Table 8. System-board switch block SW5 (continued)
Switch number
Description
Definition
SW5-3 Real time clock (RTC) reset The default position is Off. Changing
this switch to the On position resets the
RTC. A momentary toggle is all that is
required. To avoid excessive CMOS
battery drain, do not leave this switch in
the On position.
SW5-4 Serial select The default position is Off (send the
serial input output (SIO) to the front
serial port). Changing this switch to the
On position sends the BMC to the serial
port.
• The following table describes the functions of the switches on switch block SW8.
Table 9. System-board switch block SW8
Switch number
Description
Definition
SW8-1 Boot backup XClarity Controller When the switch is in the default Off
position, the compute node will boot by
using the primary XClarity Controller
firmware. When the switch is in the On
position, the compute node will boot by
using a backup of the XClarity
Controller firmware.
SW8-2
Boot backup UEFI
The default position is Off. Changing
this switch to the On position forces the
compute node to boot from the backup
UEFI image.
SW8-3 iBMC force update The default position is Off. Changing
this switch to the On position bypasses
the operational firmware image and
performs a BMC firmware update, if the
normal firmware update procedure
results in an inoperative BMC.
Note: Use this switch only if the normal
firmware update procedure fails and the
operational firmware image is
corrupted. Use of this switch disables
normal baseboard management
controller operation.
SW8-4 Wake on LAN (WOL) disable Changing this switch to the On position
disables WOL.
KVM cable
Use this information for details about the KVM cable.
Use the KVM cable to connect external I/O devices to the compute node. The KVM cable connects through
the KVM connector (see “Compute node controls, connectors, and LEDs” on page 11). The console breakout
cable has connectors for a display device (video), two USB 2.0 connectors for a USB keyboard and mouse,
and a serial interface connector.
The following illustration identifies the connectors and components on the KVM cable.
16
ThinkSystem SN550 Compute Node Maintenance Manual
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