GarrettCom TB14H - Manual (Page 45)

TB14 and TB14H 10Mb Media Converters Installation and User Guide
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DC) has a built-in terminal block for +, -, ground. The 12V DC jack is also present.
Detail information about the 12 VDC, the 24V DC and the –48V DC is provided in the
Technical Specifications Section 1.1.
The various models of power type and extended ambient temperature
power supplies are optional and choice needs to be called out on your
order.
Note: When connected to a -48 V centralized dc source these products are to be installed
only in Restricted Access Areas (dedicated
equipment rooms, electrical closets or the like).