Description
Lucent AT&T 517B21 008 MLX Module 107798183 8-Port Digital Telephone PBX Card
The Lucent AT&T 517B21 is an 008 MLX line module that provides 8 MLX (digital) telephone ports for use in Lucent Merlin Magix and Merlin Legend PBX systems. It installs directly into the PBX cabinet backplane and adds digital telephone extension capacity. The module is labeled 108 MLX / 8 MLX (Digital) Telephones and carries part number 107798183.
Specifications & What's Included
- Model: 517B21
- Part Number: 107798183
- Module designation: 008 MLX
- Number of digital telephone ports: 8
- Port type: MLX digital telephone jacks (RJ-type modular), numbered 57–64
- Backplane interface: gold-pin edge connector for direct PBX cabinet installation
- Form factor: plug-in line module / card
- Compatible systems: Lucent Merlin Magix, Merlin Legend, and related AT&T/Avaya PBX platforms
- Module only — no cables or accessories included
Applications
The 008 MLX module is a core expansion card for the Lucent Merlin Magix and Merlin Legend family of small-to-mid-size business PBX systems — platforms that were widely deployed from the mid-1990s through the 2000s by AT&T Business Communications Systems and later Lucent Technologies and Avaya. These systems use plug-in line and extension modules to configure the number and type of telephone ports available; the 008 MLX card specifically adds 8 MLX-protocol digital extension ports, which support Lucent MLX-series digital desk phones with features like display, programmable buttons, and multiple line appearances. Merlin Magix and Merlin Legend systems remain in active service at many small businesses, schools, and organizations that have not yet migrated to VoIP, making replacement and expansion modules like the 517B21 a practical maintenance and upgrade component. This module is also sought by technicians and system integrators who refurbish or maintain legacy Lucent / Avaya telephony installations.
This Lucent AT&T 517B21 008 MLX Digital Telephone Module has been inspected and is in good used condition. It was pulled from a working PBX environment where it was actively in use. The housing shows minor surface scuffing and light discoloration consistent with normal age and rack use, but there is no cracking or damage to the module body or ports. All 8 MLX port jacks appear clean and intact. The backplane edge connector is present and in good condition. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Lucent Technologies |
Model: |
517B21 |
MPN: |
517B21 |
Secondary Model: |
107798183 |
SKU: |
49980 |
Type: |
Digital Telephone Line Module |
Number of Ports: |
8 |
Port Type: |
MLX Digital Telephone |
Connector Type: |
RJ-type modular jacks (8 ports) |
Form Factor: |
Card/Module |
Compatible With: |
Merlin Magix, Merlin Legend PBX systems |
Compatible With 2: |
Lucent / AT&T DEFINITY systems |
Condition: |
Used – Pulled from Working Environment |
Seller Notes: |
Module only; no cables or accessories included. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Lucent AT&T 517B21 008 MLX Digital Telephone Module in good used condition. Pulled from a working PBX environment where it was actively in use. Minor surface scuffing from normal use. All 8 MLX ports and backplane connector intact. |
