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.
SWITCHED DIAL BACKUP
NETWORK DATA RATES
Loop transmission parameters as defined in:
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
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