Steel Wire Armored (SWA) fiber optic cables use galvanized steel wires or corrugated steel tape to provide mechanical protection for both indoor and outdoor installations.

Overview of SWA Fiber Optic Cables

Steel Wire Armored (SWA) fiber optic cables are designed to protect optical fibers from mechanical stress, crushing, rodent attacks, and environmental hazards while maintaining high-speed data transmission . They are commonly used in underground installations, outdoor networks, industrial automation, and direct burial applications . SWA cables are suitable for both single-mode (SMF) and multimode (OM1–OM5) fibers, depending on the distance and bandwidth requirements .

Types of Steel Wire Armoring

1. Galvanized Steel Wire (SWA)
   • Individual steel wires are helically wound around the cable core.
   • Provides high tensile strength for aerial or direct burial applications.
   • Protects against crushing, impact, and rodent damage.
   • Commonly used in outdoor and industrial environments .
2. Corrugated Steel Tape (STA)
   • A corrugated steel tape is wrapped around the cable core.
   • Offers flexible yet robust protection.
   • Often combined with water-blocking materials for moisture resistance.
   • Suitable for long-distance outdoor installations .

Cable Construction and Specifications

• Core: Optical fibers (single-mode or multimode) with primary coatings for protection.
• Strength Members: Kevlar yarns or E-glass yarns to enhance tensile strength.
• Armoring: Either galvanized steel wires or corrugated steel tape.
• Outer Sheath: UV-stabilized, weather-resistant, or LSZH (Low Smoke Zero Halogen) material for environmental protection .
• Water Blocking: Gel-filled or water-swellable tapes to prevent moisture ingress.
• Mechanical Ratings:
  • Tensile Strength: Designed to withstand installation and operational loads.
  • Crush Resistance: Armoring protects fibers from external pressure.
  • Rodent Resistance: Steel wires prevent damage from gnawing animals .

Applications

• Telecommunication Backbones: Single-mode SWA cables for long-distance, high-speed data transmission.
• Data Centers and LANs: Multimode SWA cables for high-bandwidth, shorter-distance connections.
• Direct Burial: Armored cables resist soil pressure, moisture, and chemical exposure.
• Industrial Environments: Protection against mechanical stress, vibration, and harsh conditions .

Summary

Steel Wire Armored fiber optic cables are essential for durable, high-performance network installations in challenging environments. The choice between galvanized steel wire and corrugated steel tape depends on the installation type, mechanical protection requirements, and environmental conditions. Proper selection ensures long-term reliability, minimal signal loss, and protection against physical and environmental hazards .