Magnum 6K25e Gigabit Fiber Switch Installation and User Guide (10/07)
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APPENDIX B : Internal DC Power Supply Options
B1.0
SPECIFICATIONS FOR MAGNUM 6K25E SWITCHES, DC POWER
Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 36 - 70 VDC
Power Consumption: Same as for AC models (see Section 1.1)
Power Supply (Internal 24 VDC Option) Industrial Applications
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 20 - 36 VDC
Power Consumption: Same as for AC models (see Section 1.1)
Power Supply (Internal 125 VDC Option) Industrial Applications
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 88 - 150 VDC
Power Consumption: Same as for AC models (see Section 1.1)
With the exception of the power supply, all specifications and
functions of Magnum 6K25e Switch -48VDC, 24VDC and 125VDC models are
identical to those listed in the main manual.
B2.0
-48VDC, 24VDC and 125VDC POWER, THEORY OF OPERATION
The -48VDC, 24VDC and 125VDC power options are designed using diodes
inside on each DC power input line behind the two external power connection terminals,
so that the power from an external
source can only flow into the hub.
This allows the Switch to operate
only whenever DC power is
correctly applied to the two inputs.
It protects the Switch from incorrect DC input connections. An incorrect polarity
connection, for example, will neither affect the Switch, its internal power supply, nor will
it blow the fuse in the internal power supply.
The manual power “On-Off” Switch (optional) is used for powering the unit on
and off when it is placed into or taken out of service.
B3.0
APPLICATIONS FOR DC POWERED SWITCHES
Magnum 6K25e Fiber Switches are easily installed in a variety of applications
where -48VDC, 24VDC and 125VDC power is used as the primary power source. The-
48VDC, 24VDC and 125VDC power configuration provides an Ethernet networking
solution utilizing a special power supply in a managed Fiber Switch.
The –48VDC solution is particularly useful in the telecommunication industry,
where it is common for facilities to operate on -48VDC power. Such companies include
regular and wireless telephone service providers, Internet Service Providers (ISPs) and
A+
A-
GND
GND
CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH
