DeWalt R510 manual 4Video Connector Rack Systems, 5USB Connectors, USB Controller Priorities

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The Power LED has two states:

•Power LED is OFF: System is not operating, regardless of AC present. (Other AUX powered subsystems may be operational with AC power present.)

•Power LED is ON (Green): System is operating. One or more of the non-standby (Vaux) power rails are active.

All PowerEdge servers include a green colored LED on the motherboard to indicate the presence of standby power (Vaux). This LED is in a visible location for service personnel. Some server operating systems allow users to configure the function of the power button through the ACPI feature.

The system has the capability to remember the state of the Power button prior to AC loss (option selected through BIOS setup). If this option is enabled via BIOS setup, system power returns to the state prior to AC loss with the resumption of AC.

If the power button is disabled through system management mechanisms, the user can shut down the system during a crash (regardless of the Power button enable/disable settings).

Table 6. Power Button Behavior under ACPI/Non-ACPI Operating Systems

		Non-ACPI OS or ACPI OS
Action	ACPI OS w/ACPI Enabled	w/ ACPI Disabled	ACPI or Non-ACPI OS
	System Turned ON	System Turned ON	System Turned OFF
Press and release	System performs a graceful	System turns off	Boots
power button	shutdown
Hold power button for	System turns off	System turns off	System starts and shuts down 6
6 seconds			seconds later.

4.3.4Video Connector (Rack Systems)

The video connector is used to attach a video graphics array (VGA)-compatible monitor to rack-based systems. Space around the connector accommodates full usage of it with all adjacent interfaces (USB connectors, button, LED’s, etc.).

4.3.5USB Connectors

USB connectors are used to attach USB-compliant devices such as keyboards, mice, storage keys, and peripherals to the system. All PowerEdge systems have at least 2 front-accessible USB 2.0 compliant ports spaced to accommodate full usage of both connectors simultaneously with other front panel features (e.g., Video connector, buttons, LEDs) without mechanical interference. These ports must be connected to the same controller and cannot be shared with internal or back USB ports.

For security, all external USB ports have an enable/disable function. Internal USB ports connected to internal persistent storage devices have an enable/disable function independent of the other ports in the system.

Except for platforms using chipsets that allow independent control to enable/disable each USB controller, disabling USB controllers observe the hierarchy detailed in Table 7 (listed from lowest to highest priority in a 3-controller design).

	Table 7.	USB Controller Priorities
USB Controller	Function		If disabled
3	Front USB		No other controller is disabled
2	Back USB		Controller 3 is disabled as well
1 (Highest)	Remote Access (RAC)		Controllers 2 & 3 are disabled as well

PowerEdge R510 Technical Guide 22