barcode generator code in c#.net Diagnosing and Troubleshooting Problems in Software

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Diagnosing and Troubleshooting Problems
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A No Dial Tone Message
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If your screen displays a message saying that your modem does not detect a dial tone, you should first ensure that the cable is properly attached to both the modem and the jack Try unplugging the cable from the jack, then plugging it in again Next, you can test the cable by swapping it with a known good one This problem might also be the cause of a bad phone line Plug a phone into the suspect jack and pick up the handset, as normal If there is no dial tone, the problem is with the phone line If there is a dial tone, the problem is most likely the modem cable Try reversing the modem cable to the telco jack before you replace the cable This may fix the problem in some modems
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The Modem Dials But Cannot Make a Connection
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A modem s failure to connect is usually caused by problems incurred during the handshake phase of the communication process The first step in a modem handshake is that the receiving (answering) device sends a guard tone to indicate that it is indeed a modem (and not a person or a fax machine) If the dialing modem doesn t receive a guard tone, the connection will be dropped Check the phone number you are dialing; you might mistakenly be dialing a regular household or fax number Another step in the handshake process is for both modems to agree on a transmission speed If the two modems don t have a single compatible speed, the connection will be dropped For instance, suppose your modem is able to operate 288Kbps or lower, and the modem at the other end is able to operate only at 366Kbps The modems do not have a common transmission speed, so the connection will not continue The inability to make a connection can also indicate that there is a lot of interference on the line You can test for this by listening for line static using a regular phone If static is present, the problem must be resolved by the phone company Most modems support multiple protocols; however, it is possible that the remote modem you are attempting to connect with is using an incompatible protocol If you are having problems connecting to a single modem, it may be that the system requires a password and username early in the handshake process You may need to provide this in the setup of the communications program that you are using
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The Modem Drops the Connection During Operation, Usually at Random
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The main reason for an otherwise functioning modem to suddenly drop the connection is that it has been interrupted by another call If your phone line has call waiting, ensure that it has been disabled in the modem s dial-up configuration This problem can also
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Symptoms and Problems
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occur if the modem shares a phone line with a regular phone or fax machine If the phone is picked up during a modem session, the modem connection will be dropped
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The Modem Appears to Receive Garbage
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Random garbage, or invalid characters, are typically the sign of a noisy line That is, static (EMI) on the line is being interpreted by the modem as valid data Try using another line, moving EMI-causing devices out of the way, or contacting the phone company In more serious cases, all the data received by the modem can appear garbled This means that the modem is interpreting every bit of data incorrectly and is probably using different communication standards than the modem at the other end Disconnect, then try again; the handshake might be successful a second time If it is not, ensure that dial-up settings, such as baud rate and parity, match those of the other modem Systems that use serial mice may have a conflict between the modem and the mouse Make sure that these resources do not conflict Modems attempt to connect at the highest speed that the telephone line supports In some cases, this may vary from call to call depending on the quality of the phone line If the line becomes too noisy, one end or other of the connection may drop the call You can try setting a slower maximum speed on the modem to verify if the line is the problem
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