ADTRAN DSU III - DSU

The ADTRAN Dual DSU III Module is one of several expansion modules for the TSU Multiplexer family of products. This module should be selected when the customer's data terminal equipment (DTE) needs to be connected to the Digital Data Service (DDS) or the Switched 56 network using a T1 line. The module installs in the expansion slot of the TSU and is subject to the unit's operation and control. A plug-on version of the Dual DSU III is also available for any of the other TSU expansion modules. Both the expansion module and the plug-on module provide two DTE interfaces each. Additional features of the Dual DSU III module include a DTE-to-service rate-matching feature for both dedicated and switched modes, and various anti-streaming time-out values used to disable streaming terminals on a multi-point circuit. Private networks and modem tail circuits can be accommodated through clocking/timing options. In Switched 56 mode, dialing options include manual dialing, redialing, and dialing of stored numbers. Dialing over the DTE interface is supported by use of an AT command set or the V.25bis in-band dialing protocol.