Four Types of Fiber Optic Patch Cords

The four common types of fiber optic patch cords are LC, SC, ST, and FC, each designed for specific network applications and connector standards.

1. LC (Lucent Connector) Patch Cords

LC patch cords feature small form-factor connectors with a 1.25mm ferrule, making them ideal for high-density data center applications and SFP optical modules. They provide low insertion loss and high return loss, and are commonly used in modern LANs, ToR switches, and high-speed intra-data center links .

2. SC (Subscriber Connector) Patch Cords

SC patch cords use 2.5mm ferrules and a push-pull design, which makes them easy to install and cost-effective. They are widely used in PON networks, converters, and telecom applications. SC connectors are reliable, durable, and suitable for both single-mode and multimode fibers .

3. ST (Straight Tip) Patch Cords

ST patch cords employ a bayonet-style connector with a 2.5mm ferrule. They are legacy connectors often found in labs, older campus networks, and some telecom setups. ST connectors are robust and provide secure connections but are less common in modern high-density environments .

4. FC (Ferrule Connector) Patch Cords

FC patch cords are screw-on connectors with a metal sleeve, primarily used in single-mode networks and telecommunications. They are highly reliable, dust-resistant, and suitable for long-distance or high-precision applications, though installation is slightly more time-consuming compared to LC or SC connectors .

Additional Notes

• Single-mode vs Multimode: Single-mode patch cords (yellow jacket) are used for long-distance transmission, while multimode cords (OM1/OM2 orange, OM3 aqua, OM4 violet, OM5 lime green) are suited for short-distance, high-speed data center links .
• Specialty Cords: Armored, bend-insensitive, and MPO/MTP patch cords are available for harsh environments, tight bends, or high-fiber-count parallel optics .
• Cable Structure: Patch cords can be simplex (single fiber) or duplex (two fibers), depending on the network requirements . Choosing the right fiber optic patch cord depends on network type, distance, connector compatibility, and environmental conditions, ensuring optimal performance and reliability.