Lenovo ThinkSystem SR950, Setup Manual, Page: 290 / 390

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