3Com 7750 Series Manuale d'uso - Pagina 5
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PoE Power Rack Installation Guide
Overview
Figure 2-1 shows the schematic diagram of the PoE Power Rack power system, showing the interconnections
and signal flow through the power supply modules and internal components.
Figure 2-1 Schematic diagram of the PoE Power Rack
2..1 Power Supply Modules
DC power is supplied to the power bus by the power supply modules.
(Note: The PoE Power Supply Module (3C16884) is interchangeable between the Switch 7750 PoE Power
Rack and the Switch 8800 PoE Power Rack. NO other components are interchangeable).
2..2 PoE Power Rack
Up to three power supply modules can be mounted in each PoE Power Rack. Each power supply module in
the PoE Power Rack receives AC power from the AC distribution panel.
2..3 Power Supply Module Visual indicators
The front panel of the power supply module has three LEDs. Their descriptions, colors and functions are as
follows.
Table 2-1 LEDs state description
Condition
All OK
Thermal alarm (Ambient)
Thermal alarm (fan fail)
Blown AC fuse in unit
Low or no AC > 15mS (single unit)
Chapter 2 System Description
AC OK (green)
1
1
1
1
0
DC OK (green)
1
0
0
0
0
2-1
Chapter 2 System Description
Fault (Red)
0
0
1
1
0