Cisco 1601 Hardware Installation Guide - Page 111

DSL Interface Cards Using POTS Splitters and Microfilters with an ADSL-over-POTS WIC (WIC-1ADSL) 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 To wall jack DATA VOICE 41199 To Cisco router To phone 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 wall jack WALL PHONE 41201 To phone OL-12846-01 15