Rear viewThe following illustration shows the indicators on the rear of the memoryexpansion module.Power-onLEDLocateLEDSystemerrorLEDAC LED (green)DC LED (green)Power supplyfault (error) LEDQPIport 1PowerconnectorsEXA port 1LEDlinkEXA port 2LEDlinkEXA port 3LEDlinkEXAport 1EXAport 2EXAport 3QPIport 2QPIport 3QPIport 4v Power-on LED: When this green LED is lit, it indicates that the memoryexpansion module is powered on. This LED is functionally equivalent to thepower-on LED on the front of the memory expansion module.v Locate LED: When this blue LED is lit, it indicates that the command from theserver IMM to the memory expansion module is complete. Use this blue LED tolocate the memory expansion module. The front locate LED also has a buttonthat you can press to locate other servers or other memory expansion modulesto which the memory expansion module is connected. This LED is functionallyequivalent to the locate LED on the front of the memory expansion module.v Power connector: Connect a power cord to one of these connectors.v AC power LED: Each hot-swap power supply has an ac power LED and a dcpower LED. When the ac power LED is lit, it indicates that sufficient power isbeing supplied to the power supply through the power cord. During normaloperation, both the ac and dc power LEDs are lit.v DC power LED: Each hot-swap power supply has a dc power LED and an acpower LED. When the dc power LED is lit, it indicates that power supply issupplying adequate dc power to the memory expansion module. During normaloperation, both the ac and dc power LEDs are lit.v Power supply fault (error) LED: When this amber LED is lit, it indicates a faultyhot-swap power supply.v EXA link LED: When this green LED is lit, it indicates that an EXA link isfunctioning.Turning on the memory expansion moduleThe memory expansion module is controlled by the server. Turning on the memoryexpansion module refers to connecting the memory expansion module power cordto the power source and pressing the power-control button on the host server. Thehost server must be connected to the memory expansion module and configured toidentify the memory expansion module. Normally, when the operating system onthe server starts, the server issues a power-on request to the memory expansionmodule.26 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide
