Use duplex LC fiber optic patch cables for most modern switches, or MPO/MTP cables for high-speed parallel connections.

Recommended Cable Types

For standard network switches with SFP or SFP+ transceivers, duplex LC fiber optic cables are the most common choice. These cables have two strands—one for transmitting and one for receiving—and are compatible with most 1G, 10G, and 25G SFP modules . When connecting the cable, ensure the transmit (TX) port on one switch connects to the receive (RX) port on the other switch, maintaining proper polarity .

For high-speed connections such as 40G, 100G, or 400G, MPO/MTP multi-fiber connectors are used. These connectors support parallel optics, allowing multiple fibers to transmit simultaneously, which is essential for high-bandwidth applications . MPO/MTP cables are typically used for spine-leaf interconnects or data center backbone links .

Fiber Mode Selection

• Single-mode fiber (SMF): Best for long-distance connections, typically beyond 500 meters, and used with single-mode SFP modules .
• Multimode fiber (MMF): Suitable for short-distance intra-data center links, usually up to 500 meters, and compatible with OM3, OM4, or OM5 fiber types .

Connector and Jacket Considerations

• Connector type: Match the transceiver port (LC for duplex SFP/SFP+, MPO/MTP for parallel QSFP or 400G modules), .
• Jacket type: Choose according to installation environment—PVC for basic indoor use, OFNP (plenum) for air ducts, OFNR (riser) for vertical shafts, or LSZH for low-smoke, high-safety areas .
• Cable length: Avoid excess slack to reduce signal loss and maintain proper cable management .

Summary Recommendations

• Server to Top-of-Rack (ToR) switch: LC duplex patch cable, multimode for short runs, single-mode for longer runs .
• Leaf to Spine or high-speed interconnects: MPO/MTP trunk cables with appropriate breakout patch cords .
• Future-proofing for 400G/800G clusters: Consider MDC/CS duplex or MPO/MTP parallel patching .

By selecting the correct fiber type, connector, and jacket, you ensure low insertion loss, high reliability, and compatibility with your switch's transceivers, supporting optimal network performance .