Indoor Multimode Optical Cable Fiber

Indoor multimode fiber optic cables are designed for high-speed data transmission within buildings, supporting OM1, OM2, OM3, and OM4 fiber types with plenum or riser-rated jackets for safe indoor installation.

Overview

Indoor multimode fiber optic cables are used for intra-building networks, including data centers, LANs, telecommunications rooms, and backbone connections. They are optimized for short to medium distances and high-bandwidth applications, typically supporting speeds from 10Gbps up to 100Gbps depending on the fiber type and wavelength. Fiber Types and Core SizesOM1: 62.

5/125 µm, suitable for legacy 1Gbps networks over short distances. OM2: 50/125 µm, supports 1–10Gbps over moderate distances. OM3: 50/125 µm, laser-optimized for 10Gbps up to 300 meters at 850nm, often used in plenum-rated indoor installations.

OM4: 50/125 µm, enhanced laser-optimized fiber for 10–40Gbps, supporting longer distances and higher bandwidth, ideal for modern data centers.

Construction and Ratings

Indoor multimode cables are available in tight-buffered or loose-tube constructions. Key features include: Plenum-rated (OFNP/OFNR): Suitable for air-handling spaces, low-smoke and flame-retardant. Riser-rated: For vertical runs between floors, less stringent than plenum.

Armored options: Steel or aluminum armor for rodent protection and mechanical durability. Strength members: Aramid yarn (Kevlar®) for tensile strength and durability during installation.

Strand Count and Jacket

Indoor multimode cables come in 2, 6, 12, 24, or more strands, allowing flexible deployment for patch panels and backbone connections. Jackets are typically PVC, LSZH, or FEP, with color coding (aqua for OM3/OM4) for easy identification.

Performance Characteristics

Wavelengths: 850nm and 1300nm for multimode operation. Bandwidth: OM3 typically 2000 MHz·km at 850nm; OM4 higher for extended reach. Bend-insensitive fibers: Maintain signal integrity in tight spaces and sharp bends.

Maximum attenuation: Around 3 dB/km at 850nm for OM3/OM4 fibers.

Applications

Data centers and high-performance computing networks.

Enterprise LA

Ns and campus backbone cabling. Fiber-to-the-desk or fiber-to-the-office deployments.

CCT

V, telecommunication, and multimedia networks.

Installation Considerations

Use pulling eyes or proper cable management to avoid exceeding minimum bend radius. Ensure plenum or riser rating compliance with local fire codes. Tight-buffered cables are easier for termination and patching, while loose-tube cables are better for longer runs or high fiber counts.

Indoor multimode fiber optic cables provide high-speed, reliable, and safe connectivity for modern building networks, with options tailored for plenum spaces, armored protection, and various strand counts to meet diverse installation needs.