DSL Interface Cards
Using POTS Splitters and Microfilters with an ADSL-over-POTS WIC (WIC-1ADSL)
15
OL-12846-01
Figure 74 is an example of a type of POTS splitter that is installed at the customer premises by the
customer. Other types of POTS splitters are installed by the telephone company on an exterior wall of
the customer premises.
Figure 74 POTS Splitters
Microfilters
Microfilters are installed on telephones to improve voice-call quality when voice and data equipment are
using the same telephone line (twisted pair). You should use microfilters only when the two following
conditions exist:
• The documentation for the telephone you are using with the router states that microfilters should be
used with the phone.
• Poor telephone call quality can be resolved by installing a microfilter on the phone line.
Figure 75 shows one type of microfilter.
Figure 75 Microfilter
To
Cisco router
To wall jack
41199
To phone
DATA
VOICE
To wall jack
To phone
41201
WALL
PHONE
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