Cisco CX-FEIP2-2FX 73-1684-03 2-Port Fast Ethernet IP Module SC Fiber MII

Cisco CX-FEIP2-2FX 73-1684-03 2-Port Fast Ethernet IP Module SC Fiber MII

The Cisco CX-FEIP2-2FX is a dual-port Fast Ethernet Interface Processor (FEIP) module designed for the Cisco 7000 and 7500 series router platforms. It provides two 100BASE-FX fiber optic ports via SC connectors along with MII interface support, enabling high-speed Fast Ethernet uplinks over multimode fiber. The board carries part number 73-1684-03, hardware revision D0, as confirmed by the PCB label visible in photos.

Specifications & What's Included

• Manufacturer: Cisco
• Model: CX-FEIP2-2FX
• Part Number: 73-1684-03
• Hardware Revision: Rev D0
• Module Type: Fast Ethernet Interface Processor (FEIP)
• Number of Ports: 2
• Port Interface: 100BASE-FX via SC fiber connectors
• Additional Interface: MII (Media Independent Interface)
• Front Panel Indicators: MII, LINK, FIBER LEDs per port; RX/TX labeled
• High-density connector on opposite faceplate (visible in photos)
• On-board VLSI processor and memory ICs visible on PCB
• Compatible Platforms: Cisco 7000 series, Cisco 7500 series routers
• Included: Module only; no accessories, cables, or documentation

Applications

The Cisco 7000 and 7500 series routers were enterprise-class backbone and WAN aggregation routers widely deployed in the 1990s and early 2000s in large corporate networks, carrier infrastructure, and university campuses. The FEIP module family added Fast Ethernet switching intelligence directly to the router's interface processor bus, allowing the router to perform hardware-accelerated IP forwarding at 100 Mbps. The 2FX variant specifically uses fiber SC connectors for 100BASE-FX connections, making it suitable for building-to-building fiber runs and inter-switch links where copper 100BASE-TX was not practical. These modules are still sought after by organizations maintaining legacy Cisco 7000/7500 infrastructure and by network engineers and collectors preserving classic Cisco hardware from this era.