Nanorack
Credit: Nanoracks
The OCSD communication face of the satellite shows the major communication systems such as those of the laser transmitter and emitter, radio frequency antenna, and other sensors. The satellites will demonstrate the first-ever high-speed data downlink from a CubeSat to a ground station using lasers.
https://www.nasa.gov/spacetech/feature/CubeSat_Missions_Pushing_Boundaries_of_Technology