It seems like there might be a misunderstanding or confusion in your question. MMF and SMF typically refer to different types of optical fibers used in networking:

MMF (Multi-Mode Fiber) and SMF (Single-Mode Fiber) are two different types of optical fibers, and they are not typically mixed within the same network or communication system. Mixing MMF and SMF can lead to signal loss, distortion, and compatibility issues.

MMF is designed to carry multiple modes of light simultaneously, and it has a larger core diameter compared to SMF. It is commonly used for short-distance applications within buildings or data centers.

SMF, on the other hand, is designed to carry a single mode of light, providing a higher bandwidth and longer transmission distances. It is often used for long-distance telecommunications and high-speed data transmission.

If you need to connect devices that use MMF and SMF, you would typically use a media converter or a compatible transceiver that supports both fiber types. However, it's crucial to ensure that the optical characteristics match to avoid signal degradation and communication issues.