24 Core Direct Burial Fiber Cable

30+ years

Our factory was found in 1992, first start with coaxial cable which was one of the biggest manufacturers in lin'an city.In year of 2001 started focusing on the production of optical cables.

30+ countries

In year of 2008, set up international sales department and sale optical fiber cable to more than 30 countries and have 18 years` rich experience to export cables .

• Proper design, precise control for fiber excess length and distinct stranding process render the cable excellent mechanical and environmental properties.
• Double-jacket structure make cable have nice properties of moisture resistance and crush resistance.

• Transport/storage temperature: -40℃ to +60℃

• Standard reel length: 2km/drum; other lengths are also available.

IS09001:2015, CE, China Radio and television equipment network access certification

FTTH drop cable-Ink printing

Flat cable-Plasma pringting

Outdoor cable GYTC8S-Iron printing

Jumper cable- SC/UPC-SC/APC

GYTC8S 24 core -wooden drum

FTTH cable-1km drum

FTTH cable-carton packing

Patch cords-Pallet package

 

 

Patch cords in Pallet delivery

FTTH cable in cartons packing

Flat cable in plywood drum package

Composite drum full loaded into contianer

Solid wooden drum loading photo

 

 

Direct-Buried Optical Cable Introduction

Direct-buried optical cable is a method of laying communication optical cables by directly burying optical cables with specific protective structures underground. This method is widely used in open fields, suburban areas, along urban and rural roads, highways, and railway lines, and is a crucial foundation for building backbone communication networks.

1. Structural Characteristics and Models
To adapt to the complex underground environment, direct-buried optical cables typically employ reinforced protective structures:

**Armor Protection:** The outer layer often uses a steel tape or steel wire armor structure. Steel tape armor (e.g., model suffix "53") primarily provides resistance to lateral pressure, preventing crushing by heavy objects; steel wire armor (e.g., model suffix "33") provides stronger tensile strength, suitable for scenarios with significant terrain undulations or requiring long-distance traction.

**Protective Performance:** It possesses excellent resistance to mechanical damage, soil corrosion, and rodent bites (e.g., rats), while also having good waterproof and moisture-proof properties, ensuring the stability of fiber optic transmission.

Common models include GYTY53 (loose-tube stranded filled steel tape armor), GYTA53 (with added aluminum tape longitudinal sheathing for better moisture resistance), and GYTA33 (steel wire armor for high tensile strength).

2. Construction and Laying Specifications

The construction quality of directly buried optical cables directly affects the line's lifespan and mainly follows these standards:

Buried Depth Requirements: No less than 1.2 meters in ordinary soil; no less than 1.0 meter in semi-rocky areas; no less than 0.8 meters in fully rocky areas; no less than 1.2 meters when crossing railways or highways; no less than 1.0 meter for urban sidewalks.

Trench Bottom Treatment: The trench bottom must be flat and free of gravel. In rocky or semi-rocky areas, a 10 cm thick layer of fine soil or sand must be laid at the trench bottom and above the optical cable as a bedding layer to prevent sharp objects from damaging the cable sheath.

Laying Method: Mechanical traction or manual lifting can be used. On slopes with a gradient greater than 20 degrees and a length greater than 30 meters, an "S"-shaped laying pattern is recommended to allow for expansion and contraction and reduce the impact of gravity-induced slippage. When laying multiple optical cables in the same trench, they must not cross or overlap, and the parallel clearance should not be less than 10 centimeters.

Bending Radius: The static bending radius should not be less than 15 times the outer diameter of the optical cable, and the dynamic bending radius should not be less than 20 times.

3. Marking and Maintenance

Marker Installation: Markers must be installed at key locations such as optical cable joints, bends, and reserved areas. Markers are typically white with red lettering, a red marker at the top, and a black arrow indicating direction. They should include the marker number, type, and contact number for maintenance and fault location.

Backfilling Requirements: When backfilling, first cover with a 15-centimeter layer of loose or fine soil and tamp it down manually. It is strictly forbidden to fill with stones, bricks, or frozen soil. The soil should be tamped down every 30 centimeters, and the final backfill should be 10 centimeters above ground level to prevent settlement.

Protective Measures: When crossing railways, busy highways, or areas prone to excavation, steel pipe protection or directional drilling should be used for pipe laying. In areas prone to thunderstorms, metal components at fiber optic cable joints should be electrically disconnected, and lightning protection drain lines or surge protection devices should be installed.

4. Advantages and Applications:

Direct-buried fiber optic cables offer advantages such as good concealment, high security, and immunity to weather conditions, making them particularly suitable for long-distance trunk lines and access networks with low pedestrian and vehicle traffic and relatively stable geological conditions. Although initial construction costs are higher and subsequent maintenance and repair are relatively difficult, their long-term operational stability and anti-interference capabilities make them an important choice for communication infrastructure.

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