Armored Cable

own brand

 

 

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

 

 

 

Pack and ship

 

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

 

 

 

# Complete Introduction to GYXTS Center-Tube Type Steel Wire Armored Rodent-Proof Optical Cable

## I. Meaning of Model Letters (National Standard Optical Cable Naming)

**GYXTS**

- **G**: Outdoor optical cable for communication

- **Y**: Metal reinforcing member (steel wire)

- **X**: Center-Tube Type (single loose tube, all optical fibers concentrated in the center of the cable core)

- **T**: Filled Type (loose tube, cable core fully filled with water-blocking grease)

- **S**: Single fine round steel wire wrapped armor (core rodent-proof, tensile-resistant structure)

Full Name: **Metal-reinforced, center-tube filled, fine round steel wire armored, steel-plastic bonded sheath outdoor optical cable**, commonly known in the industry as **center-loose tube type rodent-proof optical cable**.

## II. Layered Internal Structure (From Inside to Outside)

1. **Fiber Optic Cable** Mainstream G.652D single-mode fiber, full colorimetric separation; 2-24 cores, all housed within a single central loose tube.

2. **Fiber Grinder (Tube Filler)** The PBT loose tube is fully filled with waterproof fiber grinder, isolating moisture, buffering vibration, and protecting the fiber from compression damage.

3. **PBT Loose Tube** High-modulus polyester material, hydrolysis resistant, high strength; precisely controls fiber excess length, preventing fiber stretching under high and low temperature conditions.

4. **Water-Blocking Tape** Wraps around the loose tube, achieving **full longitudinal water blocking**, preventing rainwater from seeping into the cable.

5. **Phosphated Fine Round Steel Wire Armor Layer (Core S-Structure)** Multiple high-strength phosphated steel wires are evenly wound around the loose tube, achieving three major functions in one layer:

- Superior tensile strength, less prone to breakage under aerial/direct burial drag;

- High lateral pressure resistance, less likely to damage the optical fiber under crushing or squirting;

- **Anti-rodent gnawing**, the metal wire prevents rats and squirrels from chewing through the optical cable (ideal for mountainous and forested areas).

6. **PSP Steel-Plastic Composite Water-Barrier Tape** Double-sided chrome-plated plastic-coated steel tape longitudinally wraps the cable, laterally isolating groundwater and moisture, creating a double-layer moisture barrier.

7. **Black PE Outer Sheath** High-density polyethylene, UV resistant, aging resistant, acid and alkali resistant, suitable for outdoor environments.

## III. Core Product Features

1. **Excellent Rodent-Proof Performance** Steel wire armor replaces ordinary steel tape, offering significantly stronger resistance to rodent bites than GYTA/GYTS. This greatly reduces network interruptions caused by rodent damage in mountainous, rural, and forested areas, making it the primary choice for operators' mountainous projects.

2. **Strong Mechanical Performance**

- Short-term allowable tensile force 3000N, long-term 1000N;

- High lateral pressure resistance, suitable for light direct burial and shallow burial along roads;

Also possesses flexibility, preventing damage during deployment and bends.

3. **Small Size, Light Weight, and Conduit Saving** With a core count 30%–40% smaller outer diameter than stranded armored optical cables, the weight per kilometer is lower, making manual handling and air-blowing installation in conduits easier and saving conduit resources.

4. **Fully Waterproof and Wide Temperature Range** Double-layer water-blocking design inside the conduit and in the cable core; operating temperature **-40℃～+70℃**, stable for use in both extremely cold and hot southern outdoor environments.

5. **Cost Advantage** Compared to stainless steel rodent-proof fiber optic cable (GYTA43), it uses less material and has a lower cost, making it suitable for large-scale metropolitan area networks and rural broadband coverage.

## IV. Laying Scenarios and Applicable Environments

### Construction Methods

- **Aerial Laying**: Rural pole lines, mountainous aerial installations (most common)

- **Dual-line Laying**: Municipal and residential communication pipelines, air-blown micro-ducts

- **Light Direct Burial**: Shallow burial in suburban areas without heavy vehicle traffic.

### Typical Application Scenarios

1. Rural broadband for telecom operators, rural FTTH backbone;

2. Communication lines in mountainous areas, forest farms, orchards, and other areas with high rodent infestation;

3. Metropolitan area network access layer, park monitoring backbone;

4. Water conservancy and power field supporting communication fiber optic cables.

### Not Recommended Scenarios

Roads with long-term heavy vehicle traffic, deep burial in roadbeds (requires heavy armor GYTS53/GYTA53), underwater laying.

## V. Key Technical Parameters (Standard 2-24 Core Specifications)

1. Optical Fiber: G.652D, 1310nm attenuation ≤0.36dB/km, 1550nm ≤0.22dB/km

2. Cable Outer Diameter: Approximately 8.3-9.5mm for 2-12 cores

3. Bending Radius: Static 10 times cable diameter, Dynamic 20 times cable diameter

4. Service Life: Over 25 years outdoors

5. Standards: YD/T 769-2010, IEC 60794-1 Outdoor Optical Cable Standard

## VI. Comparison with Similar Optical Cables

1. **GYXTS vs GYTS**
GYTS is steel tape armored, with poor rodent protection; GYXTS is wrapped with fine round steel wire, primarily for rodent protection and stronger tensile strength.

2. **GYXTS vs GYXTW**
GYXTW is reinforced with only two parallel steel wires, cannot be directly buried, and rodent-proof not very well compared with GYXTS; GYXTS has a full-circle steel wire armor, significantly improving its protection level.

3. **GYXTS vs GYTA53**
GYTA53 is a layered stranded heavy-duty armor, with a large outer diameter and high cost; GYXTS is a compact and lightweight center-tube type, suitable for light-load outdoor overhead/pipeline applications.

# GYXTS Fiber Optic Cable Complete Disadvantages (Structure, Construction, Scenarios, Comparison Shortcomings)

## I. Inherent Drawbacks of the Center Tube Type (Single Loose Tube Structure)

1. **Low Upper Limit for High Core Count, Extremely Poor Cost-Effectiveness for High Core Count Lines**
GYXTS only has a **single center loose tube**, with a conventional maximum of 24 cores. Beyond 24 cores, the tube diameter increases dramatically, the cable becomes thicker, and the difficulty of controlling excess length skyrockets, increasing attenuation and fiber breakage risks. For the same 72/96/144 cores, stranded GYTA/GYTA53 uses multiple smaller tubes, resulting in more even fiber stress and significantly better production stability and ease of maintenance and splicing compared to GYXTS.

GYXTS is generally not used for large-scale backbone and metropolitan area network (MAN) high-core-count lines.

2. **Concentrated stress in the sheath, localized compression easily leads to mass fiber damage** When all fibers are squeezed into a single PBT loose tube, if the cable is locally crushed by heavy objects, stones, or dragged and blocked, the entire tube of fibers is simultaneously compressed, easily resulting in **mass attenuation, excessive microbending loss, and even multi-core fiber breakage**.

Stranded sheaths distribute stress, so damage to a single sheath will not affect all fibers.

3. **Microbending loss control at high and low temperatures is inferior to stranded sheaths** When fibers are crowded in a single sheath, they are compressed together during low-temperature contraction and high-temperature expansion, making microbending loss more likely to exceed limits for long-distance transmission at 1550nm; this is not ideal for ultra-long trunk lines without repeaters.

## II. Shortcomings of Fine Round Steel Wire Armor (S Layer)

1. **Weaker Resistance to Heavy Pressure and Direct Burial Under Heavy Loads than Double-Layer Armor GYTA53**
GYXTS uses only one layer of fine round wrapped steel wire + a single layer of PSP steel strip, **without inner protection or double-layer sheath**:

- Unsuitable for heavy-load highway subgrades, long-term compaction by heavy trucks, deep burial in rock excavation, and heavy-duty municipal road sections;

- The standard long-term flattening force is only 1000N/10cm, far lower than the long-term compressive strength of GYTA53 double-layer armor (3000N+). Deep burial and heavy loads easily lead to sheath cracking and armor deformation damaging the bundle tube.

2. **Metal armor is prone to lightning strikes and conduction, posing significant risks in high-voltage and high-current areas.** The outer continuous steel wire armor forms a complete conductive circuit:

- In mountainous areas prone to lightning strikes, near high-voltage transmission lines, and around substations, lightning current can easily conduct along the armor, damaging junction boxes and optical modules, requiring additional grounding throughout the entire line, increasing construction costs;

- Compared to GYTA aluminum armor and non-metallic ADSS, its lightning protection and insulation performance are inferior.

3. **Steel wire is prone to corrosion (water ingress accelerates aging after damage).** Once the outer sheath is scratched or damaged, groundwater and rainwater seep in, causing the phosphated steel wire to gradually rust and expand. The rust layer compresses the inner loose tube, leading to increased mass losses within a few years;

GYTA53 double-layer sheath has a buffer inner protection, significantly slowing the spread of corrosion after damage.

4. **Slightly less flexible than GYTS steel tape armor, limiting construction in narrow bends** The multiple stranded round steel wires provide greater rigidity, resulting in greater bending resistance when passing through narrow bends, dense pipe groups, or small-radius coils in wells; dynamic bending must strictly meet 20 times the cable diameter, as excessively small bends can easily cause armor bulges and bundle deformation.