ZyXEL Communications P-660R-D Series - Manual (Page 189)

P-660R-D Series User’s Guide
Appendix H Splitters and Microfilters 1
A
P P E N D I X
H
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 119 Connecting a POTS Splitter
1 Connect the side labeled “Phone” or “TEL” 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.
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.