SFP module

To choose, start by identifying the target bandwidth and the distance you need to cover. 10 Gbps LR or SM SFP+ modules, for example, support up to 10 km over single-mode fiber at 1310 nm using LC connectors. SR modules provide short links up to about 300–400 m over MMF OM3/OM4, while ER versions can reach 40 km over SMF at 1550 nm. 1 Gbps variants cover distances up to 550 m over MMF. These differences help you buy the right module for a data center or enterprise network use case.

All the modules shown use duplex LC connectors and follow the SFP MSA standard, with compatibility for IEEE 802.3ae (10 Gbps) and IEEE 802.3z (1 Gbps). Make sure your equipment has SFP/SFP+ slots and supports the module type you’re selecting (LR, SR, ER, LRM, etc.). DOM support is available on some models for optical monitoring, which makes it easier to diagnose and maintain links.

DOM stands for Digital Optical Monitoring and allows continuous monitoring of useful parameters such as received power and link status. This feature is available on some MMF modules (for example, the GLC‑SX‑MMD type 1 Gbps) and helps network operations, especially during deployments in multi-device environments. In practice, it helps you quickly identify causes of failure and plan replacements or adjustments with minimal disruption.

Choose SMF for long distances (up to 10 km and beyond in LR/ER offers) and MMF for shorter internal links or campus connections (LRM and SX cover about 220 m to 550 m depending on fiber type and the standard). Connectors remain duplex LC. Also check the type of fiber installed in your network and select the corresponding module to optimize lifespan and equipment compatibility.

Before installing, verify that the module is compatible with your hardware and the protocol you use. Make sure the module is properly inserted into the SFP port, and that the fiber cables are clean and securely connected. For maintenance, monitor DOM status when available and replace defective modules with versions that meet the same specifications. Avoid excessive bending and protect the fiber links from impacts and dust.