24-Core ADSS Cable for a Rural Broadband Network in the Philippines

In May 2026, SOCT prepared approximately 40 km of 24-core double-sheath ADSS fiber optic cable for a rural broadband project in the Philippines.

The telecommunications engineering contractor planned to build an aerial fiber route of approximately 38 km using existing utility poles across villages, roadside corridors and agricultural areas.

The customer’s main objective was not simply to increase fiber capacity. It needed an aerial cable system that could provide better mechanical stability across uneven pole spans, frequent rainfall, high humidity and exposed outdoor sections.

After reviewing the planned route conditions, SOCT recommended a 24-core double-sheath ADSS cable designed for spans of up to 200 meters. The proposed supply package also included matched suspension hardware, dead-end fittings and outdoor fiber splice protection.

The cable structure, maximum span, installation fittings, drum lengths and quality records were coordinated as one project-specific supply package rather than treated as separate purchases.

Project Overview

Project Background

The contractor was extending broadband connectivity to rural communities where underground duct construction would have required additional excavation, civil works and project time.

Using existing utility poles offered a more practical deployment route. However, the pole spacing and environmental conditions were not consistent across the complete network.

Village sections generally had shorter distances between poles, while open agricultural and roadside sections included longer exposed spans. The route also needed to withstand frequent rainfall, high humidity and year-round outdoor exposure.

The customer initially requested a 24-core ADSS cable. Before confirming the product, SOCT reviewed the following project information:

• Required fiber count;
• Planned route length;
• Average and maximum pole span;
• Installation method;
• Environmental exposure;
• Required cable reserve;
• Expected splice locations;
• Suspension and dead-end hardware requirements;
• Preferred drum lengths and packaging.

This review showed that fiber count alone was not enough to determine the correct cable structure.

Main Engineering Challenges

Uneven Pole Spacing

Rural utility pole routes are rarely built with perfectly consistent distances between poles.

Some sections of the planned Philippine route had conventional village pole spacing, while open roadside and agricultural sections required the cable to cover longer spans.

Using a short-span ADSS cable throughout the route could have increased the risk of excessive sag, cable movement or mechanical stress in the exposed sections.

Using an unnecessarily heavy cable would also have increased pole loading, transportation weight and material cost.

The selected cable therefore needed to balance tensile capability, cable weight, sag control and installation practicality.

Rainfall and High Humidity

The cable would remain outdoors throughout its service life. The humid tropical environment increased the importance of water blocking, sheath integrity and reliable cable-end sealing.

The proposed cable needed to withstand:

• Frequent rainfall;
• High relative humidity;
• Temperature changes;
• Long-term sunlight exposure;
• Handling during aerial installation;
• Movement caused by wind and cable vibration.

A double-sheath structure was selected to provide additional environmental and mechanical protection for the more exposed parts of the route.

Cable and Fitting Compatibility

ADSS cable performance depends on more than the cable itself.

Suspension clamps and dead-end assemblies must match the cable diameter, span range, working tension and installation position. An unsuitable fitting can create excessive compression, concentrated stress, uncontrolled cable movement or sheath damage.

The contractor therefore wanted the cable and its main installation hardware to be reviewed as one coordinated system.

Drum Length and Splice Planning

Supplying every cable drum in one standard length can create unnecessary field joints or leave unsuitable cable lengths at the end of a construction section.

The contractor’s planned route length was approximately 38 km, while the ordered cable quantity was approximately 40 km.

The additional cable allowance covered:

• Cable sag between poles;
• Reserve cable at joint locations;
• Routing around pole hardware;
• Splicing and termination preparation;
• Installation tolerance;
• Emergency project reserve.

Drum lengths were planned against the intended installation sections so the field team could allocate each drum to a defined part of the route.

Recommended ADSS Cable Configuration

Based on the project requirements, SOCT recommended a 24-core double-sheath ADSS fiber optic cable designed for spans up to 200 meters.

The selected cable structure included:

• 24 G.652.D single-mode optical fibers;
• PBT loose tubes;
• A non-metallic FRP central strength member;
• Water-blocking materials;
• An inner protective sheath;
• Aramid yarn tensile elements;
• An outer weather-resistant sheath;
• A fully non-metallic self-supporting design.

This configuration allowed one cable design to be used across the conventional village sections and the longer exposed spans of the planned route.

Why 24 Fiber Cores Were Selected

The network did not need to activate every optical fiber during the initial construction stage.

The 24-core configuration provided capacity for:

• Current backbone transmission;
• Connections to village access nodes;
• Future broadband expansion;
• Network protection routes;
• Maintenance reserve;
• Emergency fiber restoration.

Installing spare fibers during the first construction phase is generally more practical than adding another aerial backbone cable after the pole route has entered service.

The selected G.652.D single-mode fiber also maintained compatibility with standard single-mode splicing, optical testing and transmission equipment commonly used in access and backbone networks.

Why a Double-Sheath ADSS Cable Was Used

A single-sheath ADSS cable can be suitable for shorter spans and moderate outdoor environments.

For this project, the combination of rainfall, humidity, exposed outdoor sections and variable pole spans justified the additional protection of a double-sheath structure.

The inner sheath helped protect and stabilize the internal cable elements. Aramid yarn provided the tensile strength required for self-supporting aerial installation, while the outer sheath added protection against weather exposure and handling during installation.

The double-sheath design was not selected simply because it represented a higher product specification. It was selected because it matched the actual route conditions and the customer’s objective of improving long-term aerial line stability.

Why the All-Dielectric Structure Was Important

The selected ADSS cable contained no metallic messenger wire.

It could support itself between utility poles without requiring the contractor to install a separate steel support strand. The non-metallic structure also avoided grounding requirements associated with metallic cable elements.

For this rural broadband route, the all-dielectric structure offered several practical benefits:

• No separate messenger wire installation;
• Fewer supporting components;
• A simpler aerial cable layout;
• Lower risk of electrical interference;
• Easier coordination with existing utility pole routes.

Matching the ADSS Cable with the Correct Fittings

SOCT reviewed the selected cable diameter, intended span range and planned pole positions when preparing the main fitting recommendation.

The proposed hardware package included:

• Suspension clamps for straight intermediate poles;
• Dead-end tension assemblies for terminal poles;
• Dead-end assemblies for major direction changes;
• Pole brackets and connecting hardware;
• Outdoor splice closures for cable joint locations.

The selection followed the principles described in SOCT’s ADSS cable installation and fittings solution.

Suspension clamps were selected for positions where the cable needed to be supported without excessive compression.

Dead-end assemblies were specified at terminal poles, major route changes and designated tension sections where the cable load needed to be securely transferred to the pole structure.

Coordinating the cable and fittings reduced the risk of purchasing hardware that did not match the cable diameter or mechanical requirements.

Project-Specific Drum Planning

Before production, the planned installation sections and expected splice locations were reviewed.

Instead of relying only on one standard commercial drum length, the cable allocation considered:

• Distance between splice locations;
• Additional cable required for sag;
• Reserve cable at poles and joints;
• Splicing preparation allowance;
• Transportation restrictions;
• On-site cable handling equipment;
• Emergency reserve requirements.

This planning allowed each wooden drum to be assigned to a defined section of the route.

It also reduced the likelihood of creating additional field joints simply because the supplied cable lengths did not match the contractor’s construction sequence.

Production and Quality Control

After the cable structure, quantity, drum plan and fitting requirements were confirmed, SOCT prepared the order for production.

Quality control covered the optical, structural, identification and packaging requirements of the cable.

Material Verification

The production team checked the main cable materials, including:

• Optical fiber;
• PBT loose tubes;
• FRP strength member;
• Aramid yarn;
• Water-blocking materials;
• Inner and outer sheath compounds.

Cable Structure Inspection

During production, the inspection process covered:

• Fiber and loose-tube arrangement;
• Cable outside diameter;
• Sheath appearance;
• Sheath thickness;
• Cable surface condition;
• Meter marking;
• Customer-required cable printing;
• Finished cable length.

Optical Testing

The finished cable drums were tested at standard single-mode wavelengths.

The optical inspection covered:

• Fiber continuity;
• Optical attenuation;
• Identification of each fiber;
• Drum-specific test records.

Preparing test records for each cable drum allowed the contractor to match the factory test information with the physical drum during receiving inspection and field installation.

Packaging Inspection

Each cable length was wound onto an export wooden drum.

The cable ends were sealed to reduce the risk of moisture entering the cable during transportation and storage.

The drum marking included:

• Cable model;
• Fiber count;
• Drum number;
• Cable length;
• Gross weight;
• Net weight;
• Direction of rolling.

The drum identification made it possible to match the physical cable with the packing list and corresponding optical test record.

Customer Review and Pre-Shipment Acceptance

Before the shipment was released, the contractor reviewed the confirmed cable specification, drum schedule, cable printing and packing information.

SOCT completed optical continuity and attenuation testing for the finished cable drums. Drum-specific identification and test records were prepared to support the customer’s receiving inspection and subsequent field testing.

The pre-shipment review covered:

• Confirmed cable structure;
• 24-core G.652.D fiber configuration;
• Maximum design span;
• Total cable quantity;
• Individual drum lengths;
• Cable printing and meter marking;
• Drum identification;
• Optical test records;
• Export packing details.

The shipment was released after the cable configuration, lengths, markings and packaging information had been checked against the approved order requirements.

This acceptance process focused on information that could be documented before shipment. No unsupported claim about long-term field operation or network failure rates is included in this project case.

Outdoor Fiber Splice Protection

Outdoor cable joints required protection against moisture, dust, physical handling and long-term environmental exposure.

A 48-core outdoor dome fiber optic splice closure was proposed for the 24-core ADSS cable joint locations.

The additional closure capacity provided sufficient internal space for:

• Fiber splicing;
• Organized fiber routing;
• Fiber storage;
• Future branching;
• Additional network capacity.

Selecting a closure with more capacity than the initial active fiber count also made internal fiber management easier for the installation team.

Installation Support

The telecommunications contractor was responsible for pole inspection, field installation, cable splicing and final route testing.

SOCT’s role covered product supply and cable-related technical support.

The installation guidance included:

• Minimum cable bending radius;
• Recommended unreeling direction;
• Cable handling precautions;
• Suspension point selection;
• Dead-end point selection;
• Clamp positioning;
• Cable reserve at joint locations;
• Protection of cable ends;
• Matching drum numbers with test records.

This division of responsibility ensured that SOCT’s role remained focused on cable configuration, manufacturing, testing, fitting compatibility and supply support.

Project Outcome

The main project value did not come from one isolated cable specification.

It came from coordinating the cable structure, maximum span, fitting compatibility, splice protection, drum planning and quality documentation as one complete supply package.

The project showed that improving rural aerial network stability begins before the cable is installed.

It requires complete route information, an appropriate cable design and coordinated selection of the cable, fittings, splice protection and packaging.

Information Required for an ADSS Rural Broadband Project

To prepare an accurate ADSS cable recommendation, buyers should provide:

• Total route length;
• Required fiber count;
• Average pole span;
• Maximum pole span;
• Pole type and condition;
• Major route direction changes;
• Local wind conditions;
• Rainfall and humidity conditions;
• Required installation position;
• Preferred sheath structure;
• Planned splice locations;
• Preferred cable drum length;
• Required suspension and dead-end fittings.

A request that only states “24-core ADSS cable” is not sufficient to confirm the correct mechanical design.

Complete route information allows the cable manufacturer to match the span, tensile strength, sheath structure, cable diameter and installation fittings more accurately.

Frequently Asked Questions

Why was a 200 m ADSS cable selected for a route with different pole spans?

The route included shorter village sections and longer exposed spans. Selecting a cable designed for spans up to 200 meters provided one consistent specification while covering the longest planned sections.

Why was approximately 40 km of cable supplied for a 38 km route?

The additional cable quantity allowed for sag between poles, routing around pole hardware, reserve cable at splice points, termination preparation, installation tolerance and emergency project reserve.

Is double-sheath ADSS cable required for every rural broadband project?

No. A single-sheath design may be suitable for shorter spans and moderate environments. Double-sheath cable is more appropriate when the route includes longer spans, exposed sections or additional mechanical and environmental risks.

Can the cable drum lengths be customized?

Yes. Drum lengths can be planned around installation sections, splice locations, transportation restrictions and the customer’s cable handling equipment.

How was the cable checked before shipment?

The pre-shipment review covered the confirmed cable structure, fiber configuration, drum lengths, printing, meter marking, optical test records and export packing details.

Should ADSS fittings be ordered together with the cable?

The fittings may be purchased separately, but they must match the cable diameter, span and working tension. Coordinated cable and fitting selection can reduce compatibility risks.

What is the most important parameter when selecting ADSS cable?

There is no single deciding parameter. Fiber count, maximum span, wind conditions, sag, tensile requirements, sheath structure and fitting compatibility must be evaluated together.

Planning an ADSS Rural Broadband Network?

Send SOCT your route length, required fiber count, average span, maximum span, local environmental conditions and required installation fittings.

SOCT can support ADSS cable configuration, optical fiber selection, fitting matching, production testing, drum planning, export packaging and project delivery.

Contact SOCT Fiber for Order & Project Support