Compare Adtran DSU III AR (1200127L1#HS) to Adtran Quad FXS+ Voice Interface Card (1202300L1)

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. ??Configuration is available from the front panel of the TSU or by the optional T-Watch PRO management software. Monitoring, performance requests, and testing functions are initiated from the front panel. Each unit provides two separate all rate DSUs supporting synchronous and asynchronous data rates. The synchronous rates supported are 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps. Asynchronous data rates are provid... Less

To support analog voice applications in the TSU multiplexer, ADTRAN has several modules available that provide FXS, FXO and E&M interfaces. For flexibility, the analog voice modules come in a variety of formats. These modules provide a quick and simple upgrade path for TSU multiplexers requiring support for PBXs, KSUs, analog telephones, dial-up modem pools, fax machines and leased line modems.??To support station side connectivity for analog interfaces, the FXS+ modules offer several connectivity options. The Quad FXS+ module provides four, 2-wire voice-grade interfaces serving as the source of line-current and ringing voltage to a telephone or station interface. The FXS+ may serve as the station-side of a foreign exchange FXS/FXO application. It may be paired with another FXS+ to provide a hotline or private line automatic ringdown (PLAR) function to a remote location at the far end of the T-Span. When the FXS+ is used in the tandem mode, it can be set to accept phone service dir... Less