IBM 86626RY Hardware Maintenance Manual - Page 170
LEDs for hot-plug PCI slots, two Attention LEDs and one Power LED.
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1 Not available for use 2 Non-hot-plug 32-bit PCI slot 5 (on PCI primary bus 0, half card only) 3 Hot-plug 32-bit PCI slots 1-4 (on PCI primary bus 1) 4 Attention LEDs for hot-swap slots 5 Power LEDs for hot-swap slots 6 16-bit ISA slot LEDs for hot-plug PCI slots: Each hot-plug PCI slot has three LEDs associated with it - two Attention LEDs and one Power LED. Power LED: This LED is on when the hot-plug PCI slot is active and has power. An adapter must not be added to or removed from the PCI slot when the Power LED is on. When this LED is off, the PCI slot is inactive and has no power applied. An adapter can be installed when the Power LED for the PCI slot is off. Refer to the operating system documentation to determine if it supports hot-plug PCI adapters, and, if so, how to disable the hot-plug PCI slot. Attention LEDs: Each hot-plug PCI slot has an Attention LED that is visible from the rear of the server and one that can be seen from inside the server. (The LEDs have the same meaning; they are duplicated to be visible from outside or inside the server.) An Attention LED flashes approximately once per second when it is on. The meaning of the Attention LEDs is defined by the operating system. 162 Netfinity Server HMM