4. Names and Functions of PartsExpress5800/R120d-2M User’s Guide32Chapter 1 General Description4.3 Rear View(1) Power unit (Power supply slot 1)The power unit supplies DC power to the server.(2) AC InletThis socket is used to connect the power cord.(3) AC POWER LEDThe LED indicates power supply status.(See page 42.)(4) Thumb nutUsed to secure the top cover.(5) Slot for full-height PCI cardSlot to install a full-height PCI card. Assigned PCI slotnumber is "1B, 2B, and 3C".(6) Slot for low-profile PCI cardSlot to install a low-profile PCI card. Assigned PCI slotnumber is "1C and 2C".(7) Blank cover (for additional power unit)Remove this cover to install an optional power unit.(8) USB connectorsThese connectors are used to connect devices thatsupport the USB interface.(9) LINK/ACT LEDThe LED indicates the access status of LAN. (See page41.)(10) LAN connectors1000BASE-T/100BASE-TX/10BASE-T supported networkconnectors(10)-1: LAN port connector 1(10)-2: LAN port connector 2If Shared BMC LAN feature is enabled in ROM Utility, LANconnector 1 can also be used as the management LANport. However, sharing port is not recommended fromthe point of performance and security, because LAN port 1may receive both data.(11) SPEED LEDThe LED indicates the transfer speed of LAN ports.(See page 41.)(12) Management LAN connectorA LAN connector which supports 100BASE-TX/10BASE-T.This port cannot be used as a data transmission port.This port is used for connecting to EXPRESSSCOPEEngine 3.(13) Serial port A (COM A) connectorThis connector is used to connect devices that support aserial interface. Note that it is not possible to directlyconnect to a leased line.(14) Display connectorThe connector to connect a display unit.This connector is exclusively used with the displayconnector on front panel.(15) DUMP Switch (NMI)When DUMP Switch is pressed, memory dump isperformed.(16) UID (Unit ID) Switch/LEDThe switch to turn on and off UID LED.Pressing the switch once turns on UID LED and pressingagain turns off the LED.Commands from the software also cause it to turn on orflash. (See page 39.)(17) POWER LEDThis LED indicates power supply status. (See page 37.)(18) Blank cover (for LAN riser card)Remove this cover to install an optional LAN riser card.