DSL Interface Cards
Using POTS Splitters and Microfilters with an ADSL-over-POTS WIC (WIC-1ADSL)
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OL-12846-01
Common Splitter and Microfilter Configurations
This section describes the most common scenarios for using splitters and microfilters. The scenarios are
listed from most common to least common.
Telephone Company-Installed Splitter
This scenario is described below and illustrated in Figure 76.
• The telephone company has provisioned a single copper pair to be used by both the telephone
(POTS) service and the router with a DSL interface card, so a POTS splitter must be installed.
• The splitter is installed by the telephone company on the customer premises. This type of splitter is
also referred to as a network interface device (NID).
• The router and telephone are on separate lines (twisted pair) to the splitter.
• The router and telephone share the same telephone line (twisted pair) to the telephone company.
Figure 76 Telephone Company-Installed Splitter
Customer-Installed Splitter
This scenario is described below and illustrated in Figure 77.
• The telephone company has provisioned a single copper pair to be used by both the telephone
(POTS) service and the router with a DSL interface card, so a POTS splitter must be installed.
• The splitter is installed by the customer on the customer premises.
• The router and telephone are directly connected to the splitter, which is connected to the telephone
line.
• The router and telephone share the same telephone line (twisted pair) to the telephone company.
• For optional telephones connected through the splitter, microfilters are optional. They should be
installed only if they improve telephone call quality.
• For telephones connected directly to the telephone line, microfilters are required.
Splitter (NID)
To telco
Cisco router
Optional
microfilters
39196
Actual wall of building
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