IBM BNT RackSwitch G8124R, Installation Manual

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Introduction
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9
The Power Supply LED indicates the status of the power supplies. The LED blinks when only one
power cord is connected or if one power supply fails. The LED lights steady when both power cords
are connected and operating.
DC Power Supply
The DC Powered G8124 has two redundant 250W DC-DC power supplies, operating from
42V to 60V. Each internal power supply has a DC filter input on the rear panel. The DC power
sources are connected to the G8124 via the mating connector cable assemblies provided. One end of
the cable is connected to the G8124 and the three DC-input leads connect the DC-input power
supply to the site power source. The pigtail end of the cable is color coded, as follows:
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Black: Negative (-48V)
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Red: Positive (return)
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Green: Ground