GLC-FE-100FX - Cisco 100Base-FX Fast Ethernet SFP Transceiver

Cisco GLC-FE-100FX — 100Base-FX Fast Ethernet SFP Transceiver

What it is

GLC-FE-100FX is a Cisco Small Form-Factor Pluggable (SFP) transceiver that provides 100 Mbps Fast Ethernet over fiber. It’s used in switches, routers, and industrial network gear that support SFP ports and need fiber connectivity for long-distance or electrically noisy environments.

Why buyers pick GLC-FE-100FX (plain English)

Fiber instead of copper: Use fiber for longer runs, better noise immunity, and electrically isolated links.

100 Mbps Fast Ethernet: Perfect for legacy networks, connecting older equipment, or low-bandwidth field devices.

Industry standard SFP: Plugs into any device with a standard SFP slot — easy to replace or upgrade.

Versatile deployment: Works well in industrial, enterprise, or campus networks with fiber backbones.

60-second spec box (GLC-FE-100FX)

Form factor

• SFP (Small Form-Factor Pluggable)

Speed / protocol

• 100 Mbps Fast Ethernet

Media type

• Fiber (100Base-FX)

Connector type

• Typically LC duplex (fiber)

Distance reach

• Depends on optics version (single-mode or multi-mode fiber)

Where it fits (and when to choose something else)

Perfect for:

• Fiber uplinks on older/legacy gear

• Environments needing long fiber runs (campus buildings, industrial sites)

• Devices with only SFP slots and no built-in fiber ports

Choose something else if:

• You need higher speed → Gigabit (1000Base-SX/LX) SFPs

• You want copper → use RJ-45 modules or ports

• You need very long reach → look for extended-reach fiber optics

TL;DR

GLC-FE-100FX is a Cisco 100Base-FX Fast Ethernet SFP fiber transceiver — a standard SFP module for 100 Mbps fiber connections in network devices with SFP slots.