, but when dialing, the dialing software reports timeout error (trying …) and times out.

A:

1. First, check whether the built-in ADSL card is correctly connected to the separator, whether the connector is loose and whether the network cable is broken. Or are you heavy? Do you want to record it? Hey, hey, hey? Hey? Allow a bath?

2. Next, you can open the "Properties" item of dial-up software (such as EnterNet300), and then select the "Configuration" item to check whether the ADSL card "GB-Link A 1020I ADSL PCI NIC" is correctly bundled in the "Adapter". If not, you can choose if there is no shadow of ADSL card "GB-Link A 1020I ADSL PCI NIC" in this column (as shown in the figure). You can open the Properties of My Network Places and select TCP/IP->; GB-Link A 1020I ADSL PCI NIC, change any settings in the Advanced option, and then restart the computer to correctly identify the ADSL adapter in the dial-up connection.

3. If the problem can't be solved, it's usually the ISP's server or telephone line (ADSL requires high line quality, and the client can't be more than 5 kilometers away from the telephone office), so you can contact the ISP service provider to solve it.

How does 17 ADSL modem transmit high-bandwidth data signal and voice signal at the same time? What is the specific workflow?

Answer: When ADSL is connected, there are three channels on the telephone line, an 8Mbps downlink channel, a 640Kbps uplink and control signal and an ordinary telephone channel with a bandwidth lower than 4KHZ.

Specific workflow: ADSL modem coded signals and low-frequency voice signals are transmitted to the separator equipment of the telecommunications bureau through telephone lines. If it is a voice signal, it is transmitted to the telephone exchange. If it is a digital signal, connect the ADSL local equipment and the Internet.

18 What's the difference between PPPoA and PPPoE?

Answer: PPPoA directly encapsulates PPP and adapts to ATM application layer, while PPPoE encapsulates PPP packets with Ethernet protocol and then adapts to ATM. Generally, PPPoA is used in routing mode, and the authentication process is generally completed by Modem, while PPPoE generally works in bridging mode, and the user PC sends PPPoE requests.

What is the difference between 19 PPPOE software?

Answer: EnerNet300 has an independent dialing function and does not depend on the system;

WinPOET needs * to get system dialing support;

RASPPPOE is just a protocol driver, which depends on the system, just like the old modem dialing method.