GYXTW53 Central Unitube Double Steel Tape Armored Double Sheathed Underground Direct Buried Fiber Optic Cable 

Model	GYXTW53
Fiber counts	2core - 24core
Tube	Central Uni-Loose Tube
Water-blocking material	Water-blokcing tape or Filling compound
Armor	Double Corrugated Steel Tape (CST)
Strength Member	2 Parallel Steel Wires
Inner Sheath	PE
Outer Sheath	PE or LSZH
Temperature Range	- 40 °C to 70 °C
Application	Duct/ UG Direct Buried Installation

Description:

This GYXTW53 outdoor fiber optic cable is designed for UG Direct Buried laying with following characteristics:

• Double Steel Tape Armor: Double Corrugated Steel Tape (CST) provide superior mechanical protection against side crush, impact, and rodent bites.

• 2 Parallel Steel Wires Strength Member: Provides high tensile resistance

• Central Unitube: Single Loose Tube filled with water-blocking gel, good protection for the fibers, this structure makes smaller size, light weight, esay installation.

Detailed Structure of GYXTW53 Armored Fiber Cable:

The fibers are placed in a loose tube made of PBT which is filled with a water-resistant filling compound. The tube is wrapped with a layer of PSP (steel tape) longitudinally. Between the PSP and the loose tube water -blocking material is applied to keep the cable compact and waterproof. Two parallel steel wires are placed at both sides of the steel tape,over which a thin PE inner sheath is applied. After the second PSP is longitudinally applied over the inner sheath,finally the cable is completed with a PE outer sheath.

Layner No.	Component
1. Optical Fibers	Single-mode (e.g., G.652D, G.657A1/A2) or multi-mode (e.g., OM3/OM4) fibers, colored with UV-resistant ink for fiber identification, loosely placed in the central tube.
2. Central Loose Tube	PBT (Polybutylene terephthalate) loose tube filled with tube gel to prevent moisture ingress and buffer the fibers from microbending.
3. Water-blocking Tape (Optional)	wrapped around the central loose tube to provide secondary water-blocking protection.
4. First CST Armor	Corrugated Steel Tape longitudinally wrapped around the central tube to ensure better moisture proof and rodent resistance.
5. Parallel Steel Wires	Two Galvanized steel wires (diameter: ~1.5-2.0mm) provide additional tensile strength
6. Inner Sheath	polyethylene (PE)
7. Second CST Armor	Corrugated Steel Tape longitudinally wrapped around the inner sheath, bonded with adhesive to improve crush resistance and rodent protection
8. Outer Sheath	Low-smoke zero-halogen (LSZH) or polyethylene (PE)

Features of GYXTW53 Fiber Optic Cable:

• Superior Mechanical Protection: The double steel tape armor and dual sheaths offer high resistance to crush, impact, and tensile forces, suitable for direct burial without additional ducting.

• Excellent Moisture and Corrosion Resistance: Water-blocking gel, water-blocking yarn or tape, and dual PE/LSZH sheaths effectively prevent moisture penetration and resist corrosion from soil, salt, and chemicals.

• Rodent and Termite Resistance: The rigid steel tape armor acts as a physical barrier against gnawing damage from rodents and termites, which is critical for underground deployment in rural or forested areas.

• Low Attenuation and Stable Performance: The central loose tube structure minimizes microbending loss, ensuring consistent optical transmission even under environmental stress (temperature variation, soil settlement).

• Easy Installation: Light weight compared to traditional heavy armored cables, it supports direct burial, trench laying, and horizontal directional drilling (HDD) installation methods.

• Environmental Compliance: LSZH sheath options meet flame-retardant and low-toxicity requirements for applications in environmentally sensitive areas.

Applications:

• Underground Direct Burial Networks: Primary application for long-haul backbone networks, urban access networks, and rural broadband projects, where cables are buried directly in trenches without duct protection.

• Harsh Environmental Deployment: Suitable for areas with rocky soil, high soil pressure, or corrosive soil conditions (e.g., coastal regions, industrial zones with chemical contamination).

• Rural and Remote Area Connectivity: Ideal for connecting remote villages, farms, and industrial sites where duct installation is costly or impractical.

• Municipal and Utility Networks: Compatible with infrastructure projects such as smart city deployments, traffic monitoring systems, and power utility communication links.

FAQs:

Q1: What is the difference between GYXTW and GYXTW53 cable?

• GYXTW: Single steel‑tape armour, one outer PE sheath. Mainly for duct, shallow burial. Lower crush & rodent resistance.

• GYXTW53: Double steel‑tape armour + inner PE sheath + outer PE sheath (double sheath). Much higher anti‑crush, anti‑impact, anti‑rodent performance, specially designed for direct burial.

Q2: Is GYXTW53 rodent‑proof and termite‑proof?

The double corrugated steel tape provides strong physical protection against rodent gnawing.

Q3: Can it resist long‑term underground water immersion?

Water‑blocking gel inside loose tube + water‑blocking yarn + sealed double steel tape barrier prevent water longitudinal spread. It can withstand damp soil and underground water. But it is NOT a submarine cable; do not deploy for long‑term underwater submersion in rivers or lakes.

Q4: Outer sheath options: PE or LSZH?

Standard: Black HDPE sheath — best for underground direct burial, UV‑resistant, anti‑corrosion, low cost. 

LSZH sheath is optional, mainly for tunnel, indoor‑outdoor transition sections; not the first choice for direct‑buried outdoor projects.

Q5: What is the maximum fiber core number for GYXTW53?

it is a single central loose tube design, standard max fiber count is 24 cores.