DETAILS: The ADTRAN DSU III AR is a technologically advanced, high performance data service unit/channel service unit. This unit provides a reliable interface between the digital data service (DDS) or 4-wire Switched 56 (SW56) network and the customer"s data terminal equipment (DTE). The unit is an all-rate DSU/CSU supporting synchronous and asynchronous data rates on the primary channel and asynchronous data rates on the secondary channel.Additional features of the DSU III AR include a DTE-to-service rate matching feature for both dedicated and switched modes, as well as various anti-streaming time-out values, to disable streaming terminals on a multi-point circuit. Private networks and modem tail circuits are accommodated through clocking/timing options. Product Description ADTRAN DSU III AR - DSU/CSU Device Type: DSU/CSU Enclosure Type: External Dimensions (WxDxH): 8.7 in x 10.2 in x 2.2 in Weight: 2.9 lbs Localization: English / United States Max Transfer Rate: 64 Kbps Protocols & Specifications: ITU V.25bis Power: AC 110 V ? 10% ( 60 Hz ) Manufacturer Warranty: 5 years warranty ALTERNATE ITEM #: 1202011L1 UPC: 0607565000393