| Fiber type and reach | Single-mode or multimode fiber, application, link distance, and supported transceiver interface. | Specify the required fiber category, such as OS2 for single-mode or OM4 for multimode, based on the optical link design. | The fiber and transceiver must be compatible with the planned reach, wavelength, and data rate. |
| Fiber count and connector format | Number of fibers, MPO/MTP-style interface format, connector gender, and equipment port requirements. | Common configurations include 8, 12, 16, or 24 fibers. Confirm the exact interface and fiber arrangement at both ends. | A fiber-count or interface mismatch can prevent connection or leave fibers unused. |
| Polarity and pin configuration | System polarity method, key orientation, and whether each connector end is pinned or unpinned. | Document the polarity required by the equipment and cabling design; confirm compatibility across trunk cables, cassettes, and patch cords. | Correct polarity maintains the intended transmit-to-receive path. Pin and polarity details must match the mating components. |
| Connector end-face type | UPC or APC end-face, as required by the optical interface and the mating connector. | Specify the same compatible end-face type throughout each mated connection; do not assume APC and UPC are interchangeable. | An incompatible end-face combination can cause poor performance or damage to connector surfaces. |
| Insertion-loss budget | Maximum permitted insertion loss per connector pair or assembly, and the measurement method. | Set the acceptance limit from the link budget. Ask the supplier to state guaranteed maximum loss rather than relying only on a typical value. | Loss accumulates across connectors and other components, reducing the optical power available to the receiver. |
| Return loss and optical performance | Applicable return-loss requirements, fiber mode, connector type, and test conditions. | Request specifications and test evidence appropriate to the selected single-mode or multimode system and connector end-face. | Defined test conditions make supplier performance claims easier to compare and verify. |
| Cable length and routing | Measured end-to-end length, routing path, slack allowance, and connector breakout length if applicable. | Provide installation drawings or measured path lengths, including rack entry, overhead or underfloor routes, and service loops. | Accurate length planning helps avoid excessive slack, tension, and installation delays. |
| Deployment environment | Indoor or outdoor use, temperature range, moisture exposure, UV exposure, and mechanical protection needs. | Choose cable construction and jacket materials that suit the actual route and site conditions; verify environmental ratings in the product documentation. | A cable intended for one environment may not be suitable for another, especially where moisture, sunlight, or physical stress is present. |
| Fire and building-code requirements | Required cable flame rating or low-smoke specification for the installation location and local regulations. | Confirm whether the route requires a plenum, riser, general-purpose, or low-smoke cable classification under applicable codes. | Fire-rating requirements vary by building and jurisdiction; confirm the exact approved classification before ordering. |
| Bend radius and pulling limits | Minimum bend radius, maximum tensile load, crush resistance, and installation method. | Request cable-specific handling limits and follow the manufacturer’s guidance during pulling, routing, and storage. | Excessive bending or pulling force can increase attenuation or damage the cable assembly. |
| Factory testing and documentation | Test coverage, acceptance criteria, polarity verification, labeling, and serialized test reports. | Request documented insertion-loss results for each assembly and confirmation of continuity, fiber mapping, and polarity against the approved design. | Traceable results support incoming inspection, troubleshooting, and future maintenance. |
| Manufacturing consistency and delivery | Sample approval process, production controls, packaging, lead time, order quantities, and change management. | Ask how the supplier controls connector assembly, inspection, labeling, and repeat orders; verify delivery dates against the deployment schedule. | Consistent production and clear logistics reduce variation between batches and help keep installation on schedule. |