US Robotics Sportster Operating Instructions Manual page 26

3. Find the jumper shunts (small black plastic
pieces) on the COM port and IRQ jumper
pins on your modem. They should be in
roughly the area indicated in the following
illustration.
When doing a "Plug and Play" installation,
the jumper shunts should be placed so that
they are hanging from single jumper pins
rather than on pairs of pins. Your modem's
jumper shunts should already be in this Plug
and Play configuration. If they are not,
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NTERNAL ODEM NSTALLATION WITH
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INDOWS
move them so they are hanging as in the
following diagram.
NOTE:
If you need to move the
shunts, grasp them with a tweezers or a
needle-nosed pliers. DO NOT grasp too
firmly, however, or you may crush the
shunts. If a shunt seems stuck, try
gently rocking it back and forth as you
lift.