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P-660R-Tx v2 Series User’s Guide
Appendix D Splitters and Microfilters 152
Appendix D
Splitters and Microfilters
This appendix tells you how to install a POTS splitter or a telephone microfilter.
Connecting a POTS Splitter
When you use the Full Rate (G.dmt) ADSL standard, you can use a POTS (Plain Old
Telephone Service) splitter to separate the telephone and ADSL signals. This allows
simultaneous Internet access and telephone service on the same line. A splitter also eliminates
the destructive interference conditions caused by telephone sets.
Install the POTS splitter at the point where the telephone line enters your residence, as shown
in the following figure.
Figure 95 Connecting a POTS Splitter
1 Connect the side labeled “Phone” to your telephone.
2 Connect the side labeled “Modem” to your ZyXEL Device.
3 Connect the side labeled “Line” to the telephone wall jack.
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.