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The ADTRAN DSU III AR is a technologically advanced, high performance DSU/CSU that provides a reliable interface between the digital data service (DDS) or 4-wire Switched 56 (SW56) network and your 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. The synchronous primary channel rates supported are 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64kbps. Asynchronous data rates supported are 2.4, 4.8, 9.6, 19.2, 38.4 and 57.6kbps. Secondary channel data rates of 75, 150, 300, 600, 1200, and 2400bps are offered depending upon the primary channel rate.
The DTE interface can be selected as either EIA-232 or V.35 for all data rates. The secondary channel interface is EIA-232 and is accessed through a separate connector. The unit responds to standard loopback commands from the telephone company central office. In addition, you have several built-in test capabilities, including V.54 remote loopback, 2047 and 511 BERT test patterns, and four DDS stress patterns (results of which are displayed on a two-line by 16-character LCD display and seven LEDs). The unit's front panel keypad supports setup, selection of test modes, local and remote configuration, manual dialing, or automatic dialing from stored numbers.
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.
In the 4-wire SW56 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.25 bis in-band dialing protocol.