Cisco 1601 - Router - EN Hardware Installation Manual page 112

Using POTS Splitters and Microfilters with an ADSL-over-POTS WIC (WIC-1ADSL)
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
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Figure 76
To telco
Customer-Installed Splitter
This scenario is described below and illustrated in
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OL-12846-01
16
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.
Telephone Company-Installed Splitter
Splitter (NID)
Cisco router
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.
Figure 76.
Actual wall of building
Optional
microfilters
Figure 77.
DSL Interface Cards