Direct Buried Optical Fiber Cable Double Sheath - TELEXC

Direct Buried Installation Optical Fiber Cable Double Sheath

Direct Buried Installation Optical Fiber Cable Double Sheath
APL (aluminum-plastic composite tape) and PSP (plastic-coated steel tape) enhance moisture resistance.
Offers high-density SZ-stranded cores available from 24 to 288 fibers for seamless network expansion.
Supports G.652D, G.657A, and G.655C single-mode fibers to meet diverse bend-insensitivity demands.
Ensures ultra-low attenuation characteristics (≤0.36 dB/km at 1310 nm; ≤0.22 dB/km at 1550 nm) for long-distance transmission.
Provides versatile deployment options for direct burial, duct, conduit, and aerial installations.
Combines gel-filled PBT tubes (2.0mm) with an FRP central rod to deliver complete waterproof protection.
Delivers a future-proof, robust infrastructure solution for FTTH and outdoor fiber optic networks.
High rodent protection

Direct Buried Installation Optical Fiber Cable Double Sheath
General Specifications
Cable Type	Double Sheath PSP(Plastic Coated Steel Tape) APL(（Aluminum Polyethylene Laminate) Enhanced Armor
Construction Type	Armored
Subunit Type	Gel-filled
Jacket Material	PE (Polyethylene)
Jacket Marking	Feet/Meter
Subunit, quantity	1-24
Total Fiber Count	24	48	72	96	144	288
Active tubes	1-24
Fibers per Subunit, quantity	12
Dimensions
Buffer Tube/Subunit Diameter	2.4 mm (0.094 in)
Diameter Over Jacket	14.2 mm (0.559 in)	15.0 mm (0.591 in)	15.0 mm (0.591 in)	16.8 mm (0.661 in)	20.0 mm (0.787 in)	22.4 mm (0.882 in)
Mechanical Specifications
Minimum Bend Radius, loaded	213 mm (8.386 in)	225 mm (8.858 in)	225 mm (8.858 in)	252 mm (9.921 in)	300 mm (11.811 in)	336 mm (13.228 in)
Minimum Bend Radius, unloaded	142 mm (5.591 in)	150 mm (5.906 in)	150 mm (5.906 in)	168 mm (6.614 in)	200 mm (7.874 in)	224 mm (8.819 in)
Tensile Load, Installation, maximum	2700 N (607 lbf)
Tensile Load, Operation, maximum	900 N (202 lbf)
Compression	44 N/mm \| 251.247 lbf/in
Flex	25 cycles
Impact	4.41 N-m \| 39.032 in lb
Twist	10 cycles
Optical Specifications
Fiber Type	G.652.D and G.657.A1
Attenuation, maximum	0.3 dB/km @ 1,550 nm \| 0.4 dB/km @ 1,310 nm/1383 nm
Environmental Specifications
Installation temperature	-15 °C to +55 °C (+5 °F to +131 °F)
Operating Temperature	-40 °C to +70 °C (-40 °F to +158 °F)
Storage Temperature	-40 °C to +70 °C (-40 °F to +158 °F)
Water Penetration	Sample length: 3m \| Water head: 1m \| Time: 24h No leakage Water Test: IEC 60794-1-22 Method F5
Environmental Test Specifications
Environmental Space	Direct buried \| Duct installation \| Outdoor
Cable Freeze	-20 °C to +60 °C (-4 °F to +140 °F)
Packaging and Weights
Cable weight	210 kg/km (141.113 lb/kft)	230 kg/km (154.553 lb/kft)	230 kg/km (154.553 lb/kft)	280 kg/km (188.151 lb/kft)	350 kg/km (235.189 lb/kft)	440 kg/km (295.666 lb/kft)

1. Long-Haul Trunk Networks & Backbone Lines

Characteristics: Used to connect high-capacity communication backbones across cities, regions, or international borders.

Key Advantages: Direct trenching is more cost-effective than long-distance aerial pole lines across plains, hills, or mountains. It offers extreme reliability by being immune to severe weather conditions like typhoons and icing.

2. Rural & Suburban Network Expansion

Characteristics: Extends high-speed fiber networks from urban backbones to remote villages, new industrial zones, or development parks.

Key Advantages: In areas lacking underground conduit (duct) infrastructure and where installing poles is impractical, direct burial is the most economical and fast way to achieve broadband coverage.

3. Transportation Corridors (Highways & Railways)

Characteristics: Deployed along green belts or roadbeds parallel to highways, national roads, railways, or urban transit lines.

Key Advantages: Leverages existing transportation rights-of-way for easier construction and maintenance. The armored structure withstands heavy traffic vibrations and ground pressure.

4. Energy & Industrial Infrastructure

Oil & Gas Pipelines: Buried in the same trench or parallel to pipelines for real-time monitoring data transmission and dispatch communications.

Wind & Solar Farms: Interconnects individual turbines/solar arrays with booster stations and control centers, withstanding harsh freeze-thaw cycles, extreme sun exposure, and heavy construction equipment loads.

Mining & Industrial Plants: Secure communication links across plant perimeters or complex mining terrains.

5. Extreme Environments & Harsh Terrains

Cold & High-Altitude Regions: Prevents icing and breakage common in aerial lines; burying below the frost line ensures year-round stability.

Rodent & Termite Heavy Areas: Uses Corrugated Steel Tape Armor (CSTA) or Steel Wire Armor (SWA) to prevent rodents and insects from biting through the outer jacket.

Q1: How deep should underground fiber optic cables be buried?

A: Underground fiber cables are typically buried at a depth of 18 to 36 inches, depending on local regulations, soil composition, and specific site conditions.

Urban Areas: Typically 12–24 inches.
Rural or High-Traffic Zones: Often requires 24–48 inches for enhanced mechanical protection.

Note: Always comply with local municipal codes and industry standards prior to installation to minimize the risk of external damage and ensure long-term operational safety.

Q2: Which fiber types are best for underground installation?

A: The most suitable cables for underground deployments are loose tube cables and armored fiber cables:

Loose Tube Fiber Cable: Offers exceptional resistance to moisture and environmental fluctuations, making it ideal for conduit/duct installations.
Armored Fiber Cable: Features a protective metallic layer that shields against rock pressure, rodents, and construction stress, making it the top choice for direct burial or harsh environments.

Selection Tip: Evaluate your conduit usage, soil conditions, and external risk factors to choose the optimal cable for long-term durability.

Q3: How long does an underground fiber installation take?

A: Project timelines vary based on scope, terrain, installation complexity, and permitting requirements.

Small Projects: Residential or small commercial jobs typically take a few days.
Large Projects: Municipal, campus, or industrial deployments can take several weeks to months.

Factors to Consider: Roadwork, multi-party coordination, and municipal permitting significantly impact schedules. Early, careful planning is essential for on-time project completion.

Q4: Does underground fiber cable require maintenance?

A: Yes. Although underground cables are protected from many overhead environmental hazards, routine inspections and preventive maintenance are vital for long-term network reliability. Standard maintenance practices include:

Visual inspections
Optical performance testing
Path monitoring to detect signal degradation or environmental risks early

Proactive maintenance helps minimize unexpected outages and ensures peak network efficiency over time.

Engineered for Reliability, Built for Trust

At Telexc, we don’t just supply hardware—we secure your global network deployment. Operating from China’s premier industrial clusters and the Tianjin logistics hub, we act as your private supply chain control tower, ensuring engineering precision and traceably consistent quality for every aerial installation.

Our Core Advantages

Full-Scenario Aerial Compatibility: We seamlessly bridge the gap between OSP fiber infrastructure, FTTH networks, and aerial deployment scenarios. Every component is structurally engineered to work harmoniously together, drastically increasing on-site installation efficiency.
Strict Engineering Standard Alignment: Our technical design loops strictly align with international benchmarks, including IEC, ITU-T, and IEEE standards. This ensures our hardware excels under extreme environmental stresses—from intense UV exposure to heavy wind and ice loads.
Independent Multi-Stage Quality Control: We act as your eyes on the ground. From raw material stress simulations to finished product compliance, our dedicated QC team performs rigorous multi-stage audits so you receive exactly what your engineers approved.
Optimized Logistics & Flexible Partnerships: Leveraging the logistics power of the Tianjin port, we guarantee reliable transit, competitive factory-direct structures, and transparent milestone tracking to keep your network projects moving forward without compromise.

Direct Buried Installation Optical Fiber Cable Double Sheath