The Dual Nx (pronounced “N-by”) 56/64 Module provides two synchronous V.35 DTE ports, each of which can operate at any rate that is a multiple of 56 or 64 kbps, up to 2.048 Mbps. The Dual Nx 56/64 Module can be installed in any option slot of the ATLAS 550 chassis. This manual will teach you about its features, installation, and function and operation of the device.