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The ADTRAN DSU 5600 provides cost-effective solutions for termination of 56 kbps DDS services. The unit is a very economical solution for single port point-to-point, multi-point or frame relay applications. Extensive use of VLSI technology provides a highly reliable feature-rich DSU. The enclosure for DSU 5600 is a small, attractive, slim-line package that is wall mountable, rack mountable or can sit on a desktop. The DSU 5600 provides both a physical and electrical EIA-232 DTE interface, which is mounted on the rear panel. The network interface operates at either 56 or 64 kbps. The DTE interface operates either at 56 or 64 kbps synchronous or 1.2 to 57.6 kbps asynchronous. Also located on the rear panel are option switches along with an RJ-48S network interface. The option switches allow the user to select the rate of operation, control lead options, remote digital loopback, and scrambler options.