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The TSU 100e is the modular, full-featured T1/FT1 multiplexer designed to support a wide range of end-user applications. Equipped with both a synchronous V.35 DTE interface, the TSU 100e supports applications combining high-speed data with additional end user applications. As interface requirements increase, the flexibility of the TSU 100e benefits the user with modularity through its expansion slot. The TSU 100e provides complete monitoring and control of the T1 network with embedded simple network management protocol (SNMP) provided through a SLIP interface. To support critical data applications, the built-in V.35 interface on the TSU 100e can be converted to provide dial backup functionality during T1 failure conditions. This feature is supported by the interface and is available using an optional V.35 "Y" cable. The TSU 100e also has a built-in 10BaseT Ethernet interface. Support for future growth, through the unit's single expansion slot, is a key feature of the TSU 100e. The ability to combine many types of plug-in and plug-on modules provides extensive combinations of voice and data interfaces. Several data modules are available for single and dual-port access to Frame Relay, DDS or Basic Rate ISDN services provided over T1 facilities. Voice modules are also easily integrated allowing access to analog voice circuits or additional PBX connections. As a fully functional T1 multiplexer, the TSU 100e supports all mixed-mode networking applications providing termination for circuits containing voice, data and video channels.