ZyXEL Communications 650 Series User Manual

Prestige 650 Series User’s Guide 

Splitters and Microfilters 

 

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This appendix tells you how to install a POTS splitter or a telephone microfilter. 

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. 

 

Step 1.  Connect the side labeled “Phone” to your telephone. 

Step 2.  Connect the side labeled “Modem” to your Prestige. 

Step 3.  Connect the side labeled “Line” to the telephone wall jack. 

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.  

Step 1.  Connect a phone cable from the wall jack to the single jack end of the Y- Connector.