Armored optical cables are specifically designed for outdoor use, offering protection against mechanical damage, environmental stress, and rodent attacks.

Outdoor Suitability

Armored fiber optic cables are engineered to withstand harsh outdoor conditions, including extreme temperatures (–40°C to +70°C), UV exposure, wind, ice loading, and mechanical stress from construction or rodents . Their protective layers, typically made of steel or aluminum tape, provide crush resistance, tensile strength, and moisture protection, making them ideal for direct burial, aerial installations, or conduit deployment . The outer jackets, often HDPE or LSZH, further enhance durability and resist abrasion and UV degradation .

Types of Outdoor Armored Cables

1. Direct-Burial Armored Cables: Designed to be installed directly in trenches without conduit, featuring thick polyethylene jackets, steel tape or wire armoring, and water-blocking materials to prevent moisture ingress. These are suitable for underground paths exposed to rocks, construction traffic, or vandalism .
2. Aerial or Duct Armored Cables (GYTA, GYTS, GYTA53):
   • GYTA: Corrugated steel tape with aluminum-polyethylene lamination, moderate crush and rodent resistance, suitable for aerial or duct installations.
   • GYTS: Double steel tape armor for higher crush resistance, ideal for direct burial in rocky or high-traffic areas.
   • GYTA53: Heavy-duty construction with both aluminum and steel wire armoring plus thick polyethylene jacket, designed for extreme environments like river crossings or underwater ducts .
3. Armored Patch Cables: Pre-terminated cables with stainless steel tubes, suitable for short outdoor runs in conduits, offering rodent protection and mechanical durability but limited UV resistance if exposed directly .

Key Advantages

• Mechanical Protection: Armor layers prevent fiber damage from crushing, bending, or cutting.
• Rodent Resistance: Metal armoring deters chewing by animals.
• Environmental Resistance: Outer jackets and water-blocking materials protect against moisture, UV radiation, and temperature extremes.
• Long Service Life: Properly installed outdoor armored cables can last over 25 years under normal conditions .

Installation Considerations

• Match the cable type to the environment: direct burial for underground paths, aerial for overhead spans, and armored patch for conduit-based short runs.
• Ensure proper trenching depth and water-blocking measures for underground installations.
• Use UV-resistant conduit if armored patch cables are exposed to sunlight.
• Consider tensile strength and pull limitations for long-distance installations . In summary, armored optical cables are highly suitable for outdoor use, providing robust protection against physical, environmental, and biological threats, and are available in various constructions to match specific deployment scenarios.