Zoom ADSL X4 - Manual (Page 11)

Chapter 1: Installation Instructions 11
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We HIGHLY RECOMMEND that you install a filter on
EVERY phone and fax machine that is sharing the ADSL
phone line. (Do not plug a filter between the wall jack and the
X4.) Phone filters block the ADSL frequencies so that
someone making a normal phone call will not hear modem
noise on the line. They also keep phone conversations from
interfering with ADSL performance.
You may have received ADSL phone filters with your X4. If
you did not, or if you need more filters, they are available at
most retail stores that carry consumer electronics.
For each filter, plug the phone or fax machine’s cord into the
filter’s PHONE end and plug the filter’s LINE end into the
wall jack.
Congratulations! You have installed the hardware. Now, continue
with the next section, Configuring Your Web Browser.