For a computer room, indoor-rated multimode fiber (OM3 or OM4) with LSZH or OFNP jacket is typically recommended for high-speed, short-to-medium distance connections.

Fiber Type

• Multimode Fiber (MMF): Ideal for computer rooms and data centers where distances are generally under 300 meters. MMF supports high-speed connections (10 Gbps to 400 Gbps) and is cost-effective for short-range applications .
• Single-Mode Fiber (SMF): Used for longer distances or when future-proofing for very high-speed links over hundreds of meters to kilometers. SMF is less common for typical computer room setups unless connecting to other buildings or long-distance backbones .

Cable Grades

• OM3 and OM4: These multimode fiber grades are optimized for laser-based transceivers and high-bandwidth applications. OM4 offers higher bandwidth and longer reach than OM3, making it suitable for 40 Gbps or 100 Gbps links .
• OS1/OS2: Single-mode fiber grades for long-distance or backbone connections, typically outside the computer room or between buildings .

Jacket Type

• LSZH (Low Smoke Zero Halogen): Recommended for indoor computer rooms because it emits minimal smoke and no toxic halogen gases in case of fire, ensuring safety in enclosed spaces .
• OFNP (Plenum-rated): Required if the cable runs through air-handling spaces like ceilings or ducts, offering the highest fire resistance .
• Avoid OFNR (Riser-rated) in air-handling spaces, as it is not suitable for plenum areas and releases toxic gases when burned .

Connector Types

• Common connectors for computer room fiber include LC, SC, and ST. LC connectors are widely used in modern data centers due to their small form factor and high-density compatibility .
• Duplex cables are preferred for full-duplex communication, with one fiber for transmit and one for receive. Simplex cables are used for bidirectional transceivers or one-way links .

Installation Considerations

• Indoor-rated fiber should have protective coatings and strength members (e.g., aramid yarn) to prevent damage from bending or stretching .
• Avoid outdoor fiber with metal sheaths inside the computer room, as it can compromise electrical isolation and safety .
• Maintain proper bend radius to prevent signal loss or microfractures in the fiber .

Summary Recommendation

For a typical computer room setup:

• Cable Type: Multimode fiber (OM3 or OM4)
• Jacket: LSZH or OFNP depending on plenum requirements
• Connector: LC duplex for high-density patch panels
• Use Case: Short-to-medium distance connections between servers, switches, and patch panels This configuration ensures high-speed performance, safety compliance, and durability for indoor networking environments.