GarrettCom 8000X - Manual (Page 58)

Magnum 8000X Mixed-Media Fiber Hubs Installation and User Guide (05/ 02)
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APPENDIX B : Internal DC Power Supply Option
B1.0 SPECIFICATIONS - FOR MAGNUM MIXED -MEDIA 8000X HUBS
Power Supply (Internal -48 VDC Option)
DC Power Connector: 3 terminals: “
-
“, “GND”, “+”
Input Voltage: 36 - 70 VDC
Power Consumption: Model 8000X: 30 watt typical, 50 watts max.
Power Supply (Internal 24 VDC Option)
DC Power Connector: 3 terminals: “ - “, “GND”, “+”
Input Voltage: 20-36 VDC
Power Consumption: Model 8000X: 30 watt typical, 50 watts max.
Power Supply (Internal 125 VDC Option)
DC Power Connector: 3 terminals: “ - “, “GND”, “+”
Input Voltage: 120 - 160 VDC
Power Consumption: Model 8000X: 30 watt typical, 50 watts max.
With the exception of the power supply, all specifications and functions of
Magnum 8000X-48VDC 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 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 unit. This allows the 8000X to
operate only whenever DC power is
correctly applied to the two inputs. It protects the 8000X from incorrect DC input
connections. An incorrect polarity connection, for example, will neither affect the
8000X, 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 ETHERNET HUBS
Magnum 8000X’s 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 regular and wireless telephone service providers, Internet Service
Providers (ISPs) and other communication companies. In addition, many high
A+
A-
GND
GND CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH