3Com 3C900B Installation And Operating Instructions Manual page 20

NOTE:
You cannot use the modem
and a phone at the same time if they
share the same telephone line.
11. Plug the microphone included with your
modem into the MIC jack on the modem.
12. To enhance the modem's full-duplex
speakerphone capabilities, plug a set of
powered external speakers (not included)
into the SPEAKER jack on the modem.
16
M I
ODEM NSTALLATION WITH
W 3.
INDOWS X
13. If you have your modem set to
COM1/IRQ4 or COM2/IRQ3, go to
"Software Installation and Testing" on page
33. If you have your modem configured to
any other setting, open Program Manager
and double-click the Main icon.