What Are the Benefits of a Broadband Connection?

Broadband connection is used in the description of basic electronic and electronic communication to describe the renewal, or the electronic circuit contains, or can handle a wide frequency range at the same time. It is a relative description method. , The relative increase in transmission data. The upper limit of dial-up Internet connection rate is 56KBps. If it is lower than 56KBps, it is called "narrowband" and the above is called "broadband". For home users, it means that the transmission rate exceeds 1M, which can meet the needs of transmitting a large amount of information such as voice and images. Including optical fiber, xDSL (ADSl, HDSL), ISDN, etc.

Chinese name: Broadband connection

Foreign name: broadband connection

Broadband connection principle

The traditional telephone line system uses the low-frequency part of the copper wire (4kHz below the frequency band). ADSL uses DMT (Discrete Multi-Tone) technology, which divides the original telephone line frequency band from okHz to 1.1MHz into 256 sub-bands with a bandwidth of 4.3khz. Among them, people below 4khz are used to transmit POTS (traditional telephone service), frequency bands from 20KhZ to 138KhZ are used to transmit uplink signals, and frequency bands from 138KhZ to 1.1MHZ are used to transmit downlink signals. DMT technology can adjust the number of bits modulated on each channel according to the condition of the line in order to make full use of the line. The larger the signal-to-noise ratio of the sub-channel, the more the number of bits modulated on the channel, and the poor the signal-to-noise ratio of a certain sub-channel, so it is discarded. ADSL can reach a data transmission rate of 640kbps uplink and 8Mbps downlink. For the original telephone signals, the original frequency band is still used, while ADSL-based services use frequency bands other than voice. The original telephone service is unaffected. ^[1]

Broadband connection type

ADSL Broadband connection ADSL

ADSL is the English abbreviation of Asymmetrical Digital Subscriber Loop (Asymmetric Digital Subscriber Loop). ADSL technology is a new high-speed broadband technology that runs on the original ordinary telephone line. The user provides asymmetrical transmission rates (bandwidth) for uplink and downlink. The asymmetry is mainly reflected in the asymmetry of the uplink rate (up to 640Kbps) and the downlink rate (up to 8Mdps). The uplink (from the user to the network) is a low-speed transmission, which can reach 640Kbps; the downlink (from the network to the user) is a high-speed transmission, which can reach 8Mbps. ^[1]

Cable ModemCM Broadband connection cable modem (Cable Modem or CM)

Cable Modem (Cable Modem or CM) is a technology that uses cable two-way coaxial cable to provide Internet-related application services. The uplink frequency ranges from 5 to 50 MHz and the downlink frequency occupies one or more TV channel bandwidths (6 MHz). ^[1]

DSL Broadband connection DSL

DSL (Digital Subscriber Line) technology is a broadband access technology based on ordinary telephone lines. It transmits data and voice signals on the same copper wire. The data signals do not pass through the telephone exchange equipment, which reduces the load on the telephone exchange. ; And does not need to dial, always online, belongs to the dedicated line Internet access. DSL includes ADSL, RADSL, HDSL, VDSL and so on. ^[1]

VDSL Broadband connection VDSL

VDSL (Very-high-bit-rate Digital Subscriber loop) is a high-speed digital subscriber loop. With VDSL, the maximum download rate in short distances can reach 55Mbps, and the upload rate can reach 19.2Mbps. ^[1]

Broadband connection fiber

The access network adopting the optical fiber transmission technology, that is, the communication system in which all or part of the local exchange office and the user adopts the optical fiber transmission. Optical fiber has the advantages of broadband, strong long-distance transmission, good confidentiality, and strong anti-interference ability. It is the main implementation technology of future access networks. ^[1]

FTTH Broadband connection FTTH

Refers to the fiber-optic pass-through user's home. Generally, only one or two subscriber lines are required. The economy is not good in the short term, but it is the long-term development direction and the ultimate access network solution. ^[1]

FTTX+LAN Broadband connection FTTX + LAN

This is a broadband access solution that uses fiber plus five types of network cables to implement Gigabit fiber to the center switch of the community (building). The center switch and the corridor switch are connected by 100M fiber or five network cables. Wiring, users can access the Internet at speeds up to 10 Mbps, strong network scalability, and small investment scale. In addition, there are multiple access methods such as fiber-to-the-office, fiber-to-the-home, and fiber-to-desktop to meet the needs of different users. The FTTX + LAN method uses a star network topology, and users share bandwidth. ^[1]

ISDN Broadband connection ISDN

ISDN integrated service digital network is a digital telephone network integrated with digital transmission and digital switching. The English abbreviation is ISDN. It can implement the digital signal of the user end into the network, and can provide end-to-end digital connection, so that it can use the same network to carry a variety of voice and non-voice services. The ISDN basic rate interface includes two 64Kb B channels and a 16Kb D channel that can work independently. ISDN 2B + D port and one B channel can be used to access the Internet. The speed can reach 64Kb / s, which is 2.2 times faster than ordinary telephone dialing methods. The transmission rate of the Modem is 28.8Kb / s). When the two B channels are used together through software, the communication rate can reach 128Kb / s. ^[1]

DDN Broadband connection DDN

It is composed of optical fiber digital circuits, digital multi-use and cross-connect equipment, and provides users with all-digital, fully transparent, high-quality data dedicated line transmission channels at various speeds below 2M, which can meet the needs of users in setting up medium and high-speed computer networks. Provide TDM point-to-point dedicated line, broadcast multipoint dedicated circuit, two-way multipoint dedicated circuit and voice dedicated line circuit. ^[1]

Broadband Connected Packet Switched Network

Adopt the "store-and-forward" switching method to provide users with switched virtual circuits (SVCs) and permanent

Broadband connection Virtual circuit (PVC) services have error checking and retransmission functions and automatic routing and routing functions, enabling different types of terminal access. ^[1]

WEB VOD Broadband connection WEB VOD

Through a telephone line, you can watch interactive multimedia programs on a home TV (with a set-top box) or directly with a PC (high-speed access), and it is your choice and whatever you want. ^[1]

ADSL Broadband connection ADSL virtual dial

Dialing on ADSL digital line is different from dialing by modem on analog telephone line. Special software PPP over Ethernet is used. After dialing, it is directly verified by the authentication server. The user does not need to enter the username and password. A high-speed user number is established; the corresponding dynamic IP is assigned. The virtual dial-up user needs to verify the identity through a user account and password. This user account, like the 163 account, is selected by the user when applying. Since the user permissions are classified into A and B, the user account is also divided into two. Class, and this account is restricted, and can only be used for ADSL virtual dialing, not for 169 ordinary modem dialing. ^[1]

ADSL Broadband connection ADSL leased line

ADSL leased line access is another of the ADSL access methods. It is different from the virtual dial-up method, but uses a leased line-like access method. After the user connects and configures the ADSL MODEM, the network settings are set on his PC Set the corresponding TCP / IP protocol and network parameters (IP and masks, gateways, etc. are assigned by the central office in advance). After powering on, the user terminal and the central office will automatically establish a link. ^[1]

Broadband connection installation

Step 1: After installing the hardware, we choose to run the WindowsXP Connection Wizard from the Start menu (Start-> Programs-> Accessories-> Communication-> New Connection Wizard). Because the WindowsXP Start menu is more than the original series of Windows systems

installation steps With the intelligent adjustment function, the frequently used programs are automatically placed in the front menu, so the order may be different from ours. Windows XP also runs the connection wizard during the installation process, and you can also set it during the installation. ^[1]

Step 2: After running the connection wizard, the "Welcome to the New Connection Wizard" screen appears, as shown in the figure below, directly click "Next" ^[1]

Step 3: Then we choose the default "Connect to the Internet" and click "Next"

Step 4: Select "Set up my connection manually" here, and then click "Next"

Step 5: Select "Connect using a broadband connection that requires a username and password" and click "Next"

Step 6: You will be prompted to enter the "ISP name", here is just a connection name, you can enter it casually, for example: "zjjs", and then click "Next" ^[1]

Step 7: Here you can choose whether this connection is for use by any user or only for your own use, click "Next" directly

Step 8: Then enter your user name and password (be sure to pay attention to the format of the user name and password and the case of the letters), and follow the instructions of the wizard to set other security aspects of Windows XP for this Internet connection, and then click "Next " ^[1]

Step 9: At this point our virtual dial setting is complete.

Step 10: After clicking "Finish", you will see an additional connection icon named "zjjs" on your desktop.

Step 11: After confirming that the user name and password are correct, click "Connect" directly to dial up. ^[1]

After the connection is successful, two computer connection icons will appear in the lower right corner of the screen! Due to various irresistible factors, every netizen may have encountered a system crash and have to choose to reinstall your operating system. After reinstalling the system, follow the instructions above to reinstall the dial-up software and establish a dial-up connection. ^[1]

Broadband connection term

ADSL (ASYMMETRICAL DIGITAL SUBSCRIBER LOOP) Asymmetric Digital Subscriber Line

B-ISDN (BROADBAND ISDN) Broadband Integrated Services Digital Network

CATV (COMMON ANTENNA TELEVISION) shared antenna TV

CPE (CUSTOMER PREMISES EQUIPMENT) user terminal equipment

DQDB (DISTRIBUTED QUEUE DUAL BUS)

FDDI (FIBER DISTRIBUTED DATA INTERFACE) fiber step-by-step data interface

GEN (GLOBAL EUROPEAN ATM NETWORK)

HDSL (HIGH SPEED DIGITAL SUBSCRIBER LINE)

HDTV (HIGH DEFINITION TELEVISION)

IETF (INTERNET ENGINEERING TASK FORCE)

ISDN (INTERGRATED SERVICES DIGITAL NETWORK) Integrated Services Digital Network

KBIT / S (KILOBITS PER SECOND)

MPEG (MOVING PICTURE EXPERTS GROUP) animation expert group

BS (BROADCAST SERVICES) broadcasting services

NTSC (NATIONAL TELEVISIONS SYSTEMS COMMITTE)

NVOD (NEAR VIDEO ON DEMAND) near video on demand

OAM (OPERATION AND MAINTENANCE) operation and maintenance

PPV (PAY PER VIEW) pay to see

TCP / IP (TRANSMISSION CONTROL PROTOCOL / INTERNET PROTOCOL) Transmission Control Protocol / Internet Protocol

PEAN (PAN EUROPEAN ATM NETWORK)

QOS (QUALITY OF SERVICE)

QVOD (QUASI VIDEO ON DEMAND) quasi video on demand

RAQ (RESEARCH AND DEVELOPMENT IN ADVANCED COMMUNICATIONS TECHNOLOGIES IN EUROPE)

RBOC (REGIONAL BELL OPERATING COMPANY)

SONET (SYNCHRONOUS OPTICAL NETWORK)

TVOD (TRUE VIDEO ON DEMAND)

WWW (WORDLE WIDE WEB)

WAIS (WIDE AREA INformATION SYSTEM)

BERLU (BROADBAND ENHANCED REMOTE LINE UNIT) enhanced broadband remote line unit

CCITT (CONSULTATIVE COMMITTEE FOR INTERNATIONAL TELEPHONE AND TELEGRAPHY)

DNS (DOMAIN NAME SYSTEM)

PPP (POINT TO POINT PROTOCOL) point-to-point protocol

IP (INTERNET PROTOCOL)

HFC (HYBRID FIBER COAX) fiber coaxial cable hybrid

MIDI (MUSICAL INSTRUMENTS DIGITAL INTERFACE)

POTS (PLAIN OLD TELEPHONE SERVICE)

QAM (QUADRATURE AMPLITUDE MODULATION) Quadrature AM

QPSK (QUADRATURE PHASE0SHIFT KEYING)

RAID (REDUNDANT ARRAYS OF INEXPENSIVE DISKS) Cheap Redundant Disk Array

STB (SET TOP BOX) set-top box

VIP (VIDEO INformATION PROVIDER) video information provider

VTE (VIDEO INformATION PROVIDER) video transmission engine

ATM (ASYNCHRONOUS TRANSMIT MODE) asynchronous transmission mode

BAN (BROADBAND ACCESS NETWORK) broadband access network ^[1]

Troubleshooting Broadband Connections

(1) Check if the Modem light is normal. "

Whether the ADSLModem is "synchronized". Synchronization is a sign of ADSLModem's normal operation. If the Modem is not synchronized, it is absolutely impossible to dial in to the Internet. Generally, to check whether the Modem is synchronized, it depends on whether the Modem synchronization light is on (not flashing). After the Modem is powered on, wait 2 minutes for the status to stabilize. If the sync light is on (not flashing), the Modem can synchronize.

Broadband connection The flashing of the synchronization light indicates that the Modem is out of sync. There are three main modem models. Their synchronization lights are: Alcatel: LineSync (Modem features: black, flat, a total of 5 lights) Itake TD-2001: WLK (Modem features: black, upright, a total of 6 indicators) ASUS ASUS-STATUS (Modem features: off-white, a total of 5 orange indicators,) found that the above-mentioned synchronization lights flicker, it is recommended to restart the MODEM, or use a straight phone line directly Connect to MODEM, if it still cannot be synchronized, you need to report the obstacle as soon as possible. ^[1]

(Two) check if the network card light is normal

The network card light is a sign that the ADSLMODEM is connected to the computer network card. If it is off, it proves that there is a problem with the connection between the modem and the network card. To check whether the network cable and the modem, the network cable and the network card are loose or incorrectly connected, you can try to plug or replace several times or replace cable. (According to different modems, the corresponding network card light identification is as follows) Alcatel: 10BaseT / MDI-X, Itake TD-2001: LLK, ASUS ASUS: PC ^[1]

(3) Check whether the account password is correct

Confirm that the ADSLModem is normal, but cannot dial up to the Internet. Please record the error code and error prompt after dialing. Note: One of the error messages is the account password. For example: Prompt you to re-enter the account password, or prompt "Loginfail", etc. At this time, first check if there is a problem with the account writing, pay attention to case sensitivity, and whether there is arrears that cause the account to be suspended. ^[1]

(4) Check whether the connection of the separator is normal

There is a lot of noise in the phone when you are accessing the Internet. Check the connection of the telephone line and whether there is an extension or fax machine in front of the splitter. Is the connection with a straight line normal?

(5) Check whether the connection is disconnected normally. When disconnected abnormally, ADSL re-dial will wait for some time before dialing normally.

Sixth, analysis of the 13 major symptoms of malicious web virus and simple repair methods ^[1]

Web viruses that cause damage to Internet Explorer:

(A). The default home page is modified

Broadband connection 1. Destruction feature: The default homepage is automatically changed to the URL of a website. 2. Expression: The default homepage of the browser will be automatically set to a URL such as ******. COM. 3. Elimination method: manually modify the registry, first click Start-> Run-> regedit-> OK, open the registry editing tool, and open: HKEY_LOCAL_USER \ Software \ Microsoft \ InternetExplorer \ Main branch, find the Default_Page_URL key name Set the default home page), right-click in the right window to modify it. Press the F5 key to take effect.

Degree of harm: General

(B). The default homepage is modified 1. Destructive features: The default homepage is automatically changed to the URL of a website. 2. Form: The default homepage of the browser is automatically set to a URL such as ******. COM.

(3). The default Microsoft homepage has been modified 1. Destructive features: The default Microsoft homepage is automatically changed to the URL of a website. 2. Representation: The default Microsoft homepage has been tampered with.

(4) The homepage setting is blocked and locked, and the setting options are invalid and cannot be changed 1. Destructive characteristics: The homepage setting is disabled. 2. Expression: The address bar on the homepage turns gray and is blocked.

(5). The default IE search engine is modified 1. Destructive features: Change the default Microsoft search engine of IE. 2. Manifestation: Search engines have been tampered with.

(VI) Illegal information was added to the IE title bar 1. Destructive characteristics: By modifying the registry, the IE title bar was forcibly added with advertising information to promote the website. 2. Form of expression: What's more on the blue title bar at the top of IE?

(VII). The OE title bar has been added with illegal information destruction features: Destruction feature: By modifying the registry, add the advertising information of the promotion website in the top title bar of Microsoft's integrated email program Microsoft Outlook br] Expression: OutlookExpress blue at the top Title bar adds illegal information. Clear method: (1) Manually modify the registry method: Start-> Run-> regedit-> OK, edit the registry tool, and open it in the following order: HKEY_LOCAL_USER \ Software \ Microsoft \ OutlookExpress branch, find WindowTitle and StoreRoot key name , Set all their key values to null. REGEDIT4

[HKEY_CURRENT_USER \ Software \ Microsoft \ OutlookExpress]

"WindowTitle" = ""

"StoreRoot" = "" Harm: Fair

(8) Illegal website link was added to the right mouse button menu:

Broadband connection 1. Destructive features: By modifying the registry, links to illegal sites have been added to the right-click pop-up menu. 2. Representation: Add link information such as "Home of URL".

(9). The right mouse button pop-up menu function is disabled and abnormal: 1. Destructive features: By modifying the registry, the right mouse button pop-up menu function is completely disabled in Internet Explorer. 2. Expression: Right-click in IE has no response.

(10) The IE Favorites are forcibly added the address link of the illegal website, and the IE Favorites are automatically added the link information of the illegal website automatically. Manifestation: Hiding in favorites. Removal method: Please manually clear it directly, use the right mouse button to move to the illegal website information, right-click the pop-up menu, and select delete. Degree of harm: General

(11). Illegally add a button to the IE toolbar. Expression: There are button icons. How to clear: Click the right mouse button to pop up the menu and select "Delete". Degree of harm: General

Broadband connection

(12). Lock down the drop-down menu of the address bar and add text information. Destructive features: By modifying the registry, the drop-down menu lock of the address bar is grayed out. Expression: Not only make the drop-down menu disappear, but also overlay illegal text information on it. How to clear: (1) Manually modify the registry: Start menu-> Run-> regedit-> OK, open the registry editing tool, and open them in the following order: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ InternetExplorer \ Toolbar branch, on the right Find the "LinksFolderName" key name in the window, set its key value to "Link", all extra characters will be removed, press F5 key to take effect. Degree of harm: mild

(13) The "Source File" item under "View" in the IE menu is disabled. Destroyed feature: By modifying the registry, the "Source File" item under "View" in the IE menu is locked to gray. Manifestation: "Source file" item is not available.

Broadband connection error code

Encyclopedia of Broadband Connection Error Codes.

601 An invalid port handle was detected.

602 The specified port is already open. The com port that the network connection is trying to use is being used by another active network connection or other process (for example, a telephone line monitoring program such as a fax program). Quit applications that are blocking the com port.

603 The caller's buffer is too small.

604 Incorrect information specified. The remote access to the memo pad file and the current Network and Dial-up connection configuration may be inconsistent. If the communication device (such as a serial port or modem) is changed, make sure to reconfigure the Network and Dial-up Connection.

605 Cannot set port information.

606 The specified port is not connected.

607 An invalid event was detected.

608 The specified device does not exist.

609 The specified device type does not exist. The remote access to the memo pad file and the current Network and Dial-up connection configuration may be inconsistent. If the communication device (such as a serial port or modem) is changed, make sure to reconfigure the Network and Dial-up Connection. If the error persists, delete and re-create "Network and Dial-up Connections".

610 The specified buffer is invalid.

611 The specified route is not available.

612 The specified route is not assigned. This error can also occur when the computer is running on a very low resource situation.

613 The specified compression is invalid.

614 Not enough buffers are available. If the error persists, refer to the Windows 2000 error log for detailed warnings or errors.

615 The specified port was not found.

616 Asynchronous request is pending.

617 modem has been disconnected. Wait for Network and Dial-up Connection to finish disconnecting.

618 The specified port is not open.

619 The specified port is not connected. Restart your computer to ensure that all short-term configuration changes take effect.

620 Unable to determine endpoint. The network configuration may be incorrect. Restart your computer to ensure that all short-term configuration changes take effect.

621 The system cannot open the phone book.

622 The system cannot load the phone book. Network and Dial-up Connection uses the rasphone.pbk file located in the% systemroot% \ system32 \ ras folder. Make sure this file is in this folder and restart your network and dial-up connection.

623 The system cannot find the phonebook entry for this connection. Network and Dial-up Connections are in the phone book, but the specified connection entry could not be found. This error should not occur unless another application is using Network and Dial-up Connections and an incorrect connection entry is used.

Step 1: Is there any software such as firewall or 3721 Internet Assistant? If so, please exit (1) Test after firewall and 3721 Internet Assistant: If the problem is solved, "user software problem";

(2) If the fault still exists, proceed to the next step to continue processing;

Step 2: Instruct the user to check the status of the network card and unplug the network cable:

(1) If the fault is resolved, the cause of the fault is "pc hardware problem"; (2) If the fault persists, proceed to the next step to continue processing;

Step 3: If conditions are available (with dial-up software, installation CD (Win98 must have a network card driver disk), it is recommended to delete and then restart:

(1) If the fault is resolved, it is a "pc hardware problem";

(2) If the fault still exists, proceed to the next step to continue processing;

624 The system cannot update the phone book file. Make sure the disk is not full and you have permission to change files.

625 The system found invalid information in the phone book. The phone book file rasphone.pbk may be corrupted, delete it from the% systemroot% \ system32 \ ras folder, then restart "Network and Dial-up Connections" to create a new file.

626 Cannot load string.

627 Cannot find keyword. One of the profiles for Network and Dial-up Connections may contain invalid information. If you are using a modem that is not supported by Windows 2000, you should install and use a supported modem.

628 The connection was closed. If it is a dial-up connection, redial. If you keep getting this message, reduce the initial speed of the modem and turn off the advanced features of the modem. If the problem persists, contact your system administrator. For a Virtual Private Network (VPN) connection, access may be denied due to remote access policies or other authentication issues. Ask your system administrator.

629 The connection was closed by the remote computer. The connection was disconnected for one of the following reasons: 1. Unrecoverable telephone line error 2. Noisy line 3. Disconnected by the system administrator 4. Cannot negotiate properly with the modem on the remote access server at the selected speed. If the redial error persists, reduce the speed of the connected modem and try to redial. Try connecting to another server to determine if the problem is related to the particular remote access server you are calling. Similarly, you can try to connect to the original server through another phone line.

630 The modem was disconnected due to a hardware failure. The link was disconnected for one of the following reasons: 1. An unrecoverable error occurred with the modem (or other communication device). 2. An unrecoverable error occurred on the communication port. 3. The modem cable is not plugged in. To diagnose and correct the problem, do the following: 1. Make sure the modem is powered on and the cable is connected reliably. 2. Make sure the modem is running normally. You can test the command through the control panel.

631 The user disconnected the modem. An operation on the computer disconnected. Redial.

632 An incorrect structure size was detected. If the error persists, refer to the Windows 2000 error log for detailed warnings or errors.

633 modem is in use or not configured for dial-out. In the case of a dial-up network connection, the com port that the network connection is trying to use is being used by another active network connection or other process (for example, a telephone line monitoring program such as a fax program). Quit applications that are blocking the com port. If it is a virtual private network (VPN), you cannot open the VPN device that the network connection is trying to use. If the problem persists, consult your system administrator.

634 Your computer cannot be registered on the remote network. The remote access server cannot register your computer name on the network. This usually appears with the NetBIOS protocol, but it may also appear with TCP / IP or IPX. This error usually occurs when the address is already in use on the network. Contact your system administrator.

635 An unknown error occurred.

636 The device connected to the port is not the expected device. The hardware configuration and configuration settings for the connection may conflict with each other. If you change the communication device (such as a serial port or modem), reconfigure the dial-up connection.

637 A string that cannot be converted was detected.

638 The request timed out. An internal error occurred. Restart your computer to ensure that all configuration changes made in the short term take effect.

639 Asynchronous network is not available. NetBIOS network configuration may be incorrect. Restart your computer to ensure that all recent configuration changes take effect

640 A NetBIOS related error occurred. The modem cannot negotiate the connection at the set speed, set the initial speed of the modem to a lower value, and then redial. You can also try disabling modem compression and software compression. If the connection cannot be established yet, try adding the ipx / spx, NetBIOS protocols to the connection.

641 The server cannot allocate the NetBIOS resources required to support the client. Ask the system administrator to increase the resource capacity of the remote access server, or stop some unimportant services, such as the messenger service and network DDE.

A NetBIOS name of the 642 computer is already registered on the remote network. Another computer with the same name has logged in to the remote network. Each computer on the network must be registered with a unique name to verify the following items: 1. The computer with the same name as your computer is not on the network you are connecting to. 2. The computer is not physically connected to the network you are trying to connect to.

643 The network card on the server is faulty. Please report the error to your system administrator.

644 You will not be able to receive network pop-up messages. Another computer connected to the network is using your computer name, and messages written to you are sent to that computer. If you want to receive messages from a remote workstation, you must remember to log off your office computer before dialing into the network the next time. This error does not affect messages sent by outlook, outlook express, or exchange.

645 An internal authentication error occurred.

646 The account is not allowed to log in at this time. Configure accounts for restricting access to this network. If you need to access the network at different times of the day instead of the currently configured time, ask your system administrator to change the setting.

647 This account is disabled. The user account is disabled. This may be due to repeated failed login attempts or the system administrator has disabled the account for security reasons. Ask your system administrator to enable accounts in Local Users and Groups. 648 The password for this account has expired. If you connect through Network and Dial-up Connections, you will be prompted to change your password. If you use rasdial to connect, you can change the password as follows: 1. Press Ctrl + Alt + Del 2. Click Change Password and follow the prompts. If you are a system administrator but your password expires, you The password cannot be changed and can only be changed by another administrator.

649 Account does not have dial-in permissions. Due to the following reasons, the account does not have the right to dial in: 1 You have a valid account in the selected domain, but the account does not have access to the remote network. Ask your system administrator to enable dial-in permissions for the user account, or enable dial-in permissions in Routing and Remote Access. 2. The account is either expired, disabled, or locked or dial-in access is locked. An attempt was made to connect outside the allowed server logon time limit, or an attempt was made to connect outside the time limit of allowed dial-in access, or a policy applied to the account may not allow dial-in access. 3 The caller's ID rules may be preventing the connection, for example, requiring an account to be dialed in from a specified number. 4 The remote computer may only allow connections from local accounts. 5. An authentication protocol is required and the computer cannot negotiate this protocol, or the computer is trying to use a protocol that has not been verified by a policy on the remote computer. If you have an account with dial-in permissions in another domain, do the following to use an account on that domain. 1. Right-click the connection and click Properties. 2. On the Options tab, select the Prompt for name, password, certificate, and so on, and the Windows logon domain check boxes. 3. On the Security Measures tab, clear the Automatically use my Windows login and password (and domain, if available) check box, and then click OK. 4. Double-click the connection, and then click Dial. 5. Specify the appropriate username, password, and domain.

650 The remote access server is not responding. This error can be caused by any of the following conditions: 1. The remote access server is not running. Contact your system administrator to ensure that the server is running. 2. The line is too noisy, or the modem cannot properly negotiate with the modem of the remote access server at the selected speed. For either possibility, reduce the modem's initial speed (bps) and redial. 3. Check the "Hardware Compatibility List" to make sure your modem is listed. 4. The modem's serial cable may need to be replaced. 5. The authentication settings used for the connection may be incorrect. Contact your system administrator to ensure that your authentication settings meet the requirements of the remote access server. 6. The software compression of the remote access server and the hardware compression of the modem may be enabled at the same time. Normally, remote server software compression is enabled and hardware compression is disabled.

651 The modem reported an error. The modem (or other device) reported an error. If it is a dial-up connection and you are using a supported external modem, turn off and restart the modem. Shut down and restart.

652 There was an unrecognized response from the modem. The message returned by the modem (or other device) is not listed in one or more of your script files (Pad.inf, Switch.inf, or filename.scp). If you are using a supported external modem, shut down and restart the modem, then redial. If the problem persists, try to connect at a lower initial speed.

676 phone line is busy. Redial the number. Automatic redial is implemented in the Options tab of the connection properties. For a virtual private network (VPN) connection, check the host name or IP address of the target server and try the connection again. Also contact your system administrator to verify that the remote server is running.

678 The server did not answer. The modem or other device did not go off-hook. Check the number and dial again. For a virtual private network (VPN) connection, check the host name or IP address of the target server and try the connection again. Also make sure that the telephone line (network cable) is plugged into the correct slot of the modem (network card).

679 The system cannot detect the carrier. The modem or other device did not go off-hook. If the remote modem is not off-hook, many modems return this error. Check the number and dial again. Automatic redialing is available in the Options tab of the connection properties.

680 There is no dial tone. The phone line may be incorrectly connected to or disconnected from the modem. A telephone number requires a prefix to access external lines, such as 9, or the number is too long. Make sure the phone cord is plugged into the correct slot of the modem. Also make sure you add any special access numbers connected to the outside line, such as the prefix 9 followed by a comma. For example: 9,555 * 0100. Check the phone line for stuttering tones that indicate voicemail messages. Many modems cannot dial more than 34 digits. When encountering longer numbers, these modems split it into two or more strings, dialing only the first string (incomplete). This happens in Robotics and Multitech's demodulator. The only known solution to this problem is to use another brand of modem.

691 Access is denied because the username and / or password is not valid on this domain. User account was not registered with the listed domain, password expired, or information was entered incorrectly. If no domain is specified, the remote access server attempts to verify the username and password in the domain for which it is a member. Please carefully retype your username, password, and domain. If you are not sure of this information, consult your system administrator. ^[1]

Process:

(1) Incorrect username and password

(2) If the user account password is filled in correctly, proceed to the next step; it is recommended to rebuild the dialing software (if you do not understand how to install the dialing software, you can refer to the user to retry):

If it is normal after reinstalling the dialing software, the reason is "Dialing software is missing";

If the fault persists after reinstalling the dial-up software, please call customer service phone 10000 Telecom (10060 Netcom / 10050 Tietong) to report the obstacle.

The 692 modem has a hardware failure. The modem (or other device) is not responding for the following reasons: The modem is turned off, has failed, or is not reliably connected to the computer. To resolve this issue: 1) Reset the modem. For more information, consult your hardware documentation. 2) If you are using an external modem, make sure you use a suitable serial cable, and the cable connection is reliable. You may want to try replacing the modem cable. Similarly, if you are using an adapter to connect an external modem to the serial port, make sure that the adapter is wired correctly for modem communication. For example, a 9- to 25-pin adapter for a mouse does not work correctly with a serial network connection. 3) Test the serial port or multi-port adapter and replace if necessary. 4) Make sure the modem's handshake options are configured correctly. Consult the hardware documentation for information on the different handshake options available for your modem. 5) If Network and Dial-up Connection does not support your modem, switch to a supported modem. 6) Verify that other applications (for example, "HyperTerminal") are not using the communication port. If this port is in use, the subsequent launch of Network and Dial-up Connections may cause this message to appear. ^[1]

695 The state machine has not been started.

696 State machine started.

697 Response cycle not completed

Error 651 (the modem reported an error) Check the status of the network card-click "My Computer" right-click properties, and in the "Device Manager" of "Hardware", look for "Network Card" or "Network Adapter". Enable, if there is an exclamation point or question mark, it is because the driver of the network card has a problem. You need to reinstall the driver of the network card. If nothing, it proves that the network card is normal. ^[1]

Error 741: Caused by the need to select encryption or maximum strength encryption in data encryption.

Solution:

1. First enter the broadband connection of win8 system, then right-click and select "Properties";

2. In the interface that pops up, switch to the "Security" tab, then select "Do not allow encryption" or "Optional encryption" in the red line area below, and then click OK to solve this problem. ^[2]

Broadband connection extended reading

Broadband connection service characteristics

High speed: The transmission rate can reach up to 640Kpbs in the uplink and up to 8Mbps in the downlink, which is much higher than the dial-up mode. Low rate: Only the network usage fee is charged. Excellent function: Phone and Internet services are provided on one telephone line at the same time. The phone and the Internet do not affect each other. Simple installation: In the case of existing telephone lines, as long as an ADSL MODEM and a voice splitter are installed, there is no need to make any changes to the lines. ^[1]

Broadband connection services

PPPOE: PPPOE dial-up software is required to verify user account names and passwords every time you access the Internet, similar to the narrowband registration dial-up service. The rate of the PPPOE method is lower than the fixed IP method, which is more suitable for individual users.

Fixed IP: The computer is "always on", as long as the computer and ADSL MODEM are turned on, you can access the Internet without entering a user name and password for verification. The fixed IP method is suitable for small businesses and Internet cafe users. ^[1]

Broadband connection business application

1. When the user goes through the network access or change procedures, he only needs to bring the ID card and photocopy of the owner of the phone, and the ID card and photocopy of the operator. 2. When filling in the business application form, please fill in the user application form with standard fonts, with neat fonts and clear handwriting. 3. In order to ensure timely installation for you, it is recommended that you fill in the contact phone number when leaving the business and leave more than two contacts at any time, so that we can install and install it for you in the shortest time. 4.Our company will open the ADSL service for you within 2 working days after the completion of your business application procedures. 5. From the date of filling in the application form, if it has not been installed within one month, it is considered to be automatically disassembled. If you need to apply, please go to the business window to apply again. 6. If the terminal equipment is leased by the communication company free of charge, the property rights of the equipment still belong to the communication company, and the user must return the terminal intact after disassembling the machine. ^[1]

Broadband connection installation preparation

Individuals and office users (single computer users) 1. Prepare a Pentium 586 or more computer with Microsoft operating system and ensure its normal operation. 2. The operating system is recommended to use WIND0WS98, WINDOWS2000, WINDOWS XP produced by Microsoft. 3. Prepare a 10M / 100M adaptive network card and install it by yourself so that it can be used normally. 4. If ADSL access is carried through a telephone line, please make sure that the telephone line is connected to your computer before installation. ^[1]

LAN users such as Internet cafes and organizations need to configure and install proxy servers or routers.

Broadband connection guide

ADSL dial-up software settings and usage methods: Windows XP, Microsoft's PC graphics operating system, more powerful, integrated PPPoE protocol support, our broadband users do not need to install any other PPPoE software, simply use the Windows XP connection wizard to easily To create your own broadband virtual dial-up Internet access file, the actual use effect is exactly the same as PPPoE under Windows 9x / Me / NT / 2K, because it is more closely integrated with the operating system, and more convenient to use. ^[1]

Broadband Internet users

As of June 2010, the number of Chinese Internet users has reached 420 million, of which the number of broadband Internet users was 36.381 million. The penetration rate of broadband among those using computers to access the Internet has reached 98.1%. ^[1]

Broadband connection question and answer

1.ADSL access method

Virtual dialing, that is, using ADSL "cat" (virtual) dialing, when dialing is similar to ordinary 56k "cat" dialing, IP is automatically assigned; dedicated ADSL access, using static IP. ^[1]

2 Will ADSL degrade the quality of phone calls, and whether the call will result in a decline in Internet speed

ADSL uses frequency division multiplexing technology to separate voice and data. Although they are on the same phone line, voice and data operate on different frequency bands, so they do not interfere with each other. Even if you surf the Internet while you are on the phone, there will be no decline in Internet speed and call quality. ^[1]

3 Whether ISDN can retrofit ADSL

Although the carrier medium is copper core wire, the voltage and signal coding of ISDN telephone lines are different, and cannot be changed to ADSL for the time being. ISDN must be converted into a normal direct line telephone before ADSL access. ^[1]

4 How to install extension telephone or other equipment on ADSL line

The ADSL filter splitter is best connected to the telecommunication bus entrance, and then the telephone port branched from the splitter is used to expand the telephone extension. Of course, it can also be connected to the extension port in theory. Other electronic devices (telephones) are incorporated between the splitter and the splitter. These devices will interfere with ADSL communication. Because ADSL has high requirements for line quality, it may affect the normal operation of ADSL. Generally, it is behind the line from the splitter Then install the extension. ^[1]

5 The place of use is far from the telecommunications office (telecommunications branch office). Can I install ADSL?

The distance between ADSL technology and the telecommunications bureau is less than 5 kilometers, so it depends on the situation. Because ADSL has higher requirements for the line, in order to ensure the communication quality, this network believes that it is better than 3KM. ^[1]

6 Will ADSL drop like normal 56K Modem?

When any connected device is faulty, ADSL will also be dropped, but as long as the line quality is good, the chance of dropping is still very small. ^[1]

7 ADSL uses ADSL line, why didn't I see the telecommunication office to change the line after installation?

In fact, the physical media used by ISDN lines, telephone lines, and ADSL lines are ordinary telephone lines, but the signal formats inside are different. The telecommunications bureau will change the lines for you and will not replace the lines themselves, but only connect the telephone lines in the telecommunications office room To different devices, it is invisible to the end user. ^[1]

8 On ChinaNet, dial 163. What is the number for ADSL virtual dialing?

Virtual dial-up users: ADSL virtual dial-up does not need to dial a real phone number, and the cost is not related to the telephone service. The user only needs to enter the account number and password, and obtain a dynamic IP address through identity verification, and then can access the Internet. Dedicated line users: ADSL can access the Internet and make calls at the same time. Making a call is the same as a traditional phone, dialing the other party's number, but you don't need to dial the Internet. Users only need to connect the power of ADSL and turn on the computer to access the Internet. ^[1]

9 Should the computer buy new parts

Yes. Due to the high speed of ADSL, users need to insert a network card into the computer (usually a ten-megabit Ethernet card with an RJ45 connector). ^[1]