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The Network Termination Unit-1 (NTU-1) provides an interface between your ISDN line and your premise ISDN equipment (S or T interface). NTU-1 supports point-to-point and multipoint configurations and distances up to 3.4 miles (5.4 km) over 26 AWG cable. An external AC power supply is included.This product works with: RJ-45 (8-Wire) Modular Cable, Straight-Pinned (EL08MS) Series 500 ISDN Routers Pure Networking 10/100 8-Port Ethernet Switch (LB8508A)