GarrettCom DS8016 - Manual (Page 40)

Magnum DS8016 Dual-Speed Stackable Hubs Installation and User Guide (07/06)
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APPENDIX C: Optional 48V Dual-Source DC Power, Addendum
C1.0 SPECIFICATIONS - FOR MAGNUM DS8016 DUAL-SPEED HUBS
Power Supply (Internal, 48VDC Dual-Source model)
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 (auto-ranging)
Power Consumption: Model DS8016: 25 watt typical, 40 watts max.
With the exception of the dual DC input power connections and the power supply, all
specifications and configuration options for the Magnum DS8016-48VDC with this Dual-
Source option are identical to those listed in the Magnum DS8016 Dual-Speed Hubs
Installation and User Guide, including Appendix A “Optional 48VDC Power”
C2.0
MAGNUM DS8016 (48VDC DUAL-SOURCE POWER OPTION)
The hub models with the internal 48VDC 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 DS8016-48VDC Dual-Source Option hubs are
identical to the standard AC-powered models. All Port Module, SNMP and stacking options
are available for configuration with Dual-Source Option units. Refer to the main sections of
this Installation and User Guide for a detailed description of the Magnum DS8016 Hubs.
C3.0 DUAL-SOURCE OPTION, THEORY OF OPERATION
The Dual-Source DC power option is designed using diodes inside of the hub 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 hub. This allows the hub 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