Description
Lucent ATT TN726 8-Port Data Line Card Avaya DEFINITY G3 PBX Telephone System
The Lucent ATT TN726 is an 8-port Data Line circuit pack designed for use in Avaya and AT&T DEFINITY G3 PBX telephone systems. It provides data connectivity for terminal and modem connections within the DEFINITY switching platform, allowing data devices to interface directly with the PBX cabinet through standard digital line ports.
Specifications & What's Included
- Model: TN726 Data Line Circuit Pack
- Manufacturer: Lucent Technologies / AT&T
- Number of Data Ports: 8
- Form Factor: Standard DEFINITY circuit pack (card/module)
- Label: "DATA LINE / TN726" on front faceplate tab
- PCB: Green multi-layer board populated with multiple ICs, yellow capacitors, and passive components
- Edge Connector: Standard DEFINITY cabinet backplane connector
- Compatible Systems: Avaya DEFINITY G3, DEFINITY Enterprise CS, AT&T DEFINITY G3 PBX
- Included: Card only — no cables or accessories
Applications
The TN726 Data Line circuit pack is used in AT&T and Lucent DEFINITY G3 PBX systems to support data terminal connections — enabling modems, data modules, and serial data devices to communicate through the PBX fabric. DEFINITY G3 was a widely deployed enterprise telephony platform from the late 1980s through the 2000s, used in large corporate, government, and institutional environments. Circuit packs like the TN726 slot into the DEFINITY port network carrier cabinet and are the standard method for expanding or replacing port capacity. These cards remain in demand as replacement and spare parts for organizations still running DEFINITY-based infrastructure, as well as for system integrators maintaining or refurbishing legacy Avaya/Lucent PBX installations.
This Lucent ATT TN726 8-Port Data Line Card has been inspected and appears to be in good used condition. The PCB is clean with no visible damage, cracked components, or burn marks. The faceplate and card tab are intact. This card was pulled from a working PBX environment where it was previously in service. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Lucent |
Model: |
TN726 |
MPN: |
TN726 |
Type: |
Data Line Circuit Pack / Board |
SKU: |
12103 |
Number of Ports: |
8 |
Compatible With: |
Avaya DEFINITY G3, DEFINITY Enterprise CS |
Compatible With 2: |
AT&T DEFINITY G3 PBX systems |
Form Factor: |
Card / Circuit Pack |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Card only — no cables or accessories included. |
Condition Notes: |
This Lucent ATT TN726 8-Port Data Line Card has been inspected and is in good used condition. The PCB is clean with no visible damage. Pulled from a working PBX environment. Please contact us with any questions. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |