Modems, Whenever large files are downloaded, garbage across the connection

The modem drops the connection and gives the NO CARRIER message.

1. Most likely the connection was first dropped by the remote modem. Is someone trying to use a phone extension on this line?

2. Disable call waiting. To do this, put *70 before the dialing number. Some communications software has a setting to disable call waiting. If not, you can put these three characters in the Extra settings box of Advanced Connections Settings.

3. Remove extra equipment from the line and straighten the phone lines.

4. Check the modem settings and make sure “Error control required to connect” is not checked.

5. Try using a different modulation type under Advanced Connection Settings of your modem properties.

6. The remote modem may not support the high speeds used. Try reducing the port speed to 9600 or lower.

When the weather is bad, the connection fails often.

This is caused by a dirty phone line. Remove any extra equipment and straighten the lines.

Whenever large files are downloaded, some of the data is lost.

Make sure that hardware flow control is on, and that software flow control is off, for the software, the COM port, and the modem. ( Use software settings options, the COM Port Properties box, and the Modem Properties box.)

The connection fails whenever large files are uploaded or downloaded.

There may be a buffer overflow. Try these things to gain better control of data flow:

1. Make sure that hardware flow control is on, and that software flow control is off, for the software, the COM port, and the modem.

2. Is the serial port speed set too high for the UART chip you have? Lower the port speed.

3. For an external modem, try a different serial port cable.

You get nothing but garbage across the connection.

1. Check the port settings. Try 8 data bits, no parity, and one stop bit (8, No, and 1).

2. Slow down the port speed.

3. Slow down the modem speed.

4. Try a different modulation type.