The main thing to remember when attempting to install multi-mode fibre on a single mode installation is to use a mode conditioning patch cable. 📝 Why Can't You Directly Connect SMF and MMF? At its heart, the incompatibility is physical. Mode. Single fiber modules (BiDi) use one fiber for both transmitting and receiving data. They use a thin fiber. Therefore, this article will guide you through a systematic understanding of how to choose the correct patch cord type based on optical modules of different speeds (1G, 10G, 25G). As data rates increase from 10G → 100G → 400G → 800G, patch cables must handle more bandwidth, more density, and stricter. Even though, installing a Multi-mode on a Single-mode transceiver is possible, it is highly advisable to use compatible equipment.