The NT-300 is your stand-alone ISDN network termination (NT1) unit which provides the 2B1Q basic rate interface needed between the ISDN network line and the subscriber terminal equipment. You get two 64 Kbps B-channels for simultaneous voice/data transmission and one 16 Kbps D-channel for network signal transmission. Ideal for remote branch offices and home offices. The NT-300 unit also features an internal power supply enclosed in a compact and lightweight housing suitable for desktop or wall-mount installation. 104mm (W) x 159mm (D) x 60mm (H)