Call a Specialist Today! 833-335-0426

Full Featured T1/FT1 DSU/CSU with SNMP


ADTRAN Products
TSU Series
TSU ESP Chassis
Get a Quote!

Click here to jump to more pricing!


The ADTRAN TSU ESP™ is a full-featured T1-FT1 Data Service Unit/Channel Service Unit (DSU/CSU) with an integral SNMP Agent and optional, modular Dial Backup (DBU) capabilities. It provides an interface between T1 or Fractional T1 service and the customer's Data Terminal Equipment (DTE). The TSU ESP provides access to traditional dedicated point-to-point T1circuits as well as Frame Relay services.

The TSU ESP supports synchronous data rates from 56 kbps to 1.536 Mbps at Nx56 or Nx64 kbps. A single V.35 physical interface provides a connection to the end user's DTE.

Embedded SNMP and Telnet are available through the integral SLIP or an optional 10Base-T 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 TSU ESP can be configured and monitored using standard SNMP network management programs such as HP OpenView, Netview and SunNet Manager.

The Dial Backup capability of the TSU ESP allows for automatic switched backup in the event of a dedicated T1 line failure. The Dial Backup is accomplished through a family of plug-in ESP DBU cards. Several versions of ESP DBU cards are available including 4-wire Switched 56, 2B+D ISDN, and External DCE. When a failure condition occurs on the T1/FT1, the DBU card uses the switched network (ISDN, 4-wire Switched 56) or DTR dialing (External DCE) to initiate a call to the remote end. 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 Dial Backup lockout options are provided in the TSU ESP DBU option menu.

The TSU ESP 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 and 511 BERT test patterns. Complete unit control and configuration are available through a 16-key pad and a two-line, 16 character LCD display. A VT100 terminal configuration and control mode is also available through the control port. Optional Windows-based PC management is available through the T-Watch PRO™ software package. Flash download capability is implemented for installation of new features and future enhancements.


  • Single V.35 DTE interface
  • Nx56 or Nx64 operation
  • Embedded SNMP and Telnet
  • Control port provides SLIP access to SNMP or VT100 terminal configuration
  • Two ESP option slots
  • 10Base-T Ethernet port available with ESP Ethernet Card
  • Optional ESP DBU cards include 4-wire SW56, Single BRI and External DCE
  • Automatic or manual dial backup
  • Time of Day and Weekend dial backup lockout options
  • Support for T-Watch PRO software for optional PC-based configuration
  • Industry-leading five-year North American warranty


TSU ESP Specifications
Network Interface Line Rate: T1/FT1 (1.544 Mbps)
Physical Interface RJ-48C: 8-pin modular
Framing SF/ESF
ESF Format
  • AT&T 54016
  • ANSI T1.403
Line Code AMI/B8ZS
Input Signal 0 to –36dB
DSO Assignment
  • Contiguous
  • Alternating
T1 Transmit Timing
  • Network Loop Timed
  • Internal
  • DTE
DTE Interface Bit Rate: 56 kbps to 1.536 Mbps, Nx56 or Nx64 kbps (N=1 to 24)
Electrical CCITT V.35
Mechanical V.35 (Winchester Type 34 pin)
SNMP & Telnet Integrated SLIP Port: Physical Connector RJ-48S
ESP Slots
  • Optional 10Base-T interface with ESP Ethernet module
  • Optional dial backup with ESP Dial Backup modules
Performance Monitor Performance Data: BPVs/CRCs, ES, SES, UAS, % AS, % EFSEC, Alarms, Errors
Reports NI information stored for last 24 hours in 15 minute increments
PRMS ANSI performance report messages (user selectable)
  • Local: Payload/line loopback, DTE loopback
  • Remote: Payload/line loopback, V.54 (DTE) loopback
  • CSU loopback
Built-In Test Patterns
  • 511 (active DS0s) with error insert available
  • All 1's (all DS0s)
  • All 0's (all DS0s)
Operating Temperature 0° to 50°C, (32° to 122°F)
Storage Temperature –20° to 70°C, (–4° to 158°F)
Relative Humidity Up to 95%, non-condensing
Dimensions 2.4" H x 8" W x 10.4" D
Weight 4 lbs.
Power 115 vAC, 60 Hz, 5 W
Agency Approvals FCC part 15, Class A, FCC Part 68, Industry Canada CS03, UL, CUL
Product Includes Two 8-pin to 8-pin modular cables, modular to female DB-9 adapter, and user manual


TSU ESP Deployment


Download the ADTRAN TSU ESP Datasheet (PDF).


ADTRAN Products
TSU Series
TSU ESP Chassis
Get a Quote!