Magnum 4K220 Switches Installation and User Guide (10/04)
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APPENDIX B : Internal DC Power Supply Option
B1.0
SPECIFICATIONS - FOR MAGNUM 4K-SERIES SWITCHES
Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 36 - 70 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.
Power Supply (Internal 24 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 20 - 40 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.
Power Supply (Internal 125 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 120 - 160 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.
With the exception of the power supply, all specifications and functions of
Magnum 4K-Series-48VDC, 24VDC and 125VDC models are identical to those
listed in the main manual.
B2.0
-48VDC, 24VDC & 125VDC POWER OPTION, THEORY OF
OPERATION
The -48VDC, 24VDC & 125VDC power option 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 effect the Switch, nor its power supply internally,
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
Magnum 4K-Series Fiber Switches are easily installed in a variety of
applications where -48VDC, 24VDC & 125VDC power is used as the primary power
source. The- 48VDC, 24VDC & 125VDC power configuration provides an Ethernet
A+
A-
GND
GND
CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH
