Lenovo ThinkSystem SR950 - Page 290

Table 222. I/O tray connectors
Callout Callout
1 Riser for slot 1 to 4 connectors (Riser 1) 8 Network (LOM) connector (slot 9)
2 PCIe3, x16, 75 watt connector (slot 5) 9 TCM connector (see “Enable TPM/TCM” in the
ThinkSystem SR950 Maintenance Manual
)
3 PCIe3, x16, 75 watt connector (slot 6) 10 Riser for slot 10 to 15 connectors (Riser 2)
4 PCIe3, x8, 25 watt connector (slot 7) 11 M.2 SATA/PCIe (Hypervisor) backplane connector
(see note following this table)
5 Signal cable to power backplane 12 Riser for PCIe slot 16 to 17 (Riser 3)
6 Battery (CR2032) 13 SW2 - Switch block 2
7 ML2 PCIe3, x16 connector (slot 8) 14 SW1 - Switch block 1
Note: This switch block is reserved.
Notes: The following PCIe “slots” are assigned to components elsewhere in the server:
• PCIe slot 18 is assigned to the RAID card in the lower tray.
• PCIe slot 19 is assigned to the RAID card in the upper tray.
• PCIe slot 20 is assigned to the M.2 backplane inside the I/O tray.
I/O tray switches
Two switch blocks are located on the I/O tray
SW1
The switch block SW1 is located near the VGA connector on the I/O tray. All switches in this switch block are
reserved.
SW2
The switch block SW2 is located near the M2 SATA/PCIe backbplane connector.
Table 223 “SW2 switch block definition” on page 286 describes the functions of the switch block.
Table 223. SW2 switch block definition
Switch number
Default position Description
1
Off TPM/TCM physical presence.
2
Off
Reserved.
3
Off
Reserved.
4
Off Clear CMOS memory. When this switch is toggled to ON, it clears
the data in CMOS memory, which clears the power-on password.
5
Off Force UEFI recovery. Changing the position of the switch to ON will
force the system to boot from the recovery UEFI image.
6
Off Force XCC backup bank. Changing the position of the switch to ON
will force the system to boot from the backup XCC bank.
286 ThinkSystem SR950 Setup Guide