Adtarn DSU III DBU CSU/CSU


DSU III DBU

DEDICATED RACKMOUNT DSU/CSU WITH SWITCHED DIAL BACKUP

The ADTRAN DSU III DBU RM, a high-performance rackmount data channel service unit (DSU/CSU), provides an interface between the digital data service (DDS) and the customers data terminal equipment (DTE) while providing automatic switched dial backup (DBU) of the dedicated circuit. There are four DBU options: 4-wire Switched 56 (SW56), 2-wire SW56, V.34, and 1B+D ISDN. When the DSU III DBU is configured for dedicated service with switched DBU, the user selects options to qualify a dedicated line failure. Upon line failure recognition, the DSU initiates connection to the remote unit over the switched network. Upon restoral of the DDS circuit, the unit automatically or manually reverts to the restored DDS circuit.

The DSU III DBU supports synchronous operations at rates of 2.4, 4.8, 9.6, 19.2, 38.4, 56 and 64 kbps and asynchronous data rates of 2.4, 4.8, 9.6, 19.2, 38.4, and 57.6 kbps. The DTE interface can be selected as either EIA-232 or V.35 for all data rates. Another feature is DTE-to-service rate matching, for dedicated and switched DBU modes. This feature allows slower rate DTE equipment to communicate over a higher speed digital line. In the DBU mode, dialing is accomplished automatically (with stored numbers) or manually.

The DSU III DBU can be configured through the Smart 16/16e shelf controller card from a local/remote VT 100 terminal or from an ADTRAN DATAMATETM. The DSU III DBU can also be configured using AT or V.25 bis commands.

The unit responds to standard loopback commands from the telephone company central office. The front panel LEDs display test status, alarms, and errors during a test and DBU status. Automatic service rate detection and pair reversal detection aid installation.

Features


DSU III DBU APPLICATION EXAMPLE


Product Specifications

OPERATING MODES

  • Dedicated DDS
  • Dedicated DDS with automatic switched DBU

SWITCHED DIAL BACKUP

  • Automatic or manual
  • 4-wire SW56
  • 2-wire SW56
  • V.34
  • ISDN (1B+D)

NETWORK DATA RATES

  • Dedicated mode service rates: 2.4, 4.8, 9.6, 19.2, 38.4, 56 and 64 kbps
  • Dial backup: Switched 56 (56 kbps), V.34 (2.4/33.6 kbps), ISDN (56/64 kbps)

DTE RATES

  • DTE-to-loop rate matching in both dedicated and switched backup modes
  • Synchronous rates: 2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps
  • Asynchronous rates: 2.4, 4.8, 9.6, 19.2, and 57.6 kbps

DTE INTERFACE

  • Both EIA-232 and V.35 electrical and physical DTE interfaces

LINE REQUIREMENTS

Loop transmission parameters as defined in:

  • AT&T PUB 62310: Dedicated DDS
  • AT&T PUB 41468: SW56

Receiver sensitivity:

  • 45dB @ all rates

Line interface:

  • RJ-48S, 4-wire, full duplex

DIAGNOSTICS

Network

  • CSU and DSU loopbacks

User

  • Local DTE and loop, remote V.54

Test patterns

  • 2047, 511, DDS stress patterns 1-4

ENVIRONMENT

Operating Temperature

  • 0 to 50C, (32 to 122F)

Storage Temperature

  • 20 to 70C, (4 to 158F)

Relative Humidity

  • Up to 95%, non-condensing

PHYSICAL

Dimensions

  • 1." H, 6.75" W, 10.5" D

Weight

  • 1.5 lbs

Power

  • 8 watts
Product Includes: Two 8-pin to 8-pin modular cables and user manual
 
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

Ordering Information

 


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