Compare Adtran TSU 120e™ Multiplexer (1202129L1) to Adtran ISU™ 512 Multiplexer (1202086L3)

The TSU 120e is a modular, full-featured T1-FT1 DSU/CSU designed to support a wide range of end-user applications.??Equipped with both a synchronous V.35 DTE interface and a DSX-1 PBX port, the TSU 120e supports applications combining digital voice and high speed data. As interface requirements increase, the flexibility of the TSU 120e benefits the user with modularity through its expansion slot. The TSU 120e provides complete monitoring and control of the T1 network with embedded Simple Network Management Protocol provided through both a SLIP and a 10BaseT Ethernet interface. To support critical data applications, the built-in V.35 interface on the TSU 120e 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. Support for future growth, through the unit's single expansion slot, is a key feature of the TSU 120e. The ability to combine many types of plug-in and... Less

The ADTRAN ISU 512 is a standalone ISDN Service Unit that connects data terminal equipment (DTE) to the ISDN network. The ISU 512 is specifically designed as a low-cost solution for applications such as video-conferencing, T1 backup, LAN/WAN connectivity, and high-speed file transfer.? ?The ISU 512 is designed as a cost-effective inverse multiplexer for 384 kbps videoconferencing. Some video-conferencing products operate in a dual port mode. The ISU 512 is designed to operate in a dual port mode making it backward compatible with videoconferencing systems utilizing two Switched 56 DSUs or a dual port ISDN terminal adapter. The ISU 512 connects directly to the ISDN network using up to four Basic Rate ISDN (BRI) lines. By terminating four BRI circuits, the ISU 512 can create an aggregate bandwidth of up to 512 kbps which can be used to backup a T1 circuit. Since ISDN is a switched digital service, bandwidth can be established and utilized on an as needed basis. Therefore, the ISU 512... Less