DSU III AR 1202011L1

Deep Discount


Adtran DSU III AR standalone – 1202011L1
Adtran DSU III AR rackmount – 1200034L1 Adtran DSU III AR DC standalone – 1200270L1

The ADTRAN DSU III AR is a technologically advanced, high performance data service unit/channel service unit (DSU/CSU). 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. The synchronous primary channel rates supported are 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps. Asynchronous data rates supported are 2.4, 4.8, 9.6, 19.2, 38.4 and 57.6 kbps. Secondary channel data rates of 75, 150, 300, 600, 1200, and 2400 bps 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.


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.

The unit responds to standard loopback commands from the telephone company central office. In addition, the user has several built-in test capabilities. These include 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 standalone unit’s front panel keypad supports setup, selection of test modes, local and remote configuration, manual dialing, or automatic dialing from stored numbers.

The rackmount unit can be configured through the Smart 16/16e shelf controller card, from a local/remote VT 100 terminal or from an ADTRAN DATAMATE. The DSU III AR can also be configured using AT or V.25 bis commands. A DC version of the standalone unit is also available. The DSU III AR dc supports all the functionality of the DSU III AR, except secondary channel.

Ordering Information

DSU III AR standalone – 1202011L1
DSU III AR rackmount – 1200034L1
DSU III AR dc standalone – 1200270L1

Terminates 56/64k DDS link into a customer V.35 or DB25 EIA-232 DTE interface.

Synchronous loop and DTE rate from 2.4 Kbps to 64 Kbps
Asynchronous rate from 2.4 Kbps to 57.6 Kbps
Asynchronous secondary DTE port operates at 75 bps to 2400 bps, depending on primary channel rate
Automatic rate adaption
Supports 4-wire Switched 56 capability for dial up applications
Manual, DTR Dial, AT commands, V.25 bis, or stored number dialing
Derives timing from internal oscillator, the network, or an external DTE device
EIA-232 and V.35 DTE interfaces
AC power
DC version and Smart 16/16e rack mount version available

Refurbished DSU III units with a 1 year warranty.