The standard for outdoor 8-core optical cables is primarily defined by ANSI/ICEA S-87-640, which specifies construction, fiber types, environmental protection, and mechanical performance for outside plant optical fiber cables.

Key Standards and Compliance

Outdoor 8-core optical cables are designed according to ANSI/ICEA S-87-640, which covers optical fiber outside plant communications cables for telecommunications applications. This standard specifies requirements for fiber types, cable construction, mechanical strength, environmental resistance, and testing procedures, including UV, moisture, and fungus resistance (ICEA S-87-640-2016 and later revisions) . The standard is also aligned with GR-20-CORE, which provides additional guidance for telecommunications-grade fiber optic cables .

Cable Construction

• Fiber Count and Type: 8-core cables typically use multimode fibers with core diameters of 50 µm or 62.5 µm, compliant with OM3 or OM4 standards for high-performance data transmission .
• Loose Tube Design: Fibers are housed in loose tubes, often filled with water-blocking gel or water-swellable yarn to prevent moisture ingress .
• Strength Members: Central strength members are made from fiberglass reinforced plastic (FRP) or aramid yarn, providing tensile strength and anti-buckling support .
• Jacket Material: The outer jacket is typically UV-resistant polyethylene (PE) or anti-tracking (AT) material, ensuring protection against sunlight, moisture, and harsh weather conditions .
• Armored vs Non-Armored: Non-armored cables are all-dielectric with embedded strength elements, while armored cables include corrugated steel tape for mechanical protection, with the PE jacket applied over the armor .

Environmental and Mechanical Requirements

• Temperature Range: Designed to operate from -40°C to +70°C, suitable for diverse climates .
• Mechanical Tests: Includes tensile, crush, impact, and galloping tests (IEC 60794-1-21 Method E26) to ensure durability under outdoor conditions .
• Fungus and UV Resistance: Jackets must resist fungal growth and UV degradation to maintain long-term performance .
• No Fiber Splices in Cable: The standard specifies that fibers should be continuous without splices within the cable .

Fiber Identification and Ribbon Configuration

• Ribbon Fibers: Each ribbon may contain 12 or 24 fibers, with fibers color-coded according to TIA/EIA-598-A for easy identification .
• UV-Curable Inks: Fibers are colored with UV-curable inks, and ribbons are marked for identification .
• Parallel Fiber Alignment: Fibers within ribbons must remain parallel with no crossover along the cable length .

Summary

An outdoor 8-core optical cable built to ANSI/ICEA S-87-640 standards ensures mechanical robustness, environmental protection, and reliable optical performance. It incorporates loose tube construction, water-blocking features, strength members, UV-resistant jackets, and standardized fiber identification, making it suitable for telecommunications, networking, and data center applications in harsh outdoor environments .