Tellabs 814420GD 4W-4W DST Dual Write Selector Trunk

Tellabs 814420GD 4W-4W DST Dual Write Selector Trunk

The Tellabs 814420GD is a dual write selector trunk module (DST) configured for 4W-4W operation, a key component in legacy telecommunications switching and multiplexing systems. This trunk module handles selective call routing and dual-write operations within Tellabs switching fabrics and network architectures, particularly in mid-range telephone exchange and private branch exchange (PBX) environments.

Specifications & What's Included

• Manufacturer: Tellabs, Inc.
• Model: 814420GD
• Configuration: Dual Write Selector Trunk (4W-4W DST)
• Component Type: Switching trunk module
• Application: Telecommunications switching and call routing
• Form Factor: Plug-in trunk module (compatible with Tellabs switching platforms)
• Condition: Used, pulled from operational service

Applications

The 814420GD selector trunk module was designed for use in Tellabs digital switching systems and communications platforms that required sophisticated trunk selection and call routing capabilities. These modules were integral to telephone exchange operations, PBX systems, and telecommunications network infrastructure from the 1980s through early 2000s. The dual-write selector trunk (DST) configuration enabled flexible call routing paths and improved traffic handling in complex switching matrices. Today, these modules are sought by telecommunications historians, legacy system maintainers, and collectors of classic switching equipment. Facilities still operating Tellabs-based legacy systems may also require replacement or spare modules for continuity of service.