Why Two Fiber Optic Cable Quotations Can Differ by 20–30% Even With the Same Fiber Count

A buyer sends the same RFQ to three suppliers:

24-core G.652.D outdoor fiber optic cable, 50 km.

The quotations come back with a 20–30% price gap.

At first, that seems difficult to explain. All three offers say 24F. All use G.652.D fiber. Why should one cable cost so much more?

Because fiber count describes only one part of the cable.

Two 24-core cables can use different jackets, armor, strength members, water-blocking materials, cable diameters, mechanical specifications, test requirements and drum lengths.

For buyers comparing fiber optic cable quotations, the first question should therefore be:

Are these suppliers actually quoting the same cable?

Very often, they are not.

Same Fiber Count Does Not Mean the Same Cable

Consider this RFQ:

It looks clear, but several important details are missing:

• duct, direct burial or aerial installation;
• armor structure;
• jacket material and thickness;
• steel or FRP strength member;
• water-blocking design;
• tensile and crush requirements;
• cable diameter and weight;
• drum length;
• testing and documentation.

Each supplier has to fill in those blanks.

Supplier A may assume the cable will be installed inside an underground duct and quote a duct and aerial fiber optic cable.

Supplier B may assume direct burial and quote an armored direct buried fiber optic cable.

Both commercial descriptions may still say:

24 Core G.652.D Outdoor Fiber Optic Cable

But Supplier B is putting more protective material into every kilometer.

The same issue appears with aerial cable. A 48F ADSS cable designed for a short span does not necessarily use the same reinforcement as a 48F cable intended for a much longer span.

The fiber count stays the same. The cable construction does not.

Where Can a 20–30% Price Difference Come From?

A large quotation gap is rarely caused by one item alone. Several specification differences usually accumulate.

The example below uses a normalized price index to show the comparison logic. It is not a current market price.

Quotation B is 26% higher.

But the extra cost is not coming from the 24 fibers. It comes from the materials and performance built around them.

This is why procurement teams should compare:

the same approved cable specification against the same approved cable specification

rather than simply:

24F against 24F.

Six Specification Areas That Commonly Change the Price

1. Optical Fiber Requirements

“G.652.D” is an important specification, but it does not describe the entire acceptance requirement.

Buyers may also need to confirm:

• attenuation limits;
• operating wavelengths used for acceptance;
• fiber geometry or coating requirements;
• approved fiber source, where required;
• batch traceability;
• optical test records.

ITU-T G.652 defines characteristics for single-mode optical fiber and cable, but project specifications may add their own acceptance criteria.

A familiar fiber brand alone should not determine the purchasing decision. The offered fiber needs to meet the agreed technical requirement.

The same applies when comparing G.652.D with G.657.A1 or G.657.A2. These should not be treated as interchangeable without checking the network design.

2. Jacket Material and Thickness

Two quotations may both say black PE jacket, while using different amounts of polymer per kilometer.

The difference may come from:

• cable outside diameter;
• nominal sheath thickness;
• minimum sheath thickness;
• single or double jacket construction;
• required jacket compound.

Across 50 or 100 km, even a modest difference in material consumption becomes commercially meaningful.

More jacket material is not automatically better. It only adds value when the project actually needs the additional mechanical or environmental protection.

3. Armor

Armor can change a quotation quickly.

Depending on the installation, a cable may use:

• no metallic armor;
• aluminum tape;
• corrugated steel tape;
• steel wire;
• multiple protective layers.

A direct-buried cable usually needs different protection from a cable installed inside a protected duct.

Additional armor changes cable weight, outside diameter, crush performance, bending characteristics and shipping weight.

This is why the phrase “underground fiber optic cable” is not specific enough.

The RFQ should state whether the cable is installed in duct or direct buried.

4. Strength Members

This is especially important when buying ADSS fiber optic cable.

A useful ADSS RFQ should include:

• average span;
• maximum span;
• wind conditions;
• ice loading where relevant;
• required tensile performance;
• installation environment;
• jacket requirement.

A longer span can require more reinforcement, particularly aramid yarn, which changes cable diameter, weight and cost.

Two quotations that both say 48F ADSS may therefore describe different mechanical designs.

For aerial projects, the ADSS cable specification guide can help identify the information that should be confirmed before quotation.

5. Water Blocking

Water-blocking components are mostly hidden inside the cable.

Depending on the design, manufacturers may use:

• filling compound;
• water-blocking yarn;
• water-blocking tape;
• combinations of these materials.

Two cables may look almost identical externally while having different internal structures.

A cable cross-section is therefore useful when reviewing quotations. It allows the buyer to see how the manufacturer intends to protect the cable against water migration.

6. Cable Diameter, Weight and Drum Length

Outside diameter and cable weight are useful cross-checks.

If two suppliers claim to offer the same armor, strength member and jacket construction but one cable is significantly lighter, the technical team should ask why.

The answer may be perfectly reasonable, but the numbers should make physical sense.

Drum length also affects the quotation.

A 40 km order supplied as:

10 drums × 4 km

is commercially different from:

20 drums × 2 km.

More drums mean more packaging and handling. Shorter lengths may still be necessary for certain routes, so delivery length should be defined before suppliers quote.

Testing Scope Can Also Change the Price

RFQs sometimes contain one vague sentence:

“Cable must comply with IEC standards.”

That is not enough for a clean commercial comparison.

The IEC 60794 series covers requirements and test procedures for optical fiber cables, including mechanical and environmental performance.

Buyers should separate three types of testing.

Routine Production Inspection

Depending on the agreed purchase specification, routine checks may include:

• fiber continuity;
• attenuation;
• cable dimensions;
• cable length;
• marking;
• visual inspection.

Project or Lot Acceptance Testing

Some customers require additional inspection or documentation for a specific order or production lot.

If one supplier includes that work and another does not, the quotation scope is different.

Qualification or Type-Test Evidence

Mechanical and environmental performance may be supported by existing type-test or qualification reports.

It is not always necessary to repeat every destructive or long-duration test on each shipping drum.

A better RFQ therefore asks:

Which tests will be carried out on this order?

and:

Which qualification reports are available for this cable design?

That is more useful than simply asking whether the cable is “IEC compliant.”

How to Put Every Supplier on the Same RFQ Baseline

A better quotation starts with a better RFQ.

Instead of:

Please quote 24F G.652.D outdoor cable.

provide enough information for every supplier to price the same requirement.

For ADSS projects, add span and route conditions.

For underground projects, clearly state duct or direct burial and the required armor.

For FTTX drop cable, confirm indoor/outdoor use, strength members and jacket requirements.

Review the Datasheet Before Sorting by Price

1. Confirm the Application

Are all suppliers designing for the same installation environment?

2. Compare the Cable Cross-Section

Check tubes, armor, strength members, water blocking and jacket layers.

3. Compare OD and Weight

Large differences often reveal different material consumption or construction.

4. Compare Optical Requirements

Confirm fiber category and acceptance values.

5. Compare Mechanical Performance

Check tensile, crush and bending requirements. For ADSS, compare span-related design values.

6. Compare Testing and Documents

Make sure all suppliers have priced the same inspection and documentation scope.

7. Compare Drum Length and Packing

A 2 km drum and a 4 km drum are not commercially identical.

8. Compare Incoterms

Do not compare an EXW price directly with CIF without separating freight and export costs.

9. Compare Price

Only now does the unit price become a reliable procurement metric.

Use “Price per Compliant Kilometer”

The lowest USD/km is not always the lowest project cost.

A cheaper cable that does not meet installation conditions can create problems during pulling, splicing, operation or later maintenance.

But over-specification also wastes budget.

A heavy armored cable designed for direct burial may make little sense inside a protected duct.

Good procurement avoids both:

Under-specification: something the project needs has been removed to reduce price.

Over-specification: the project pays for materials or performance it does not need.

A better commercial metric is:

Price per kilometer of cable that meets the approved project specification.

That puts technical compliance and price on the same line.

Fiber Optic Cable Quotation Checklist

Before approving a supplier, confirm:

• same installation environment;
• same fiber specification;
• comparable cable structure;
• same jacket and armor requirement;
• comparable strength members;
• defined water-blocking structure;
• reasonable OD and cable weight;
• matching tensile and crush performance;
• same ADSS span conditions where applicable;
• clearly defined testing scope;
• same drum length and packing basis;
• same Incoterm;
• required technical documents included.

If several of these items are still unclear, the quotations are not ready for final price comparison.

FAQ

Why can two 24-core fiber optic cables have different prices?

Because 24F only describes fiber count. Armor, jacket, strength members, cable dimensions, mechanical performance, testing and packaging can all differ.

Why can two ADSS quotations differ with the same fiber count?

ADSS design depends on span and route conditions. Different tensile requirements can require different amounts of reinforcement.

Does a heavier cable mean better quality?

No. It means the construction contains more or different material. Whether that is useful depends on the installation.

What is the best way to compare fiber optic cable prices?

Send every supplier the same detailed RFQ, compare the returned technical datasheets first, and compare unit price only after the specifications and commercial terms are aligned.

Compare the Cable Before You Compare the Price

A 20–30% quotation difference does not automatically mean one supplier is expensive or another is cutting quality.

Often, the suppliers are pricing different assumptions.

One may be quoting a duct cable. Another may be quoting an armored direct-buried design. A third may have included more reinforcement, additional documentation or shorter drum lengths.

The product names can still look nearly identical.

Before negotiating price, put every supplier on the same baseline:

same installation method, same fiber requirement, same cable structure, same mechanical performance, same testing scope, same drum length and same commercial term.

Then compare the number at the bottom.

Preparing a Fiber Optic Cable RFQ?

Send SOCTFiber your installation method, fiber count, fiber type, route conditions, mechanical requirements, drum length and required quantity.

SOCTFiber can review the application and recommend an appropriate cable structure before quotation, helping your purchasing and technical teams compare the offer against the actual project requirement.