| Data rate | Common Ethernet AOC classes include 10, 25, 40, 100, 200 and 400 Gb/s. The stated rate is generally the aggregate link rate, not the rate per optical lane. | Match the cable’s rate and Ethernet application to both host ports and the network equipment. Confirm whether the rate is per direction or aggregate as specified by the supplier. |
| Host form factor | Common host interfaces include SFP+, SFP28, QSFP+, QSFP28, QSFP56, QSFP-DD and OSFP. Form factor alone does not guarantee compatibility. | Check the exact port type, supported speed, port configuration, and equipment compatibility list at each end. |
| Lane configuration | Parallel-optics examples include 40GBASE-SR4 with four 10 Gb/s lanes and 100GBASE-SR4 with four 25 Gb/s lanes. Other rates may use different lane counts and signaling. | Verify the exact application and lane configuration; do not assume that two cables with the same aggregate rate use the same signaling. |
| Cable length and reach | AOCs are available in fixed lengths, but maximum reach varies by data rate, design and application. Ethernet optical reach figures for a standard are not automatically the guaranteed reach of every AOC. | Choose a length that meets the measured route with reasonable slack. Confirm the specified maximum length for the exact cable model and application. |
| Optical fiber type | Many short-reach AOCs use multimode optical fiber. Fiber count, construction and supported reach depend on the cable design and application. | Request the fiber type and cable construction. Check routing requirements, bend limits and whether the cable is suitable for the installation environment. |
| Connector and termination | An AOC has active optical components integrated into its ends and typically connects directly to equipment ports; it is not simply a passive fiber patch cord with separate transceivers. | Confirm connector form factor at both ends, orientation, cable-end labels and whether the assembly is directional or has designated ends. |
| Power and thermal limits | Power consumption and heat output vary with speed, form factor and design. Higher-rate modules can impose different thermal requirements than lower-rate ones. | Ask for maximum power per end and operating-temperature specifications. Ensure the switch or server has adequate power and airflow capacity. |
| Compatibility and coding | Equipment may check module identification or supported cable coding. Compatibility can depend on the device model, operating software and port configuration. | Obtain written compatibility confirmation for both connected devices and verify any coding requirements before ordering. |
| Standards and testing | Ethernet application names and optical specifications are defined in IEEE 802.3; relevant requirements depend on the particular application. AOC-specific implementation details can vary. | Request the declared standards or application, test results, and quality documentation. Confirm what testing is performed on each finished assembly. |
| Environment and compliance | Operating temperature, storage conditions, flammability rating and regulatory documentation depend on the product and destination market. | Specify the deployment location and destination country. Request applicable safety, materials and regulatory declarations for the exact product. |
| Lifecycle and support | Warranty, lead time, availability, repair or replacement options, and product-change notification policies are supplier-specific. | Compare warranty terms, delivery commitments, traceability and ongoing availability, especially for multi-site or long-term deployments. |