CHAPTER C: INTERNAL DC DUAL-SOURCE POWER INPUT OPTION
FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN
MULTILINK ML810 MANAGED EDGE SWITCH – INSTRUCTION MANUAL
C–5
C.4
Features and Benefits of the Dual-Source Design
The Switch unit can receive power from either input, “A” or “B”. The hub will normally draw
its power from the DC source with the highest voltage at a given time.
The Switch unit will not allow power to flow from a higher voltage input to a lower voltage
input, i.e. the two DC power sources are not mixed together by the hub.
When one correct DC input is present, the Switch will receive power if the other DC input is
absent, or even if it is connected with reverse polarity or shorted or grounded.
Reverse polarity connections, if they should accidentally occur on either input, will not
damage the Switch or power supply internally (nor will it blow the fuse in the internal
power supply) because of the blocking action of the diodes. This is true even if one input
connection is reversed while the Switch is operating from the other source.
The Switch will not receive power (and will not work) when both inputs are simultaneously
absent or are both incorrectly connected.
Figure C-1: DC Dual-Source, wiring connections with Dual-Source option.
Dual Source
Terminal Block
