GarrettCom DS50 - Manual (Page 38)

Magnum DS50 / DS60s Dual Speed Hubs Installation and User Guide (06/02)
APPENDIX B : Optional 24VDC or -48VDC Power Supply
B1.0 SPECIFICATIONS - FOR MAGNUM DS50 / DS60 DUAL-SPEED HUBS PLUS
Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: ( -) , “GND”, (+)
Input Voltage: -36 to -72 VDC
Power Consumption: Model DS50 / DS60: 6 watts typical, 10 watts max.
Power Supply (Internal 24VDC Option)
DC Power Connector: 3 terminals: ( -) , “GND”, (+)
Input Voltage: 20 to 36 VDC
Power Consumption: Model DS50 / DS60: 5 watts max.
With the exception of the power supply, all specifications and functions of Magnum DS50
/ DS60 24VDC or -48VDC models are identical to those listed in the main manual.
B2.0 24VDC or -48VDC POWER OPTION, THEORY OF OPERATION
The 24VDC or -48VDC power option is 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 DS50/60 to operate only
whenever DC power is correctly applied to
the two inputs. It protects the hub from incorrect DC input connections. An incorrect polarity
connection, for example, will neither affect the Dual-speed Hubs, nor its power supply
internally, nor will it blow the fuse in the internal power supply.
A+
A-
GND
GND CHASSIS
FUSE
+
-
SUPPLY
HUB
B3.0 APPLICATIONS FOR DC POWERED ETHERNET HUBS
Magnum DS50 / DS60 are easily installed in a variety of applications where 24VDC
or -48VDC power is used as the primary power source. The –48VDC and 24VDC 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 regular and
wireless telephone service providers, Internet Service Providers (ISPs) and other
communication companies. In addition, many high availability equipment services, such as
broadcasters, publishers, newspaper operations, brokerage firms and other facilities often use a
battery backup system to maintain operations in the event of a power failure. It is also
frequently used for computer system backup, management and operations monitoring
equipment.
The 24VDC solution is particularly useful in the Industrial environment, where it is
common for facilities to operate on 24VDC power. The 24VDC application is mainly used in
the Industrial environment, such as chemical plants, paper mill, stone quarrying plant,
wastewater treatment Plant etc.
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