A structured checklist for defining optical performance, cable construction, mechanical and environmental tests, manufacturing tolerances, factory documents, inspection, packing, acceptance criteria, and supplier deviations.
Published 2026-06-21 · MapleArashi Technical Insights
A basic request for quotation may state the cable type, fiber count, quantity, and delivery destination. That may be sufficient for a preliminary budget, but it is not sufficient for a controlled telecom procurement.
A technical specification defines exactly what must be manufactured, how compliance will be demonstrated, which tests apply, what documents must be supplied, how deviations must be declared, and what conditions will cause rejection. Without these controls, two suppliers can quote cables with the same model name but substantially different materials, dimensions, mechanical performance, test scope, and service life.
The specification must begin with the installation environment. Cable structure cannot be selected correctly from fiber count alone.
| Specification Field | Information to State | Procurement Risk if Omitted |
|---|---|---|
| Installation method | Duct, direct burial, aerial, indoor, tunnel, tray, microduct, or drop | Wrong armor, sheath, strength member, or fire performance |
| Route environment | Urban, rural, coastal, industrial, rodent-prone, lightning-prone, or high-voltage corridor | Premature sheath, corrosion, electrical, or mechanical failure |
| Temperature range | Installation, operating, storage, and transport temperatures | Uncontrolled attenuation change or material degradation |
| Required service life | Design life and expected environmental exposure | Supplier may optimize only for minimum initial compliance |
| Applicable authority | Operator specification, national standard, project specification, or tender document | Conflicting acceptance rules |
For preliminary commercial inquiries, see What to Prepare Before Requesting a Fiber Optic Cable Quote . The present checklist is intended for the formal technical specification stage.
Do not write only “single-mode fiber.” State the applicable fiber category and the optical values to be verified in the finished cable.
Values must be stated as contractual acceptance limits, not copied blindly from a generic brochure. The finished-cable attenuation report should identify drum number, fiber number, wavelength, measured length, and test method.
| Construction Element | Items to Specify |
|---|---|
| Optical unit | Central loose tube, stranded loose tube, tight buffer, ribbon, or drop-cable construction |
| Tube material | Material type, tube count, fibers per tube, filler arrangement, and color code |
| Strength member | Steel wire, FRP, aramid yarn, messenger, or combined system |
| Water blocking | Filling compound, dry water-blocking yarn/tape, or hybrid design |
| Moisture barrier | Aluminum-polyethylene laminate or other specified barrier |
| Armor | Corrugated steel tape, steel wire, double sheath, or non-metallic protection |
| Outer sheath | PE, LSZH, PVC, or project-defined compound; nominal and minimum thickness |
| Ripcord | Quantity, position, strength, and accessibility |
| Identification | Tube colors, fiber colors, meter marking, model, customer name, drum number, and date |
Examples of project-specific structures include GYTS steel-tape armored duct cable, GYTA53 double-sheath direct-buried cable, GYFTY non-metallic outdoor cable, ADSS aerial cable, and FTTH drop cable.
Mechanical values must be connected to a named test method and an acceptance criterion. Avoid accepting a table containing unexplained numbers such as “tension: 1,500 N” without stating whether the value is short-term, long-term, installation, operating, or test load.
| Property | Specification Should Define | Acceptance Evidence |
|---|---|---|
| Tensile performance | Load, duration, sample length, attenuation-change limit, fiber-strain limit, and residual damage criteria | Test report using the specified IEC 60794 method or approved equivalent |
| Crush resistance | Applied force, plate dimensions, duration, attenuation limit, and post-test inspection | Mechanical test report |
| Impact resistance | Impact energy, number of impacts, impact location, and pass/fail condition | Impact test report |
| Repeated bending | Bending radius, load, cycles, attenuation change, and visible damage limit | Repeated-bending report |
| Torsion | Gauge length, angle, cycles, tension, and acceptance limit | Torsion test report |
| Minimum bend radius | Installation and operating bend-radius limits | Datasheet and installation instructions |
A specification should distinguish nominal values from contractual limits. State which dimensions are informative and which are subject to rejection.
Diameter and weight affect duct occupancy, pulling load, blowing performance, pole loading, freight cost, drum size, and installation equipment. They are not merely catalogue data.
| Item | Requirement to Define |
|---|---|
| Sheath marking | Manufacturer, customer, cable model, fiber count, year, meter marks, standard, and project code |
| Marking durability | Legibility, permanence, spacing, and resistance to handling |
| Standard drum length | Required length, tolerance, and approval process for short drums |
| Drum construction | Wooden or steel drum, flange size, barrel size, treatment, and loading direction |
| Cable ends | Sealing, accessibility, minimum free end, and test-lead requirements |
| Drum label | Model, length, gross/net weight, dimensions, drum number, production date, and destination |
| Packing protection | Lagging, waterproof protection, wrapping, lifting points, and container securing |
The contract should list all documents that must accompany the offer, production approval, inspection, shipment, and final acceptance.
| Stage | Buyer Control |
|---|---|
| Bid evaluation | Review compliance statement, deviations, construction, standards, test evidence, and exclusions |
| Pre-production approval | Approve datasheet, drawing, marking, drum length, materials, and inspection plan |
| In-process inspection | Verify materials, color code, tube arrangement, armor, sheath, dimensions, and traceability |
| Factory acceptance test | Witness agreed routine or sample tests and review calibrated equipment records |
| Final inspection | Check cable dimensions, marking, drum condition, drum length, labels, sealing, and documents |
| Incoming inspection | Verify shipment condition, drum identity, continuity, attenuation, and visible damage |
The purchase order should state sample size, witness rights, notice period, retest rules, rejection procedure, corrective action, replacement responsibility, and the precedence of documents when the datasheet and tender specification conflict.
A supplier should not respond only with “complied.” Require every deviation, exception, alternative material, different test method, tolerance, and exclusion to be listed in a separate deviation schedule.
Silence must not automatically be interpreted as compliance. The tender should state how unlisted deviations will be treated contractually.
| Field | Buyer Requirement | Supplier Offer | Deviation |
|---|---|---|---|
| Application and installation method | To be completed | ||
| Cable model and construction | To be completed | ||
| Fiber category and manufacturer | To be completed | ||
| Fiber count and tube arrangement | To be completed | ||
| Maximum attenuation | To be completed | ||
| Tensile performance | Test method and limit required | ||
| Crush resistance | Test method and limit required | ||
| Impact resistance | Test method and limit required | ||
| Temperature cycling | Range, cycles and attenuation limit required | ||
| Water penetration | Method, duration and limit required | ||
| Cable diameter and weight | Nominal and maximum values required | ||
| Sheath material and thickness | To be completed | ||
| Armor and moisture barrier | To be completed | ||
| Standard drum length | To be completed | ||
| Marking and packing | Project-specific text required | ||
| Documents and test reports | Document list required |
These references provide a framework. The procurement document must still identify the relevant product-family standard, national requirements, operator specification, project conditions, acceptance values, and approved equivalent methods.
Send your technical specification, bill of quantities, project environment, required standards, test requirements, and inspection plan. MapleArashi can review the cable structure, identify missing parameters, and prepare a clause-by-clause technical response.
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