ZyXEL P-660HW-D1 v2 User Guide - Page 37
Telephone Microfilters
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Figure 4 Connecting a POTS Splitter Chapter 1 Introducing the ZyXEL Device 1 Connect the side labeled "Phone" to your telephone. 2 Connect the side labeled "Modem" or "DSL" to your ZyXEL Device. 3 Connect the side labeled "Line" to the telephone wall jack. 1.5.1.2 Telephone Microfilters Telephone voice transmissions take place in the lower frequency range, 0 - 4KHz, while ADSL transmissions take place in the higher bandwidth range, above 4KHz. A microfilter acts as a low-pass filter, for your telephone, to ensure that ADSL transmissions do not interfere with your telephone voice transmissions. The use of a telephone microfilter is optional. 1 Locate and disconnect each telephone. 2 Connect a cable from the wall jack to the "wall side" of the microfilter. 3 Connect the "phone side" of the microfilter to your telephone as shown in the following figure. 4 After you are done, make sure that your telephone works. If your telephone does not work, disconnect the microfilter and contact either your local telephone company or the provider of the microfilter. Figure 5 Connecting a Microfilter You can also use a Y-Connector with a microfilter in order to connect both your modem and a telephone to the same wall jack without using a POTS splitter. 1 Connect a phone cable from the wall jack to the single jack end of the Y-Connector. P-660HW-Dx v2 User's Guide 37