how to generate barcode in c#.net with example Modem Diagnostics in C#.NET

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Modem Diagnostics
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When you query a modem, Windows XP Professional runs the commands and displays the results, as shown in Table 25-6. You can verify whether your modem is working properly by using the diagnostic queries that are available by means of Phone and Modem Options in Control Panel.
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Table 25-6 Command ATQ0V1E0 AT+GMM AT+FCLASS = AT#CLS= ATIn
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Modem Query Commands and Responses
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Response Initializes the query. Identifies the modem model (ITU V.250 recommendation is not supported by all modems). Identifies the fax classes supported by the modem, if any. Shows whether the modem supports the Rockwell voice command set. Displays manufacturer s information for n = 1 through 7. This provides information such as the port speed, the result of a checksum test, and the model information. Check the manufacturer s documentation for the expected results.
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Device Manager
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Device Manager provides information about how the hardware on your computer is installed and configured. It can help you determine the source of resource conflicts and the status of COM ports. You can also use Device Manager to check the status of your hardware and update device drivers, such as modem drivers, on your computer.
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25:
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Connecting Remote Offices
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To open Device Manager 1. Right-click My Computer. 2. Click Manage. 3. In Computer Management window, select Device Manager in the console tree.
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Troubleshooting Common Local Area Configuration Problems
The following section describes a common local area related problem that you might encounter, and possible causes and solutions for it. No response when using a local area network connection the lack of response when using a LAN connection:
There are two possible causes for
There might be problems with your network adapter. Check the appearance of the local area connection icon in the Network Connections folder. Depending on the status of the local area connection, the icon appears in different ways. Use Device Manager to verify that your network adapter is working correctly. The LAN cable might not be plugged into the network adapter. If this is the case, a status icon is displayed in the taskbar. Check to make sure the LAN cable is inserted into the network adapter.
Troubleshooting Common Remote Access Configuration Problems
The following sections describe common remote access related problems that you might encounter, and possible causes and solutions for them. Modem not working
The modem is not connected properly or is turned off. Verify that the modem is connected properly to the correct port on your computer. If the modem is external, verify that the power is on. The modem cabling is faulty. Do not use the 9-to-25-pin converters that are included with most mouse hardware because some of them do not carry modem signals. To be safe, use a converter made especially for this purpose. You dialed the wrong number, or you dialed the correct number but forgot to dial an external line-access number, such as 9. Verify that the number is correct as dialed. The modem is incompatible. If you have access to another computer with an Internet connection, check the list of compatible modems in the Hardware Compatibility List link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources. You do not have a valid user account, or you do not have remote access permission. Verify that your user account has been established and that you have remote access permission.
Part IV:
Networking
The telephone line does not accommodate your modem speed. Select a lower bits-persecond (bps) rate or find a direct line. The line you are trying to use is digital. Most modems work only with analog phone lines. Verify that you have analog phone lines installed or, if you have digital phone lines installed, verify that the servers and clients have digital modems. Your modem cannot negotiate with the modem of the server. Try using the same type of modem as the server. The remote access server is not running. Verify that the remote access service is not running. The administrator needs to carefully check the error and audit logs to see why the service stopped. After the problem is fixed, restart the service. If the service is running, the administrator needs to check whether other remote access clients can connect properly. If other clients can connect, the problem might be specific to your workstation.
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