Magnum 6KQ Managed Field Switch Installation and User Guide (04/07)
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APPENDIX B : DC Power Input
B1.0
Specifications for Magnum 6KQ Switches, DC Power at 24V and –
48V and 125V DC Power input
Each
Magnum Model 6KQ Managed Switch requires DC power input, at either
24VDC, -48VDC or 125VDC nominal. The wide range of DC power input types
qualifies this product for use in 24VDC, -48VDC as well as 125VDC applications in
different industries.
DC Power Terminals
: “+”, “
-
”
are
internally floating so that user may ground either
GND
: ground wire connection to the 6KQ chassis screw
Power Consumption:
35 watts typical (for a fully loaded fiber model)
12 watts typical (for a small 4 port copper-only model)
24VDC Power
Input nominal (18 to 36VDC range)
-48VDC Power
Input nominal (36 to 60 VDC range)
125VDC Power
Input nominal (88 to 150VDC range)
Standard 6KQ DC Power Input Terminal Block
: “ -, GND, + ”
See also Section 1.0, Technical Specifications, for the 6KQ base unit
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.
B3.0
APPLICATIONS FOR DC POWERED ETHERNET SWITCHES
Magnum 6KQ Switches are easily installed in a variety of applications where -
48VDC, 24, or 125VDC power is used as the primary power source. The DC power
configuration capability provides an Ethernet networking solution utilizing a special
power supply in switches with a proven track record.
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
