A 1.25G SFP (Small Form-factor Pluggable) module, BIDI (Bi-directional), operates at 1310nm wavelength and supports distances up to 40km using an LC port. This module facilitates bi-directional data transmission over a single strand of single-mode fiber optic cable, making it suitable for applications requiring efficient and economical communication over longer distances. It is commonly used in telecommunications and enterprise networks where maximizing fiber infrastructure is critical while ensuring reliable data transmission.