Direct Buried Optical Fiber Cables – GYTY53, GYTA53, GYFTA53 Series

■ Direct Buried Optic Fiber Cable | Armored Fiber Optic Cables for buried application. 

These cables have been engineered for direct underground installation and are guaranteed to withstand any conditions without the need for extra conduit. These cables assure supreme mechanical strength, high resistance to moisture, and great ecological durability. They are the best solution for areas where duct insertion is impossible, including rural network areas, long-distance trunk lines, and open-field conditions where no covered area exists.

 

■ Direct Buried Optical Cable Key Design Features 

Direct-buried fiber optic cables typically consist of multiple layers of protection to withstand underground conditions, including: 

• Loose Tube Design: Optical fibers here are being laid down inside of loose tubes filled with gel that is designed for water resistance. 

• Central Strength Member (steel or FRP): Provides tensile strength and structural integrity for the fiber optic cable. 

• Double Armoring: In all models, steel tape armor and a polyvinyl chloride (PVC) sheath are common elements, and such armor is often in double layers for enhanced rodent and crushing resistance. 

• Moisture Barrier: A moisture-migration barrier tape or jelly blocks moisture from pulling along. 

• Outer Sheath: Heavy-weight, highly durable UV-stabilized PE or optional nylon outer sheath. The Flame-Retardant Shelter (FRS) can be manufactured in various colors, allowing customers to select their own designs.

 

■ Direct Buried Optical Cable Application Scenarios

Direct buried fiber optic cables are often deployed in: 

• Long-distance trunk line segments in countryside areas and developmentally void parking lots. 

• Suburban backbone equipping schemes with no service avenue for the underground. 

• In field installations, the feeder cables for FTTH are usually in greenfield situations. 

• Mechanical protection is an essential requirement for underground installations, making them more suitable. 

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■ Common Models of Direct Buried Cables

Model	Structure	Strength Member	Armoring	Fiber Count	Sheath Type
GYTY53	Loose tube + steel tape + PE sheath	Central Steel	Steel tape armor	2–288	Dual PE
GYTA53	Loose tube + AL tape + steel tape + PE	Central Steel	AL + steel tape	2–288	Dual PE
GYFTA53	Loose tube + FRP + steel tape + PE	FRP (non-metal)	Steel tape armor	2–144	PE

 ✅ All models are designed for direct burial and provide high crush resistance and protection against rodents, soil pressure, and water ingress.

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■ How to Choose the Right Direct Buried Optical Cable

Selecting the correct direct-buried optical fiber cable is crucial for ensuring long-term reliability in underground environments. Below is a structured selection guide based on installation conditions, mechanical protection, fiber requirements, and environmental considerations.

1. Choose Based on Installation Environment

Underground Environment	Recommended Cable Type	Key Features
Standard soil conditions	GYTY53	Dual PE sheath + steel tape armor for crush protection
Areas with high moisture or flooding	GYTA53	AL-tape + steel tape dual armor for enhanced water resistance
EMI-sensitive or power-adjacent trenches	GYFTA53	All-dielectric (non-metallic) FRP strength member

 

2. Choose Based on Structural Protection Needs

Protection Requirement	Suggested Cable Type	Notes
Strong crush & rodent resistance	GYTY53/ GYTA53	Steel tape armor handles soil pressure and rodents
Non-metallic design (no grounding)	GYFTA53	Safer for power trench and lightning-prone areas
Additional moisture blocking	GYTA53	AL-tape layer acts as a moisture barrier

 

3. Choose Based on Fiber Type & Network Scenario

Network Application	Recommended Fiber Type	Explanation
Long-haul trunk transmission	G.652.D	Low attenuation, standard single mode fiber
Shorter access / FTTH backbone	G.657.A1	Bend-insensitive, compatible with G.652.D
Dense duct routes or sharp turns	G.657.A2	Ultra bend-resistant for compact routing

 

■ Fiber Specification Snapshot

Direct buried cables can be manufactured with G.652.D, G.657.A1, or G.657.A2 fibers:

Fiber Type	Attenuation @1310nm	Macro Bending Resistance	Best Use Case
G.652.D	≤ 0.35 dB/km	Standard	Long-distance backbone
G.657.A1	≤ 0.34 dB/km	Enhanced	Complex routing
G.657.A2	≤ 0.34 dB/km	Ultra Bend-Insensitive	Tight underground ducts

 

■ Fiber & Tube Color Coding

Fiber color coding follows TIA/EIA-598 or YD/T standards, using the standard 12-color sequence (Blue, Orange, Green, Brown, Grey, White, Red, Black, Yellow, Violet, Pink, Aqua). Tubes are coded similarly. Additional fiber counts repeat the color sequence with color ring marks.

Fiber Color Standard Sequence

No.	1	2	3	4	5	6
Color	Blue	Orange	Green	Brown	Gray	White(Natural)
No.	7	8	9	10	11	12
Color	Red	Black	Yellow	Violet	Pink	Aqua

Note:

1. If there are less than 12 fibers in a loose tube, the color sequence is followed continuously, starting from No.1,
2. In the standard color sequence, No.6 white color can be replaced by natural color, called the W color sequence.
3. Color arrangement can be customized.

Tube Color Standard Sequence

No.	1	2	3	4	5	6
Color	Blue	Orange	Green	Brown	Gray	White(Natural)
No.	7	8	9	10	11	12
Color	Red	Black	Yellow	Violet	Pink	Aqua

 

■ Cable Marking and Packing

• Standard Drum Length: 2000–4000m per wooden drum. 

• Drum Markings: Manufacturer, fiber type, production year/month, gross/net weight, and project number (optional). 

• Packaging: Each reel is protected with plastic buffer film and secured with wooden battens.

■ Need a Reliable Supplier of Outdoor Optical Cables?

Zion Communication offers: 

✔ Large selection of outdoor fiber cable categories. 

✔ A/B (OEM/ODM) branding into the problem you need. 

✔ Compatibility with ITU-T, IEC, and TIA/EIA standards. 

✔ Cost-effective and rapid delivery. 

Contact us now to get datasheets, samples, and a project-based quote.

Customize Your Outdoor Optical Fiber Cable