Your attached photo is the new optical ProISL connection socket of MSB. It needs a dual-LC type of optical cable.
This is the newest ProISL connection of MSB.
Similar to the past ProI2S, ProISL is an I2S format, conducting the various clock signal and music data simultaneously.
ProISL and ProI2S are also bi-directional. The MSB transport will be slaved by the clock signal sent from MSB dac.
This new ProISL utilizes high speed single-mode optical conduction with lower latency and electrical isolation between the transport and dac.
CK,
not entirely clear whether you were able to hear this newest dual ProISL interface?
if not; when will that new interface be auditioned?