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Magnum 6K16-Series Managed Fiber Switch Installation and User Guide (04/06)
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DC terminal
block
C2.0 MAGNUM 6K16-SERIES, with -48VDC, 24VDC and 125VDC Dual-Source
option
The 6K16-Series-Switch models with the internal -48VDC, 24VDC and
125VDC Dual-Source power supply are designed for installations where a battery plant
is the power source, and where two separate power sources are utilized in order to
increase operational uptime and to simplify maintenance.
The functionality of the Magnum 6K16-Series Switch -48VDC, 24VDC and
125VDC Dual-Source Option units is identical to the standard AC-powered models.
Refer to the main sections of this Installation and User Guide for a detailed description
of the Magnum 6K16-Series Switches.
C3.0 DUAL-SOURCE OPTION, THEORY OF OPERATION
The Dual-Source DC power
option is designed using diodes inside
of the chassis on each DC power input
line. A diode is placed in each of the
four input lines (behind the four
external power connection terminals)
so that power from an external source
can only flow into the unit. This allows the unit to operate whenever DC power is
correctly applied to either or both of the two inputs
C4.0 FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN
a) 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.
b) 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.
c) 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.
d) 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.
e) The Switch will not receive power (and will not work) when both inputs are simultaneously
absent or are both incorrectly connected.
C5.0 INSTALLATION
This section describes the proper connection of the -48VDC, 24VDC and
125VDC dual source leads to the -48VDC, 24VDC & 125VDC power terminal block on
the Magnum 6Ks Switch (shown in Figure )
GND
FUSE
+
-
SUPPLY
A+
A-
B-
B+
GND
CHASSIS
HUB