Magnum 4K16 Switches Installation and User Guide
(12/05)
28
www GarrettCom com
.
.
APPENDIX B : INTERNAL DC POWER SUPPLY OPTIONS
B1.0
SPECIFICATIONS - FOR MAGNUM 4K16 DC-POWERED SWITCHES
Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 36 - 70 VDC
Power Consumption: Model 4K16: 17 watt typical, 25 watts max.
Power Supply (Internal 24 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 20 - 36 VDC
Power Consumption: Model 4K16: 17 watt typical, 25 watts max.
Power Supply (Internal 125 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 120 - 160 VDC
Power Consumption: Model 4K16: 17 watt typical, 25 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 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 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
networking solution utilizing a special power supply in hubs 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
A+
A-
GND
GND
CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH
