Armored optical cable ordinary optical cable

Armored optical cables feature a protective metal layer for enhanced durability, while ordinary optical cables rely on polymer jackets and are less resistant to physical damage.

Structural Differences

Armored Optical Cable: These cables include an additional protective layer, typically made of corrugated steel tape (STA), steel wires (SWA), or stainless steel tubes, wrapped around the fiber core. They also contain strength members such as aramid yarns or FRP rods to provide tensile strength, and an outer jacket made of PE, PVC, or LSZH for environmental protection . Some armored cables are double-armored for extreme conditions, such as submarine or mining applications .

Ordinary Optical Cable: Non-armored cables rely on a polymer jacket and internal buffer layers to protect the fibers. They may include aramid yarns for tensile strength but lack metal armor, making them more vulnerable to crushing, rodent damage, and harsh environmental conditions .

Mechanical and Environmental Advantages

• Crush Resistance: Armored cables withstand heavy loads in ducts, tunnels, or direct burial, whereas ordinary cables are suitable for controlled indoor environments .
• Rodent Protection: The metal armor prevents damage from rats, termites, and other pests, which ordinary cables cannot reliably resist .
• Longevity: Armored cables typically last 20–30 years in harsh environments, while ordinary cables have shorter service life under similar conditions .
• Water and Moisture Barrier: Steel layers in armored cables prevent water ingress and swelling, enhancing reliability in outdoor or underground installations .

Performance Considerations

Both armored and ordinary cables maintain high optical performance, with single-mode or multi-mode fibers transmitting data efficiently. Armored cables may have slightly higher tensile strength (600–1000 N) and wider operating temperature ranges (-40°C to 70°C) compared to ordinary cables (500–800 N, 0°C to 60°C), .

Applications

• Armored Cables: Ideal for outdoor, industrial, underground, or high-traffic environments, including metro backbones, data centers, direct burial, and harsh installations .
• Ordinary Cables: Suitable for indoor, controlled environments, such as offices, medical facilities, and short-distance runs where mechanical stress is minimal .

Cost Implications

Armored cables are more expensive due to the additional metal layers and enhanced protection, while ordinary cables are cheaper and easier to install in low-risk environments . Choosing the wrong type can lead to maintenance issues or installation failures, so selection should consider environmental risks, installation method, and long-term reliability .

Key Takeaway

Armored optical cables provide superior mechanical protection, durability, and environmental resistance, making them suitable for harsh or high-risk installations. Ordinary optical cables are cost-effective and sufficient for controlled indoor environments, but they are less resilient to physical damage and environmental stress. Selecting the appropriate cable type is critical for network longevity and performance.