Direct buried fiber optic cable is designed to be buried directly underground without additional protection. It has a double sheath and Kevlar yarn to protect the cable. Common types of direct buried cable include GYTA53, GYXTW53, and GYFTY53, which feature steel tape armor, loose tube stranding, and water blocking structures to resist moisture and mechanical damage when buried. Direct buried cables are widely used for fiber optic networks in applications like subways, tunnels, long-distance communication, and outdoor access networks.

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Direct buried fiber optic cable is designed for direct buried installation, buried directly underground
without protection. Direct buried fiber optic cable usually with double sheath and Kevlar yarn for
protection.This article can help you learn more about direct buried fiber optic cable.
What is Direct Buried Fiber Optic Cable?
Direct buried fiber optic cable is a type of fiber optic cable which is armored with a steel tape or
steel wire outside. With the performance of resisting external mechanical damage and soil erosion,
it can be buried directly into the ground in a trench or using a vibratory plow. Direct burial is the
most convenient laying method for fiber optic cable and also saves duct and aerial installation
costs. Generally speaking, direct buried cables provide good mechanical and temperature
performance, crush resistance and flexibility for direct buried construction, convenient

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construction and installation,plastic coated aluminum tape (APL) moisture barrier, plastic-coated
steel tape (PSP) enhancing moisture-proof, and water-blocking material for an underground
application.
Direct Buried Cable Types
There are several types of direct burial cables available in the market. Some of the most commonly
used ones are GYTA53, GYXTW53, and GYFTY53.
GYTA53: GYTA53 fiber optic cable is a double jacket double armored stranded loose tube outdoor
cable. The loose tube stranding technology makes the fibers have good secondary excess length
and allow the fibers free movement in the tube, which keeps the fiber stress-free while the cable is
subjected to longitudinal stress. Corrugated steel tape armored and double polyethylene (PE)
sheath provide excellent crush resistance and rodent resistance. Metal strength member provides
excellent strain performance. It is suitable for direct buried and duct applications.

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GYXTW53: GYXTW53 is a central loose tube fiber cable with a double steel tape and a double PE
jacket. The cable provides a full section water blocking structure that ensures good water and
moisture resistance, a loose sleeve filled with special ointment for critical fiber protection, two
parallel round wires that resist tension and side pressure, a small outside diameter, lightweight,
and excellent bending performance.
GYFTY53: GYFTY53 is a double sheath outdoor fiber optic cable of non-metallic strength member,
loose tube layer stranded filling type, with Polyethylene inner sheath, non-metallic fiber
reinforcement, and LSZH outer sheath. The cable provides a full cross-section water-blocking
structure to ensure good water-blocking and moisture resistance , loose tube is filled with special
ointment for key protection of fiber, glass yarn to ensure the the cable has good tensile properties,
and rat-bite prevention, and non-metallic strength member is applicable for multi-thunder area.

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Applications Scenarios
Direct buried cables are widely used in subways, tunnels, long-distance
communication,inter-office communication network, core network, metropolitan area network
(MAN), local area networks (LAN), access networks outdoors, telecommunication, video, data
transmission, CATV,and more.
Conclusion
Direct burial cables do not require any additional protective covers to be buried directly into the
ground. They may be exposed to harsh environmental conditions such as changes in temperature
and humidity of the soil. Direct buried cable offers the benefits of less frequent replacement and a
better chance of maintaining integrity even in the event of a natural disaster.Sun Telecom provides
all directly buried cable products and solutions to the global market.