Chapter 1: Overview
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Power Supply Interfaces (Opto-couplers)The chassis has two power supply interfaces, also referred to as opto-
couplers, in the lower right corner of the rear panel. The interfaces, labeled
Power Supply Interface, are used by the active master control card to
obtain status information from the power supplies. The interfaces are
shown in Figure 32.
Figure 32. Power Supply Interfaces (Opto-couplers)
The control card uses the top interface to communicate with the power
supplies in slots A and C, and the bottom interface to communicate with
the power supplies in slots B and D.
The power supply interfaces are not hot swappable and should only be
serviced by an authorized service technician.
LED Each interface has one LED, labeled Power. The LED is described in
Table 21.
Table 21. Power Supply Interface LED
LED State Description
Power
Solid Green The interface is operating normally.
Off Here are the possible conditions of this LED
state:
The corresponding power supply
slots of the interface are empty.
The power supplies in the power
supply slots are powered off or have
failed.
The power supplies in the power
supply slots are powered on and
functioning normally, but the power
supply interface has failed.