GarrettCom PS14P - Manual (Page 37)

S14 & PS14P (PoE) Convenient Switches Installation and User Guide (01/06)
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AC and DC Power Supplies with extended temperature ratings
S14-Series power input may be a variety of types, external AC and internal
DC at 12V, 24V, or -48VDC. AC may be at extreme temperatures.
DC-input models can operate as dual-source (S14-series)
The 12V DC jack is present on DC-input models, so that the unit can operate
from an external AC PS, or from DC applied to the terminal block, either or
both present.
Dual-source power may increase availability, or be
convenient to move the unit from a test lab out to the factory floor.
DC-Power input for PoE Power Source Switch(PS14P)
The 802.3af PoE standard PS14P power source switch requires 1.4Amps-
48VDC to provide enough power for 13-15watts on each RJ-45 port. The
Terminal block for -48V DC input is a range of 46V to 60V DC.