100Mbps optical port gigabit optical module

The Cisco GLC-GE-100FX SFP module allows a Gigabit Ethernet port to carry a 100Mbps Fast Ethernet optical link over fiber.

Overview

A 100BASE-FX SFP is a 100Mbps Fast Ethernet optical transceiver designed for multimode fiber, typically operating at 1310nm and supporting distances up to 2 km . These modules are widely used in industrial, enterprise, and legacy networks where stable, interference-resistant fiber links are required. Standard 1000BASE-SX or 1000BASE-LX SFPs cannot operate at 100Mbps because their optical PHY is fixed at 1 Gbps .

Gigabit Port Compatibility

The GLC-GE-100FX module is specifically designed to interface with Gigabit Ethernet SFP ports. It presents a 1G SGMII signal to the host port while converting it to a 100BASE-FX optical signal on the fiber side . This allows modern Gigabit switches or routers to connect to legacy 100Mbps fiber links without requiring a dedicated Fast Ethernet port. The module supports full-duplex 100Mbps communication and maintains rate alignment between the host MAC and the SFP without renegotiating line speed.

Key Features

Data Rate: 100 Mbps Fast Ethernet over fiber
Fiber Type: Multimode fiber, 1310nm wavelength
Distance: Up to 2 km depending on fiber type and link budget
Interface: SFP (Small Form-factor Pluggable), hot-swappable
Host Port Compatibility: Gigabit Ethernet SFP cages using SGMII signaling
Applications: Legacy network integration, industrial Ethernet, surveillance networks, campus backbones

Deployment Considerations

Ensure the switch or router SFP cage supports SGMII signaling for 100Mbps operation.
Use LC duplex connectors for the fiber interface.
Verify fiber type and distance to match the 100BASE-FX specifications.
Ideal for connecting remote sites with existing 100Mbps fiber to modern Gigabit-only chassis.

Alternative Options

Other vendors, such as FS, also offer 100M SFP transceivers compatible with Gigabit ports, providing flexibility for data and telecommunication applications . These modules follow the same principle of converting a Gigabit host interface to a 100Mbps optical link.

Using a 100BASE-FX SFP for Gigabit ports is the most practical solution for maintaining legacy fiber infrastructure while upgrading network hardware to Gigabit Ethernet.

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