A 2-core indoor drop fiber optic cable is a single-mode, bend-insensitive cable with LSZH sheath and FRP or steel strength members, designed for FTTH and indoor installations.

Cable Structure and Materials

A typical 2-core indoor drop cable consists of two optical fibers positioned at the center of the cable, usually single-mode G.657A1 or G.657A2, which are bend-insensitive and suitable for tight-radius installations . The fibers are surrounded by strength members, which can be Fiber Reinforced Plastic (FRP) rods or steel wires, placed on either side of the fiber unit to provide tensile strength and crush resistance . The entire assembly is enclosed in a Low Smoke Zero Halogen (LSZH) jacket, which is flame-retardant and safe for indoor use .

Key Features

• Bend Insensitivity: G.657A fibers allow small bending radii (as low as 7.5 mm), reducing the risk of attenuation or fiber breakage in tight spaces .
• Strength Members: FRP rods are non-metallic, providing lightning protection and anti-electromagnetic interference, while steel wires offer higher crush and tensile strength .
• Sheath Material: LSZH jackets minimize smoke and toxic gas emission in case of fire, making them suitable for indoor environments .
• Cable Form Factor: Many indoor drop cables are flat or butterfly-shaped, facilitating installation in conduits, along walls, or under skirting boards .

Applications

• FTTH Installations: Direct connection to subscriber premises, supporting high-bandwidth data transmission .
• Indoor Horizontal and Riser Cabling: Suitable for local area networks, inter-building links, and indoor distribution .
• Flexible Routing: Can be stapled, clipped, or run through conduits without special guides due to low friction and flexible design .

Standards and Compliance

These cables typically comply with ITU-T G.657A, IEC 60793-2-50, IEC 60794-1, ROHS, UL, and CE standards, ensuring quality, safety, and interoperability .

Summary

A 2-core indoor drop fiber optic cable is ideal for indoor FTTH and LAN applications, offering high flexibility, bend-insensitive single-mode fibers, LSZH safety sheathing, and robust strength members. The choice between FRP and steel strength members depends on the required tensile and crush resistance, while the flat or butterfly design simplifies installation in tight indoor spaces .