Adtran 1204011L1 – 1204011L1-R – LIKE NEW

SKU: 1105 Category:




Like New Available – In Stock


  • Supports DDS rates from 2.4 to 64 Kbps including 19.2 and 38.4 Kbps

  • 4-wire Switched 56 operation 

  • Embedded SNMP and Telnet

  • Control port provides SLIP/PPP access to SNMP or VT100 terminal configuration

  • Two ESP option slots

  • 10BaseT Ethernet SNMP access port available with ESP ethernet card

  • Automatic or manual dial backup with option modules

  • Time of day and weekend dial backup lockout options


The ADTRAN® DSU IV ESP™ is an all-rate data service/channel service unit (DSU/CSU) with an integral SNMP (simple network management protocol) agent and optional dial backup (DBU) capabilities. It provides an interface between digital data service (DDS) or 4-wire Switched 56 and the customer’s data terminal equipment (DTE). The DSU IV ESP provides access to traditional dedicated point- to-point, multi-point, or Frame Relay services.

The unit supports synchronous (2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 Kbps) and asynchronous (2.4, 4.8, 9.6, 19.2, 38.4, and 57.6 Kbps) data rates. Both EIA-232 and V.35 physical interfaces are provided for connection to the customer’s DTE equipment.

Embedded SNMP and Telnet are available through SLIP (serial line internet protocol) or PPP (point to point protocol) using the integrated control port or through an optional 10BaseT ethernet port when configured with the plug-in ESP ethernet card. Through the Management Information Base (MIB)-II standard and an ADTRAN-supplied enterprise MIB, the DSU IV ESP can be configured, monitored, and diagnosed using standard SNMP network management programs such as HP OpenView®, Netview®, and SunNet® Manager.

The Dial Backup (DBU) feature of the DSU IV ESP allows automatic or manual switched backup in the event of a dedicated line failure. The addition of DBU is accomplished through a family of plug-in ESP DBU cards. There are three versions of ESP DBU cards available for the DSU IV ESP: ISDN, 4-wire Switched 56, and V.34 analog (max. 33.6 Kbps). Upon recognition of a failure(s), the unit connects to the remote end using the switched network. The user can choose whether the unit automatically or manually reverts to the dedicated circuit when it is restored. Optional weekend and time of day DBU lockout options are provided. 

The unit responds to standard loopback commands from the telephone company central office. In addition, there are several built-in test capabilities. Complete control, configuration, and diagnosis are available through a 16-key keypad and a two-line by 16-character LCD display. A VT100 terminal configuration and control mode is also available through the control port. 



Model Name



ADTRAN 1204011L1 DSU IV ESP all-rate SNMP 4-W DDS/SW56 



Additional information

Weight 6.00 lbs
Dimensions 18.00 × 12.00 × 6.00 in


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