Compare Adtran DSU III AR DC (1200270L1) to Adtran Quad FXS+ Voice Interface Card (1202300L1)

The ADTRAN DSU III AR is a technologically advanced, high performance data service unit/channel service unit. This unit provides a reliable interface between the digital data service (DDS) or 4-wire Switched 56 (SW56) network and the customer's data terminal equipment (DTE). The unit is an all-rate DSU/CSU supporting synchronous and asynchronous data rates on the primary channel and asynchronous data rates on the secondary channel. ??Additional features of the DSU III AR include a DTE-to-service rate matching feature for both dedicated and switched modes, as well as various anti-streaming time-out values, to disable streaming terminals on a multi-point circuit. Private networks and modem tail circuits are accommodated through clocking/timing options. 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