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Rear view
The following illustration shows the indicators on the rear of the memory
expansion module.
Power-on
LED
Locate
LED
System
error
LED
AC LED (green)
DC LED (green)
Power supply
fault (error) LED
QPI
port 1
Power
connectors
EXA port 1
LEDlink
EXA port 2
LEDlink
EXA port 3
LEDlink
EXA
port 1
EXA
port 2
EXA
port 3
QPI
port 2
QPI
port 3
QPI
port 4
v Power-on LED: When this green LED is lit, it indicates that the memory
expansion module is powered on. This LED is functionally equivalent to the
power-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 the
server IMM to the memory expansion module is complete. Use this blue LED to
locate the memory expansion module. The front locate LED also has a button
that you can press to locate other servers or other memory expansion modules
to which the memory expansion module is connected. This LED is functionally
equivalent to the locate LED on the front of the memory expansion module.
v System error LED: When this LED is lit, it indicates that a system error has
occurred.
v QPI ports: Insert either a QPI cable or a filler panel in each of these connectors.
Note: When you handle the QPI cables, take precautions to avoid damaging the
high density interface. Dropping or incorrectly connecting the QPI cables can
damage the high density interface. Store the protective covers that come on the
end of the QPI cables for reuse when you perform maintenance on the server or
memory expansion module or when you remove the cables of any reason.
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 dc
power LED. When the ac power LED is lit, it indicates that sufficient power is
being supplied to the power supply through the power cord. During normal
operation, 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 ac
power LED. When the dc power LED is lit, it indicates that power supply is
supplying adequate dc power to the memory expansion module. During normal
operation, both the ac and dc power LEDs are lit.
v Power supply fault (error) LED: When this amber LED is lit, it indicates a faulty
hot-swap power supply.
v EXA link LED: When this green LED is lit, it indicates that an EXA link is
functioning.
Chapter 1. The System x3850 X5 and x3950 X5 server 27