Cabletron 4621CQ Fiber Optic Card Module Network Interface

Cabletron 4621CQ Fiber Optic Card Module Network Interface

The Cabletron 4621CQ is a fiber optic network interface card designed for use in Cabletron enterprise networking systems and switches. This module enables high-speed fiber optic connectivity for network backbone and long-distance link applications, supporting the transition from copper-based to fiber-based network infrastructure.

Specifications & What's Included

• Model: Cabletron 4621CQ
• Part Number: 4621CQ
• Type: Fiber Optic Network Interface Card
• Interface: Fiber Optic (single or dual port, exact port count not legible in available documentation)
• Connector Type: Fiber Optic
• Form Factor: Network Interface Card / Module
• Manufacturer: Cabletron Systems
• Country of Manufacture: United States

Applications

The Cabletron 4621CQ was widely deployed in enterprise data centers and campus networks during the 1990s and early 2000s, a period when fiber optic connectivity was rapidly expanding beyond core backbone use. This card type enabled system integrators and network administrators to upgrade Cabletron switching platforms with long-distance, high-capacity fiber links — critical for connecting distributed buildings, linking data centers, and supporting emerging bandwidth-intensive applications. Fiber optic modules like this represented a significant step forward from earlier copper-only systems, offering superior noise immunity, longer distances without signal degradation, and future-proofing for growing network demand. These cards remain useful in legacy system maintenance, retrofit projects, and environments where original equipment restoration or compatibility is required.