| Fiber Type and Optical Design | Single-mode fiber should normally comply with ITU-T G.652.D or G.657.A1/A2, depending on bend requirements and network design. | Fiber datasheet, attenuation curve, mode-field data, bend-radius specifications, and a sample optical test report. | Fiber type must match the network design and the requested operating wavelength. The supplier should state maximum attenuation at 1310 nm and 1550 nm. | Excessive bending loss, incompatibility with existing equipment, or unclear fiber construction. |
| Connector Compatibility | Connector interfaces should be clearly identified, such as LC, SC, MPO, or manufacturer-specific outdoor interfaces. Mating components must be mechanically and optically compatible. | Connector drawings, interface specifications, keying and polarity details, end-face inspection records, and compatibility declarations. | Connector type, gender, polarity, keying, fiber count, and boot design must exactly match the purchase order and equipment interface. | Incorrect polarity, poor mating, damaged ferrules, or non-interchangeable outdoor interfaces. |
| Insertion Loss and Return Loss | Optical performance should be stated for the complete assembly, not only for the bare fiber. Typical project limits depend on connector type, fiber count, and network budget. | 100% production test records or sample test reports using the applicable IEC 61300-3-4 insertion-loss method and IEC 61300-3-6 return-loss method. | Use the project specification as the controlling limit. For many standard connectorized assemblies, buyers commonly specify insertion loss at or below 0.50 dB per mated connection, subject to design confirmation. | Link-budget failure, intermittent service, or performance variation between production lots. |
| Environmental Protection | FTTA assemblies used outdoors should be designed for water and dust protection appropriate to the installation. IP ratings must apply to the complete mated interface where relevant. | IP test report, sealing design, cap specifications, salt-mist or corrosion information, and operating-temperature range. | The required rating should be specified by the project. IP67 means temporary immersion protection under the applicable test conditions; IP68 requires an agreed immersion depth and duration. | Water ingress, corrosion, condensation, and failures after repeated field exposure. |
| Mechanical Strength | The cable and termination should withstand installation pulling, vibration, bending, and repeated handling without exceeding optical-loss limits. | Tensile, crush, impact, bending, torsion, and repeated-flex test results based on the applicable IEC 60794 cable test methods. | Tensile load, crush load, minimum bend radius, and bend-cycle requirements must be stated numerically for both installation and permanent operation. | Fiber breakage, microbending loss, sheath damage, or termination separation during installation. |
| Cable Sheath and Fire Performance | Sheath material should suit the site environment and local fire regulations. LSZH constructions are commonly selected for areas where low smoke and halogen-free materials are required. | Material declaration, flame-retardance test report, smoke and halogen test data, UV-resistance information, and regulatory declarations. | Confirm compliance with the required IEC, EN, UL, or local fire standard. Do not treat “LSZH” as a complete performance classification without test evidence. | Non-compliance with installation regulations, excessive smoke, UV degradation, or material cracking. |
| Temperature and Climate Reliability | The complete assembly should have a declared storage, installation, and operating temperature range suitable for the deployment region. | Product environmental specification, thermal cycling report, low-temperature handling guidance, and accelerated aging data where available. | The stated range must cover actual site conditions, including seasonal extremes and installation temperature. Connector sealing performance must remain valid throughout the range. | Shrinkage, seal hardening, condensation, increased attenuation, or connector disengagement. |
| Manufacturing and Quality Control | A qualified supplier should operate documented incoming inspection, process control, end-face inspection, optical testing, traceability, and nonconformance procedures. | Quality certificate, process flow chart, control plan, calibration records, sample inspection report, and corrective-action procedure. | Require lot or serial traceability from raw materials to finished cable. Verify that test equipment is calibrated and that inspection criteria are documented. | Inconsistent batches, untraceable defects, and difficulty obtaining corrective action. |
| Customization and Engineering Support | The supplier should be able to control cable length, fiber count, connector combination, breakout design, labels, polarity, mounting hardware, and packaging. | Approved drawings, bill of materials, engineering-change procedure, sample approval record, and installation instructions. | No production change should be made without buyer approval. The final drawing must identify connector orientation, polarity, dimensions, tolerances, and labeling. | Field installation errors, incorrect cable lengths, and undocumented design changes. |
| Compliance and Export Documentation | Global buyers should receive documentation suitable for customs, project approval, and local regulatory review. | Commercial invoice, packing list, country-of-origin information, technical datasheet, declaration of conformity where applicable, and material documentation. | Product description, HS classification, quantities, weights, markings, and technical documents must be consistent across the shipment and purchase order. | Customs delays, project approval delays, or inability to demonstrate regulatory conformity. |
| Packaging and Transport Protection | Packaging should prevent connector contamination, excessive bend radius, moisture exposure, crushing, and label loss during international transport. | Packaging specification, carton test information, moisture-protection method, cable coiling diagram, and shipping inspection checklist. | Dust caps must remain installed, minimum coiling diameter must be respected, cable ends must be protected, and each package must be traceable to the inspection record. | Transit damage, contaminated end faces, mixed cable lengths, or missing identification. |
| Warranty and After-Sales Capability | The supplier should define warranty duration, claim evidence, response time, replacement policy, and technical support responsibilities before order placement. | Written warranty terms, RMA process, failure-analysis format, service contact details, and reference project documentation without confidential customer information. | Warranty terms must cover manufacturing defects and clearly distinguish installation damage from product defects. Escalation contacts should be available in the buyer’s time zone. | Slow fault resolution, disputed responsibility, and extended network downtime. |
| Supplier Evaluation Score | Use a weighted scorecard rather than price alone. A practical weighting is 30% technical quality, 20% environmental and mechanical reliability, 15% quality systems, 15% documentation, 10% delivery capability, and 10% commercial terms. | Completed supplier questionnaire, verified test reports, sample evaluation, factory audit results, and trial-order performance. | A supplier should pass all safety and compatibility requirements first, then achieve the buyer’s minimum weighted score. Any critical failure should override the total score. | Selecting the lowest quotation while overlooking compatibility, reliability, documentation, or lifecycle cost. |
