Battery charger ( external ) memory backup battery

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, independent carriers, competitive service providers, interexchange carriers, Internet service providers, and private and public enterprises worldwide, ADTRAN products consistently reduce operating costs and improve network performance.