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# Jumpers and Connectors

Dell™ PowerEdge™ R905 Hardware Owner's Manual

System Board Jumpers

Disabling a Forgotten Password

System Board Connectors

Processor Expansion Module Board Connectors

SAS Backplane Board Connectors

SAS 2.5-Inch Peripheral Interposer Board

This section provides specific information about the system jumpers. It also provides some basic information on jumpers and switches and describes the connectors on the various boards in the system.

## System Board Jumpers

Figure 7-1 shows the location of the configuration jumpers on the system board. Table 7-1 lists the jumper settings.

Table 7-1. System Board Jumper Settings

Jumper | Setting | Description
--- | --- | ---
PWRD_EN | (default) | The password feature is enabled (pins 4-6)
| The password feature is disabled (pins 2-4)
NVRAM_CLR | (default) | The configuration settings are retained at system boot (pins 3-5)
| The configuration settings are cleared at the next system boot (pins 1-3)

## Disabling a Forgotten Password

The system's software security features include a system password and a setup password, which are discussed in detail in Using the System Setup Program. The password jumper enables these password features or disables them and clears any password(s) currently in use.

| CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
2. Open the system. See Opening and Closing the System.
3. Move the password jumper to pins 2-4 to clear the password.

See Figure 7-1 to locate the password jumper on the system board.

1. Close the system.
2. Reconnect your system and peripherals to their electrical outlets, and turn on the system.

The existing passwords are not disabled (erased) until the system boots with the password jumper plug removed. However, before you assign a new system and/or setup password, you must install the jumper plug.

| NOTE: If you assign a new system and/or setup password with the jumper plug still removed, the system disables the new password(s) the next time it boots.

1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
2. Open the system. See Opening and Closing the System.
3. Move the password jumper to pins 4-6 to restore the password function.
4. Close the system.
5. Reconnect your system and peripherals to their electrical outlets, and turn on the system.
6. Assign a new system and/or setup password.

To assign a new password using the System Setup program, see Assigning a System Password.

## System Board Connectors

See Figure 7-1 and Table 7-2 for the location and description of the system board connectors.

Figure 7-1. System Board Connectors

Table 7-2. System Board Connectors

Connector Label | Description
--- | ---
1 | PCIE_Xn_n | PCIe expansion slots (7)
2 | INT_STORAGE | SAS controller card connector
3 | RAC_CONN | remote access card connector
4 | RAC_CONN2 | connector for the 40-pin RAC cable
5 | INT_SD | SD card connector
6 | RAC_CONN1 | remote access card (RAC) connector
7 | INT_USB | internal USB connector
8 | SATA | SATA controller connector
9 | CONTROL_PANEL | control panel cable connector
10 | An | memory module connectors (8)
11 | CPU1 | processor 1 socket
12 | PWR_3.3Stby_Cntrl | Power distribution board signal connector
13 | GROUND | Power distribution board signal connector
14 | 12V | 12-V power connector
15 | CONN_Jn | riser card connector (5)
16 | CPU2 | processor 2 socket
17 | Bn | memory module connectors (8)
18 | PWRD_EN | password jumper
19 | NVRAM_CLR | configuration jumper
20 | Intrusion Detection | intrusion switch connector
21 | LOM Mezzanine Card | NIC daughter card connector
22 | BATTERY | connector for the 3.0-V coin battery
23 | TOE KEY | TOE/iSCSI key connector
NOTE: For the full name of an abbreviation or acronym used in this table, see the "Glossary" on page 181.

## Processor Expansion Module Board Connectors

See Figure 7-2 and Table 7-3 for the location and description of the PEM board connectors.

Figure 7-2. Processor Expansion Module Board Connectors

Table 7-3. Processor Expansion Module Board Connectors

Connector Label | Description
--- | ---
1 | Cn | memory module connectors (8)
2 | Dn | memory module connectors (8)
3 | CPU4 | processor 4 socket
4 | CONN_Jn | riser card connector (5)
5 | CPU3 | processor 3 socket
NOTE: For the full name of an abbreviation or acronym used in this table, see the "Glossary" on page 181.

## SAS Backplane Board Connectors

Figure 7-3 shows the location of the connectors on the backplane board.

Figure 7-3. SAS Backplane Board Connectors

1 | data interface | 2 | control panel (on front of board)
3 | power | 4 | SAS B
5 | installation alignment slot | 6 | power SAS A

Figure 7-4. SAS Backplane Board Connectors: 2.5-inch Option

1 | SAS B | 2 | SAS A
3 | backplane power |  |

## SAS 2.5-Inch Peripheral Interposer Board

In addition to the backplane, systems with 2.5-inch drives also have a peripheral interposer board.

Figure 7-5. SAS Peripheral Interposer Board Connectors

1 | control panel | 2 | power
3 | power to backplane | 4 | data interface

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