If there is a yellow fibre cable plugged in then its SM. Going by what you said, are all the cables, orange and aqua, in. There are different types of fiber optic cables because each type is optimized for specific applications that have unique requirements for bandwidth, transmission distance, and environmental factors. Multimode Fiber comparison, I will compare those two fiber optic cables, helping you learn the difference and determine which best suits your fiber cabling system. This limits the optical signal to only one path or mode, hence the name “Single-mode.