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Fiber Optic Cables

Duct Fiber Optic Cables for Underground Conduit Networks | ZION

Duct fiber optic cables are outdoor cables designed to be pulled or installed through protective conduit. ZION offers central-tube and stranded loose-tube constructions with APL, PSP, FRP tape, glass yarn or non-armored protection, plus gel-filled and semi-dry options. Choose by duct condition, pulling load, crush risk, metallic restrictions, water exposure, rodents, fiber count and installation method.

Which Duct Fiber Cable Construction Fits the Route?

Start with the duct environment and installation method, then choose the tube layout, strength member, armor and water-blocking system. This range contains 18 product entries; final fiber count, dimensions and mechanical ratings must be confirmed for the selected construction.

GYTA GYTS GYFTY duct optical fiber cable series

SERIES OVERVIEW

GYTA / GYTS / GYFTY Series

A starting point for comparing APL-armored, PSP-armored and all-dielectric stranded loose-tube duct cables. Use it to select a structural family, then confirm the exact model data.

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GJYXFHA GJYXFHS light armor bow type drop optical fiber cable

DROP CABLE

GJYXFHA / GJYXFHS

A light-armored bow-type drop cable for access segments. Consider it for the final duct or outdoor drop section; confirm the suffix, armor, fiber count and permitted installation method.

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GYFA APL armored stranded loose tube optical fiber cable

APL ARMOR

GYFA

A stranded loose-tube cable with APL armor. Consider it when a metallic moisture barrier and moderate radial protection are required; confirm the central strength member and grounding rules.

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GYFS PSP armored stranded loose tube optical fiber cable

PSP ARMOR

GYFS

A stranded loose-tube cable with PSP armor for stronger radial protection than a non-armored design. Confirm pulling tension, crush rating, metallic bonding and duct size.

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GYFS semi dry PSP armored stranded loose tube optical fiber cable

SEMI-DRY PSP

GYFS Semi-Dry

A semi-dry stranded loose-tube cable with PSP armor. Consider it when cleaner preparation is wanted without giving up metallic radial protection; verify the completed water-penetration performance.

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GYFTA GFRP central strength member APL armored cable

GFRP + APL

GYFTA

A stranded loose-tube design with a GFRP central strength member and APL armor. Use it when the strength member should be non-metallic but an aluminum-polyethylene barrier is acceptable.

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GYFTS GFRP central strength member PSP armored cable

GFRP + PSP

GYFTS

A GFRP-centered stranded loose-tube cable with PSP armor. Consider it where stronger radial protection is required while avoiding a metallic central strength member; the cable still contains metallic armor.

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GYFTY GFRP central strength member stranded loose tube fiber cable

NON-ARMORED GFRP

GYFTY

A GFRP-centered stranded loose-tube design without named metallic armor. Consider it for protected ducts with moderate mechanical risk; confirm whether every component is non-metallic.

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GYFTY73-2 anti rodent anti bird FRP tape double sheath fiber cable

FRP TAPE + DOUBLE SHEATH

GYFTY73-2

A stranded loose-tube cable with FRP tape and double sheath for anti-rodent and anti-bird protection. Match the barrier to the local pest severity and confirm duct fill.

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GYFXY FRP rods unitube optical fiber cable

UNITUBE + FRP RODS

GYFXY

A compact uni-tube cable reinforced with FRP rods. Consider it for lower-count protected duct routes where small diameter is useful; verify pulling load, bend radius and crush resistance.

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GYFY all dielectric GFRP stranded loose tube optical fiber cable

ALL-DIELECTRIC

GYFY

An all-dielectric stranded loose-tube cable with a GFRP central strength member. Use it when metallic components are not permitted; confirm radial protection and rodent requirements separately.

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GYFY semi dry all dielectric stranded loose tube optical fiber cable

SEMI-DRY DIELECTRIC

GYFY Semi-Dry

A semi-dry all-dielectric stranded loose-tube construction. Consider it when non-metallic design and cleaner cable preparation are both required; verify water penetration and pulling performance.

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GYFY63 anti rodent glass yarn double sheath all dielectric fiber cable

GLASS YARN + DOUBLE SHEATH

GYFY63

An all-dielectric double-sheath cable with glass-yarn anti-rodent protection. Use it where metallic armor is prohibited but pest risk remains; confirm the severity and test requirement.

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GYTA-1 APL armored stranded loose tube optical fiber cable

APL ARMOR

GYTA-1

An APL-armored stranded loose-tube cable for conventional duct networks. Confirm the metallic central member, fiber count, cable diameter and permitted pulling tension.

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GYTS-1 PSP armored stranded loose tube optical fiber cable

PSP ARMOR

GYTS-1

A PSP-armored stranded loose-tube cable for routes needing metallic radial protection. Confirm duct condition, crush exposure, pulling load and bonding requirements.

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GYTY non armored stranded loose tube optical fiber cable

NON-ARMORED STRANDED

GYTY

A non-armored stranded loose-tube cable for protected conduit with lower mechanical risk. It can reduce diameter and weight, but does not provide the radial barrier of APL or PSP armor.

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GYXTW PSP armored central tube optical fiber cable

CENTRAL TUBE + PSP

GYXTW

A compact central-tube design with PSP armor. Consider it for lower-count duct routes needing radial protection; verify steel-wire elements, diameter and bend radius.

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GYXY non armored central tube optical fiber cable

NON-ARMORED CENTRAL TUBE

GYXY

A compact non-armored central-tube cable for well-protected duct routes. Use it where low diameter is more important than armor; confirm pulling and crush limits.

View Product Details →

How Do I Choose a Duct Fiber Optic Cable?

Choose the installation method and route hazards first. The cable must fit the duct and survive pulling, bending, water and radial loads without adding armor or materials that the route does not need.

Pulling or blowing?

For pulling, specify duct length, bends, pulling equipment, lubricant and maximum tension. For air installation, confirm that the exact cable has the diameter, mass, stiffness and surface design required by the blowing system.

Central or stranded tube?

Central-tube cables are compact and suit lower-count routes. Stranded loose-tube cables provide more capacity and structural flexibility; compare diameter, mass, access method and fiber count.

APL, PSP or no armor?

Use non-armored cable in protected ducts with controlled pulling and low radial risk. APL adds a metallic moisture barrier, while PSP is considered for stronger radial protection; both require review of metallic bonding and lightning exposure.

Wet duct?

Specify continuous or intermittent water exposure, duct drainage and entry sealing. Choose gel-filled, semi-dry or dry water blocking only after confirming the completed cable's water-penetration requirement.

Metal-free route?

Choose an explicitly all-dielectric design such as GYFY when metallic components are prohibited. A GFRP central member alone does not make a cable all-dielectric if APL or PSP armor is still present.

Rodents or birds?

Use a verified barrier such as FRP tape or glass yarn with double sheath when the route assessment identifies pest risk. Match the protection method to the local species and severity.

Quick Comparison by Construction Family

Use these families to narrow the range, then compare the exact product data sheets for fiber count, outer diameter, mass, tensile load, crush, bend radius and water penetration.

Family	Typical Models	Protection	Best Starting Point	Main Boundary
Central tube	GYXY, GYXTW, GYFXY	None, PSP or FRP rods	Compact lower-count duct routes	Confirm fiber capacity and pulling load
APL armored	GYFA, GYFTA, GYTA-1	Aluminum-polyethylene laminate	Metallic moisture barrier with moderate protection	Not all-dielectric
PSP armored	GYFS, GYFTS, GYTS-1, GYXTW	Steel-polyethylene laminate	Higher radial crush exposure	Metallic bonding and diameter
All-dielectric	GYFY, GYFY Semi-Dry, GYFY63	GFRP and optional glass yarn	Routes prohibiting metallic components	Specify radial and pest protection
Semi-dry	GYFS Semi-Dry, GYFY Semi-Dry	Swellable materials with reduced gel	Cleaner cable preparation	Verify completed water test
Pest resistant	GYFTY73-2, GYFY63	FRP tape or glass yarn, double sheath	Rodent or bird exposure	Match protection to local severity

Where Do Duct Fiber Optic Cables Fit?

They fit underground conduit routes where the duct provides much of the external mechanical protection. They should not be treated as direct-buried, aerial or continuously flexing cable unless the exact construction is approved for that use.

Metro and backbone ducts

Use stranded loose-tube cable where higher fiber counts and route growth are priorities. Check duct occupancy, pulling sections, closures and future access.

Access networks

Compact central-tube or light-armored drop constructions can suit shorter access sections. Confirm the transition from feeder duct to building or outdoor termination.

Wet or flooded ducts

Use an outdoor PE-sheathed cable with verified longitudinal water blocking, and address duct drainage and entry seals. Water blocking does not correct a failed conduit system.

High pest pressure

Select a construction with a supported rodent or bird barrier. Do not assume that every armored cable provides the same pest resistance.

Not direct burial by default

A duct cable relies on conduit protection. Use it in direct soil contact only when the exact construction and data sheet explicitly permit direct burial for the route conditions.

Frequently Asked Questions

What is duct fiber optic cable?

It is an outdoor fiber cable designed for installation inside conduit. The duct supplies much of the external protection, while the cable provides the required pulling strength, water blocking and optical performance.

What is the difference between duct and direct-buried cable?

Duct cable relies on conduit for much of its mechanical protection. Direct-buried cable contacts the soil and normally needs greater crush, impact, water and pest protection.

Can duct cable be directly buried?

Only when the selected construction is explicitly approved for direct burial and meets the route's crush, impact, water, sheath and pest requirements.

What is the difference between APL and PSP armor?

APL uses an aluminum-polyethylene laminate and primarily adds a metallic moisture barrier with moderate protection. PSP uses a steel-polyethylene laminate and is considered when stronger radial protection is needed; both make the cable metallic.

How do I select cable for a wet duct?

Specify the water exposure and choose a suitable outdoor sheath plus verified longitudinal water blocking. Gel-filled and semi-dry designs differ in preparation, but both must meet the completed cable water test.

Does a GFRP strength member make the cable all-dielectric?

Not by itself. A cable with a GFRP central strength member can still contain APL or PSP metallic armor; choose a model explicitly described as all-dielectric when metal-free construction is required.

RFQ Checklist

Provide the route and installation information below so the supplier can return a suitable construction and count-specific data sheet.

Route length, duct inner diameter, occupancy and material
Pulling, blowing or manual installation method and equipment
Longest pulling section, number and radius of bends, and access points
Fiber type, fiber count, attenuation and spare-capacity target
Maximum cable diameter, mass, pulling tension, crush and bend radius
Water exposure, drainage, temperature and UV exposure at entries
Required APL, PSP, all-dielectric or non-armored construction
Rodent, bird, lightning and metallic bonding restrictions
Gel-filled, semi-dry or dry preparation preference
Applicable standards, water test, marking and test reports
Drum length, quantity, packaging and delivery destination
Any mixed-route sections that require a different cable type

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