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Chapter 6: Troubleshooting

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Disconnect any answering machine, fax machine, or printer that is on the same 
line as the modem. Do not connect these devices to the same telephone line as 
the modem.

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Make sure that you are not using a digital, rollover, or PBX line. These lines do 
not work with your modem.

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Check for line noise (scratchy, crackling, or popping sounds). Line noise is a 
common problem that can cause the modem to connect at a slower rate, abort 
downloads, or even disconnect. The faster the modem, the less line noise it can 
tolerate and still work correctly.

Listen to the line using your telephone. Dial a single number (such as 1). When the 
dial tone stops, listen for line noise. Wiggle the modem cable to see if that makes a 
difference. Make sure that the connectors are free from corrosion and all screws in 
the wall or telephone wall jack are secure.

You can also call your telephone service and have the telephone line checked for noise 
or low line levels.

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Try another telephone line (either a different telephone number in your house or 
a telephone line at a different location). If you can connect on this line, call your 
telephone service.

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Try connecting with the modem at a lower connection speed. If reducing the 
connect speed lets you connect, call your telephone service. The telephone line 
may be too noisy.

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The ISP may be having technical difficulties. Contact your ISP for technical support.

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See if the modem works with a different communications program. The problem 
may be with just one program.

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Review the troubleshooting information under 

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Current FCC regulations restrict actual data transfer rates over public telephone lines to 
53K. Other factors, such as line noise, telephone service provider equipment, or ISP 
limitations, may lower the speed even further.

If your computer has a v.90 modem, the speed at which you can upload (send) data is 
limited to 33.6K. If your computer has a v.92 modem, the speed at which you can upload 
data is limited to 48K. Your ISP may not support 48K uploads.

Current fax technology only supports a maximum send and receive rate of 14,400 bps.