3Com 3C900B Installation And Operating Instructions Manual page 27

5. Holding the modem at each corner, with the
gold edge facing the slot, push the modem
down as gently as possible until it snaps into
the expansion slot. (NOTE: The following
diagram shows horizontally aligned
expansion slots. Some computers have
vertically aligned slots. The instructions
apply to both styles.)
You need to apply a little pressure to seat
the modem properly. Sometimes a gentle
back-and-forth motion helps fit the modem
all the way into the slot. If you feel
resistance, the modem may not be properly
lined up with the slot. Do not force it into
the slot. Remove the modem and try again.
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6. Once the modem is in the slot, fasten the
modem firmly into place using the screw
that you removed in step 4.
7. Replace the computer's cover and fasten it
with the screws you removed in step 3.
8. Locate the wall jack you plan to use for the
modem. If you have a phone plugged into
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