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Designed to handle the growth and increasing complexity of digital networks, the 3500 series data service unit (DSU) combines a wide array of features into a single, economical and highly functional unit. The 3500 series DSU enables the user to make maximum use of digital data services. Based on a field-proven Bell Laboratories digital data pump, the 3500 series DSU provides a cost-effective solution for a broad range of operating environments. Because the 3500 series DSU can operate as a limited distance modem (LDM) in a point-to-point application, it is particularly ideal for campus environments that require a single unit to operate over a wide range of speeds.Depending on the speed and wire gauge, the unit can operate at distances of over 16 miles. The 3500 series DSU supports traditional point-to-point and multipoint configurations. It is line-compatible with all of Paradyne's DSU products, and is also diagnostically compatible with the COMSPHERE 3600 series and the DATAPHONE II 2500 and 2600 series DSUs. This compatibility with a wide range of digital products provides investment protection while assuring a smooth migration path.The 3511 carrier card mounts in the high-density COMSPHERE 3000 series carrier and is ideal for central site applications.