INFRALAN optical fiber cable U-DQ(ZN)BH OS2 4E (1x4) LSZH black G657A1 3000N

The INFRALAN optical fiber cable U-DQ(ZN)BH OS2 4E (1x4) LSZH black G657A1 3000N is a single-mode communication cable engineered for installations requiring long-distance signal transmission with enhanced bend resistance and low smoke/halogen emissions. It contains four optical fibers arranged as 1x4, uses G.657.A1 bend-insensitive fiber geometry, and is sheathed in a black low-smoke zero-halogen material. The cable has a rated tensile strength of 3000 N and an Eca reaction-to-fire classification, making it suitable for combined indoor and protected outdoor routing where safety and optical performance are priorities.

Advantages

This cable provides single-mode OS2 performance with improved bending tolerance afforded by G.657.A1 fibers, which reduces signal loss in tight-routing scenarios. The LSZH jacket lowers toxic and corrosive gas release in the event of a fire, improving safety in enclosed spaces. The 3000 N tensile rating supports reliable tensile loading during installation, while the 1x4 fiber construction simplifies fiber splitting or direct termination for small distribution runs. The black sheath offers UV and dirt masking for visible outdoor-exposed sections when used in protected ducts or conduits.

Suitable for

• Indoor backbone and riser installations in commercial and residential buildings
• Protected outdoor runs in ducts, conduits or between buildings
• Fiber-to-the-floor, fiber-to-the-desk, and small access aggregation points
• Installations requiring bend-insensitive fiber routing in limited spaces

When it may not be suitable

This cable is designed for single-mode OS2 applications and is not appropriate for multimode networks or short-distance premises networks that rely on multimode optics. It is also intended for protected outdoor use; it is not a fully armoured or direct-burial cable, so it should not be used where mechanical damage, prolonged water immersion, or unprotected outdoor exposure are likely without additional protection.

Key specifications

• Fiber type: single-mode, OS2
• Fiber count and arrangement: 4 fibers in 1x4 configuration
• Bend performance: G.657.A1 bend-insensitive fiber
• Sheath material: LSZH (low-smoke zero-halogen)
• Jacket color: black
• Reaction to fire class: Eca
• Tensile strength: 3000 N

How to use

Plan the route ensuring the cable remains within its minimum bend radius according to G.657.A1 guidance and avoid tight kinks. Use appropriate cable preparation tools to strip the LSZH jacket and buffer elements without nicking the fibers. For termination, follow standard single-mode splicing or connectorization procedures (fusion splicing or polished connectors) to maintain low loss. During installation, support the cable to avoid exceeding the 3000 N tensile rating and protect exposed sections with conduit or ducting when used outdoors. Perform optical power and continuity tests after installation to verify link performance.

What to consider before purchase

• Confirm that single-mode OS2 fiber is compatible with your transceivers and link budget requirements
• Assess whether the cable routing will require direct-burial, armouring, or additional environmental protection
• Verify required fiber count and connectorization or splicing plan for your installation
• Check local fire-safety codes to ensure Eca and LSZH meet building requirements

Usage recommendations

When routing this INFRALAN OS2 LSZH cable, maintain manufacturer-recommended bend radii, secure cable runs to prevent strain beyond 3000 N, and use fusion splicing for best single-mode loss performance. For outdoor-exposed segments, install the cable within ducts or conduits and avoid prolonged direct sunlight or standing water exposure.