Apple Macintosh PowerBook Internal Modem/Ethernet - Manual (Page 9)

Make sure the modem is communicating with the telephone line.
Follow these steps to test the telephone connection.
1 Open the Monitors & Sound control panel and check that the volume is set above the
lowest mark.
By increasing the volume, you can verify both that there is a dial tone
when you try to open communications and that the modem can dial
telephone numbers.
2 Open your communications program and enter terminal mode (if the program offers
this feature).
Terminal mode sends the characters you type on the keyboard to your modem
and displays them on the screen.
Many communications programs, such as ClarisWorks ® , provide “terminal
emulation.” You can use this capability to talk directly to your modem by first
specifying the modem port, then opening a connection to that port. With the
connection open, you can try dialing your own telephone number by typing
“ATD555-1212” (where the numbers are replaced by your phone number). If
you hear a busy signal, you are connected properly.
3 Try dialing your own telephone number.
If you hear a busy signal, you are properly connected.
4 If you do not hear a dial tone when you try to dial a number, test your telephone line by
connecting a working telephone and cable to the line.
Plug the telephone into the wall jack to verify the dial tone. If there is none,
the telephone line is the source of the problem. If you hear a dial tone on the
telephone, the line may be a digital line, in which case the modem will not
work.
5 If you hear a dial tone on your telephone but not through your modem, test your
modem’s telephone cable by connecting it to the wall jack and to the telephone.
If there is no dial tone, the telephone cable is the source of the problem.
Return it to your service provider for replacement.
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