The MU Small Form Factor design is a mini version of the SC connector, with a 1.25mm diameter Zircona ferrule. It was developed by NTT, and is very popular in Japan. The Novobit MU connector has a simple push-on connect/disconnect and is suitable for high density optical interconnect.
According to standards IEC 61754-6 / TIA 604-17 and performance standards IEC-61753, IEC 61754-6, IEC 61755-5-1.