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 56/64K Network Interface Module offers a WAN interface for a single 56K or 64K Digital Data Service (DDS) network. Miscellaneous Compliant Standards: FCC Class A certified , UL Interface Provided Connector Type: RJ-48C Interface: DDS Qty: 1 Type: Network Modem Digital Signaling Protocol: DDS Enclosure Type: Plug-in module Max Transfer Rate: 64 Kbps Transmission Mode: Full-duplex Type: Modem (digital) Service Support Details Full Contract Period: 5 years Support Details Type: Limited warranty Environmental Parameters Humidity Range Operating: 0 - 95% Max Operating Temperature: 131 °F Min Operating Temperature: 32 °F Header Compatibility: PC Manufacturer: ADTRAN Packaged Quantity: 1 Product Line: ADTRAN Dimensions & Weight Depth: 2.75 (in) , 2.8 in Width: 4.27 (in) , 4.3 in Service & Support Type: 5 years warranty