| Fiber Type | Single-mode fiber for outdoor radio, distributed antenna system and 5G fronthaul links. | ITU-T G.652.D | Provides low-loss transmission around the 1310 nm and 1550 nm windows and is widely used in access and mobile networks. | Essential |
| Bend Performance | Use bend-insensitive single-mode fiber where cables must pass through compact antenna brackets, cabinets or weatherproof enclosures. | ITU-T G.657.A1 or G.657.A2; verify compatibility with the network design. | Improves resistance to additional attenuation caused by tight routing and repeated installation bends. | High |
| Operating Wavelength | Support for at least 1310 nm and 1550 nm; 1490 nm and 1625 nm may be required for specific access, monitoring or coexistence systems. | Optical performance tested at the wavelengths specified by the project. | Ensures the cable remains suitable for current and future optical transmission systems. | High |
| Maximum Attenuation | Typical design targets are up to 0.35 dB/km at 1310 nm and up to 0.22 dB/km at 1550 nm for standard single-mode fiber. Confirm the product datasheet and link budget. | IEC 60793-2-50 and the applicable fiber category requirements. | Lower attenuation increases link margin and helps maintain stable optical performance over longer tower and rooftop routes. | Essential |
| Connector Interface | Choose factory-terminated connector assemblies matched to the radio and distribution equipment, such as duplex or single-fiber interfaces. | IEC 61754 connector interface standards; inspect end-face geometry and polish requirements. | Correct interface selection reduces installation time, contamination risk and field termination errors. | Essential |
| Insertion Loss | Use the project limit for the complete assembly; a lower loss target is preferred for cascaded connectors and high-density radio systems. | IEC 61300-3-34 for attenuation of installed connector sets. | Connector loss directly consumes the optical power budget and can become significant in multi-connection links. | Essential |
| Return Loss | Specify the minimum return-loss value according to the transceiver and system requirements; angled-polish interfaces are commonly selected where back-reflection control is important. | IEC 61300-3-6 for return-loss measurement. | Low back reflection supports reliable operation of sensitive optical transmitters and high-speed links. | High |
| Outdoor Temperature | For global outdoor deployment, select a tested range that covers the local climate, commonly approximately −40°C to +70°C for operation. | IEC 60794-1-2 environmental and mechanical test methods; confirm the manufacturer’s declared range. | Temperature cycling can affect cable materials, sealing systems, connector performance and optical attenuation. | Essential |
| Water Blocking | Prefer a dry-core or water-blocked construction with sealed connectors and verified longitudinal water-penetration resistance. | IEC 60794-1-2 water-penetration test methods. | Prevents moisture migration through the cable after jacket damage, connector exposure or long-term weathering. | Essential |
| UV and Weather Resistance | Use an outdoor-rated jacket designed for prolonged sunlight, rain, humidity, ozone and temperature cycling. | IEC 60794 series environmental testing; project specifications may also require regional UV-aging tests. | UV degradation can cause jacket cracking, loss of tensile protection and premature moisture ingress. | Essential |
| Mechanical Strength | Specify tensile, crush and impact ratings based on pole, tower, rooftop and aerial installation conditions. The required values must be confirmed against the cable construction and installation method. | IEC 60794-1-2 mechanical test methods. | Mechanical protection helps prevent fiber damage during pulling, lashing, routing and maintenance work. | Essential |
| Minimum Bend Radius | Verify separate values for installation and long-term operation. A common design approach is a larger installation radius and a smaller static radius after placement. | IEC 60794 cable requirements and the cable manufacturer’s declared bend-radius specification. | Respecting the bend radius limits additional attenuation and reduces the risk of permanent fiber damage. | Essential |
| Cable Diameter and Weight | Select the smallest practical diameter and weight that still meets strength, protection and connector requirements. | Project installation rules, tower loading calculations and cable-management requirements. | Lower weight simplifies tower installation, reduces wind loading and improves routing in crowded equipment areas. | High |
| Jacket Material | Use an outdoor thermoplastic jacket with documented resistance to abrasion, moisture, UV exposure and the regional temperature range. | IEC 60794 environmental and material-related requirements; regional fire rules may also apply. | The jacket is the primary barrier against weather, handling damage and chemical exposure. | High |
| Flame Performance | For indoor transitions, tunnels or equipment rooms, specify the required flame rating separately from the outdoor cable rating. | IEC 60332 series or the applicable national building and fire code. | Outdoor, indoor and riser environments may require different fire-performance classifications. | High |
| EMI and Electrical Isolation | Fiber is non-conductive and should be preferred where immunity to electromagnetic interference, lightning-related potential differences or ground loops is important. | Optical fiber provides dielectric isolation; installation must still follow local grounding and lightning-protection rules. | Electrical isolation helps protect communication links in high-power radio and tower environments. | High |
| Connector Sealing | Use outdoor connector assemblies with a verified ingress-protection rating appropriate to the installation location; IP67 or higher is commonly considered for exposed interfaces. | IEC 60529 ingress-protection classification, where applicable. | Sealed interfaces reduce failure risks caused by rain, dust, condensation and repeated maintenance exposure. | Essential |
| Fiber Count | Choose the number of fibers according to current radio links, redundancy, spare capacity and planned network expansion. | Project optical architecture and applicable cable-construction requirements under IEC 60794. | Additional spare fibers can avoid future cable replacement when radios or transport equipment are upgraded. | High |
| Identification and Traceability | Require sequential fiber identification, durable cable markings, length marks where useful and batch-level test documentation. | IEC 60794 marking and documentation practices, plus the buyer’s quality-control requirements. | Clear identification reduces commissioning time and prevents cross-connection during tower maintenance. | Medium |
| Factory Testing | Request attenuation, continuity, polarity, connector end-face inspection and insertion-loss results for every terminated assembly. | IEC 61300 test methods and project-specific acceptance criteria. | Pre-shipment testing lowers the risk of installing defective assemblies at difficult-to-access locations. | Essential |
| Documentation | Require datasheets, dimensional drawings, test reports, installation instructions, bend-radius limits and environmental ratings. | Project quality plan and applicable IEC, ITU-T and local regulatory requirements. | Complete documentation supports procurement review, installation control and future maintenance. | High |
| Global Compliance | Check the destination country’s telecom, electrical safety, environmental, import and fire requirements before purchase. | Applicable national standards, local authority requirements and project specifications. | A cable suitable for one market may require different labeling, fire performance or documentation in another market. | Essential |
