MicroNet Technology SP3367A - Manual (Page 15)

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2.5 Splitter Configuration
ADSL splitter builds-on a micro-filter it stops the ADSL signal interfering
with the voice part of your phone line. The graph hereunder shows the
frequency range that your phone (POTS) and ADSL occupy. Use ADSL
splitter to separate the bands for POTS and ADSL and get better
communication quality.
POTS Splitter Configuration (ADSL over POTS)
A POTS splitter separates data signals from voice signals on your
telephone line. The POTS splitter works by running a separate data line
from the voice line, so that the ADSL router has a cable dedicated for data
transmission. Figure 2-5.1 and 2-5.2 shows how to connect all cables to
the Router.