Jumpers, Switches, and Connectors
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| support.dell.com Jumpers, Switches, and Connectors A-1
This appendix provides specific information about the jumpers on the system board. It also provides some basic information on jumpers and switches and describes the con- nectors and sockets on the various boards in the computer.
Jumpers and switches provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the system, you may need to change jumper settings on the system board. You may also need to change jumper or switch settings on expansion cards or drives.
Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit. To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.
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A jumper is referred to as open or unjumpered when the plug is pushed down over only one pin or if there is no plug at all. When the plug is pushed down over two pins, the jumper is referred to as jumpered. The jumper setting is often shown in text as
A-2 Dell PowerEdge 6450 Systems Installation and Troubleshooting Guide two numbers, such as 1-2. The number 1 is printed on the circuit board so that you can identify each pin number based on the location of pin 1. Figure A-1 shows the location and default settings of the jumper blocks on the system board. See Figure A-1 for the designations, default settings, and functions of the sys- tem's jumpers.
Switches control various circuits or functions in the computer system. The switches that you are most likely to encounter are dual in-line package (DIP) switches, which are normally packaged in groups of two or more switches in a plastic case. Two com- mon types of DIP switches are slide switches and rocker switches (see the following illustration). Each of these switches has two positions, or settings (usually on and off). To change the setting of a slide switch, use a small, pointed object such as a small screwdriver or a straightened paper clip to slide the switch to the proper position. To change the setting of a rocker switch, use the screwdriver or paper clip to press down on the appropriate side of the switch. In either case, do not use a pen, pencil, or other object that might leave a residue on the switch.
Figure A-1 shows the location of the configuration jumpers on the system board. Table A-1 lists the function of these jumpers.
support.dell.com Jumpers, Switches, and Connectors A-3
A-4 Dell PowerEdge 6450 Systems Installation and Troubleshooting Guide
ISA_CLR
(default)
The NVRAM configuration settings are retained at system boot. The NVRAM configuration settings are cleared at next system boot. (If the NVRAM configuration settings become corrupted and the system will not boot, install the jumper plug and then boot the system. Remove the jumper before restoring the NVRAM configuration information.) PASS
(default)
The password feature is enabled. The password feature is disabled. 500MHZ*
Jumpered when the microprocessor's internal speed is 500 MHz. 550MHZ* Jumpered when the microprocessor's internal speed is 550 MHz. 600MHZ*
Jumpered when the microprocessor's internal speed is 600 MHz (when available). 650MHZ* Jumpered when the microprocessor's internal speed is 650 MHz (when available). 700MHZ*
Jumpered when the microprocessor's internal speed is 700 MHz (when available). 750MHZ* Jumpered when the microprocessor's internal speed is 750 MHz (when available). 800MHZ*
Jumpered when the microprocessor's internal speed is 800 MHz (when available). 850MHZ* Jumpered when the microprocessor's internal speed is 850 MHz (when available). RSVD
Reserved (do not install jumper plug). jumpered
unjumpered * Only one of the speed jumpers should have a jumper plug installed NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and Acronyms," found later in this document. support.dell.com Jumpers, Switches, and Connectors A-5
Table A-2 lists the connectors and sockets located on the system board.
BACKPLANE Hot-pluggable SCSI backplane board interface cable connector BATTERY
Battery connector INTRUSn Intrusion-alarm switch connectors FANS
Fan connector FLOPPY
Diskette drive interface connector KEYBOARD
Keyboard connector MOUSE
Mouse connector MEMORY1, MEMORY2 Memory board connectors NETWORK Ethernet connector PARALLEL Parallel port connector; sometimes referred to as LPT1 PCIn PCI expansion-card connectors PCILEDPNL Hot-plug PCI indicator panel connector POWERn Power connectors PROC_n Microprocessor guide bracket assembly and connectors SECONDARY SCSI/IDE
IDE interface connector PRIMARY SCSI A, PRIMARY SCSI B
Ultra3 SCSI controller connectors SERIALn Serial port connectors; sometimes referred to as COM1 and COM2
SVRMGMT Connector for optional DRAC 2 card USB USB connector VGA Video connector NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and Acronyms." A-6 Dell PowerEdge 6450 Systems Installation and Troubleshooting Guide
The computer's software security features include a supervisor password and a user password, which are discussed in detail in "Using the System Setup Program" of the User's Guide. A password jumper on the system board enables these password fea- tures or disables them and clears any password(s) currently in use. To disable a forgotten supervisor password or user password, perform the following steps.
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1. Shut down the system, including any attached peripherals, and disconnect the system from the electrical outlet. 2. Open the panel doors on top of the computer. See “Accessing the Interior of Your System” in Chapter 7. 3. Refer to Figure A-1 for the location of the password jumper (labeled "PASS") on the system board. 4. Remove the jumper plug from the PASS jumper. 5. Close the panel doors, and then reconnect the computer to an electrical outlet and turn it on. The existing passwords are not disabled (erased) until the system boots with the PASS jumper plug removed. However, before you assign a new system and/or user password, you must install the jumper plug. NOTE: If you assign a new system and/or user password with the jumper plug still removed, the system disables the new password(s) the next time it boots. 6. Shut down and unplug the computer and open the panel doors. 7. Install the jumper plug on the PASS jumper. 8. Close the panel doors, and then reconnect the computer and peripherals to their electrical outlets and turn them on. 9. Assign a new system and/or user password. To assign a new system password using the System Setup program, see "Assign- ing a System Password" in the User's Guide. To assign a new user password using the System Setup program, see "Assigning a User Password" in the User's Guide. Document Outline
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