ADTRAN supplies innovative network access products that enable today's widespread digital telecommunications applications, including Internet access, telecommuting, corporate connectivity, distance learning, video-conferencing, and teleradiology. Used extensively in the networks of incumbent local exchange carriers, competitive local exchange carriers, interexchange carriers, Internet service providers, and private and public enterprises worldwide, ADTRAN products consistently reduce operating costs and improve network performance.??The Serial NIM can be set by the user to support a V.35 or X.21 (V.11) interface for synchronous operations up to 10 Mbps.