Magnum 4K24 Switches Installation and User Guide (10/04)
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APPENDIX C: Internal DC Dual-Source Power Option
C1.0
SPECIFICATIONS - FOR MAGNUM 4K-SERIES FIBER SWITCH
Power Supply (Internal, -48VDC Dual-Source, model # Dual-Src-48V)
DC Power Connector: First Source: “A+”, “A
-“
, 2nd Source “B
-
“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 36 - 70 VDC
Power Consumption: Model -4K24: 21 watt typical, 30 watts max.
Power Supply (Internal, 24VDC Dual-Source, model # Dual-Src-24V)
DC Power Connector: First Source: “A+”, “A
-“
, 2nd Source “B
-
“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 20 - 36 VDC
Power Consumption: Model -4K24: 21 watt typical, 30 watts max.
Power Supply (Internal, 125VDC Dual-Source, model # Dual-Src-125V)
DC Power Connector: First Source: “A+”, “A
-“
, 2nd Source “B
-
“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 120 - 160 VDC
Power Consumption: Model -4K24: 21 watt typical, 30 watts max.
With the exception of the dual DC input power connections and the power
supply, all specifications and configuration options for the Magnum 4K8 -48VDC, 4K8-
24VDC & 125VDC with this Dual-Source option are identical to those listed in the
Magnum 4K-Series Fiber Switches Installation and User Guide
, including Appendix B
“Internal DC Power Supply Option”
C2.0 MAGNUM 4K-SERIES , with -48VDC, 24VDC & 125VDC Dual-Source option
The 4K8-Switch models with the internal -48VDC, 24VDC & 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 4K-Series -48VDC, 24VDC & 125VDC
Dual-Source Option units are 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 4K-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
GND
FUSE
+
-
SUPPLY
A+
A-
B-
B+
GND
CHASSIS
HUB
