Installation guide

15
Configuring an ADSL WAN Interface Card on Cisco 1700 Series Routers
OL-3317-03
Using POTS Splitters and Microfilters
Telephone Company-Installed Splitter
This scenario is described below and illustrated in Figure 9.
• The telephone company has provisioned a single copper pair to be used by both the telephone
(POTS) service and the router with an ADSL 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 9 Telephone Company-Installed Splitter
Customer-Installed Splitter
This scenario is described below and illustrated in Figure 10.
• The telephone company has provisioned a single copper pair to be used by both the telephone
(POTS) service and the router with an ADSL card, so a POTS splitter must be installed.
• The splitter is installed by customer on the customer premises.
• Router and telephone are directly connected to the splitter, which is connected to the telephone line.
• 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