3.Locate the DSL pair of T1/R1 connectors on the customer premises side of the NID or punchdown block. Attach the wiring that will be connected to the DSL jack. In the following example, a NID is used without a POTS splitter. It includes an existing POTS line and a second pair installed for DSL access.
Telephone Network Interface Device (NID)
Customer Premises
Tip
T1
(Green)
Ring
R1
(Red)
Wiring to
DSL Jack
Existing POTS 
Wiring to
Telephone
Demarcation Point
DSL Pair |
POTS Pair |
DSL/POTS |
Access from |
Local Loop |
Ground |
6
