GYFTS Corrugated Steel Tape Armored Kevlar Aramid Yarn Reinforced Underground Duct Fiber Optic Cable

GYFTS Outdoor Stranded Loose Tube Corrugated Steel Tape Armored Kevlar Aramid Yarn Reinforced Underground Duct Fiber Optic Cable

Cable Description:

1. Definition

• Model: GYFTS (Non‑metallic Reinforced, Loose Tube Stranded, Steel‑Polyethylene Bonded Sheath Outdoor Optical Cable)

• Key Features:

• Non‑metallic strength: Central FRP (Fiberglass Reinforced Plastic) core + Kevlar aramid yarn reinforcement for excellent tensile performance and electrical insulation.

• Mechanical armor: Corrugated steel tape (CST) provides superior crush, impact, and rodent resistance.

• Water blocking: Full jelly filling in loose tubes and cable core for reliable moisture protection.

• Environmental resistance: UV‑stabilized, flame‑retardant PE or LSZH outer sheath; operating temperature: -40°C to +70°C.

• Fiber options: Single‑mode (G.652D/G.657A) or multi‑mode (OM1‑OM5), core counts from 4 to 144+.

2. Key Advantages

• Lightweight & flexible: Easier duct pulling vs. all‑metal armored cables.

• Dual protection: Aramid yarn handles tension; steel tape resists compression and rodents.

• Long‑distance reliability: Ideal for underground backbone networks.

Cable Structure (Layer Stranded):

① Optical Fiber Unit

• Fibers: Single‑mode or multi‑mode, buffered and colored for identification.

• Loose tube: High‑modulus PBT plastic, filled with water‑blocking thixotropic jelly; fibers have controlled excess length for strain relief.

② Cable Core

• Central strength member: FRP rod (non‑metallic) with optional PE cushion.

• Stranding: Loose tubes (and filler rods) stranded around the FRP core in compact layers (1+6, 1+8, 1+12).

• Water blocking: Cable core fully filled with waterproof compound to prevent longitudinal water penetration.

③ Reinforcement & Armor

• Kevlar aramid yarn: Wrapped helically around the cable core for high tensile strength and flexibility.

• Corrugated steel tape: Longitudinally wrapped and corrugated for crush/rodent protection; typically plastic‑coated for corrosion resistance.

④ Outer Sheath

• Material: UV‑resistant, flame‑retardant polyethylene (FR PE) or low‑smoke zero‑halogen (LSZH).

• Function: Protects against abrasion, chemicals, and UV; final environmental barrier.

  
  

Typical Cross‑Section (from inside out)

GYFTS Cable

GYFTS-120Core

Difference in structure between the model GYFTS and GYTS:  Central Strength Member

Typical Applications:

1. Primary Use: Underground Duct Installation

• Telecom backbone: Long‑haul and metro core networks in underground conduits.

• Campus & enterprise: Building‑to‑building connections via underground ducts.

• CATV & broadband: Last‑mile and distribution networks in urban/suburban ducts.

  
  

2. Secondary Applications

• Aerial installation: With messenger wire support in areas with moderate mechanical risk.

• Direct burial: In less rocky soil where additional armor is not required.

• Industrial & utility: Power substations, oil/gas fields, and mining (non‑conductive benefit).

• Rail/transport: Signaling and communication lines alongside tracks.

3. Ideal Scenarios

• High‑rodent‑activity underground environments.

• Long‑distance duct routes requiring high tensile strength.

• Areas with lightning or electrical interference risks (non‑metallic design).

• Networks needing long‑term reliability with minimal maintenance.

Frequently Asked Questions (FAQs):

Q1: Is GYFTS cable rodent‑resistant?

Yes. The corrugated steel tape armor effectively resists rodent bites and mechanical crushing in ducts.

Q2: What fiber types and counts are available?

Fibers: G.652D, G.657A, OS2, etc.

Fiber counts: 4, 6, 8, 12, 24, 36, 48, 72, 96, 144, 288 cores (customizable).

Q3: What bending radius should be followed?

During installation: 20 × cable diameter

During operation: 10 × cable diameter

Q4: What is the temperature range?

Standard: -40°C to +70°C, suitable for outdoor and underground environments.

Q5: Can GYFTS cable be used for direct burial?

It has steel tape armor but no PE outer sheath under armor, so it is mainly for duct installation.

For direct burial, use GYFTY53, GYTA53, or GYTS53.