USRobotics 9003 - Manual (Page 8)

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Step 1. Connect Microfilters (If Necessary)
• If your package didn’t include microfilters, and your ISP didn’t provide
any: Skip to Step 2 of these instructions.
• If your installation requires microfilters: Install one on each telephone
device that shares the same phone line as the ADSL signal. (Tele-
phone devices include telephones, answering machines, and fax
machines.)
A microfilter is a small device that reduces interference between ADSL signals
and telephone signals. You only need a microfilter if the ADSL router and
telephone device share the same phone line. If you don’t use a microfilter, you
may experience background noise on your telephone during data transmission.
Also, telephone calls may interrupt data transmissions.
Connect Microfilters to Telephone Devices
To install the microfilter, plug the phone into the microfilter, and then plug the
microfilter into the telephone wall jack. Do not install a microfilter on the cable
that connects your router to the telephone jack unless your microfilter has a
connection for both the telephone and the DSL device.