Cisco 1601 Hardware Installation Guide - Page 112

Using POTS Splitters and Microfilters with an ADSL-over-POTS WIC (WIC-1ADSL) DSL Interface Cards 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 To telco Telephone Company-Installed Splitter Splitter (NID) Actual wall of building 39196 Optional microfilters Cisco router 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. OL-12846-01 16