Pliant Crewcom CCU-22 Operating Manual page 24

Power for Fiber Devices
Fiber connections will not transfer power to a CrewCom device. For CrewNet-compatible devices using fiber
connectivity, local power must be supplied to that device using a Pliant 48VDC power supply (PPS-48V-02 included
with Hubs, sold separately for all other devices). Once local power is supplied to the device, downstream devices may
receive power via PoC (subject to limitations, depending on the line lengths and the number and configuration of
those connected devices.)
Introduction - 16