Intel DH55TC User Manual

Technical Reference
47
2.2.2.4.2 Reset Switch Header
Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type
switch that is normally open. When the switch is closed, the board resets and runs the
POST.
2.2.2.4.3 Power LED Header
Pins 2 and 4 can be connected to a one- or two-color LED. Table 24 shows the default
states for thi
s LED. More options are available through BIOS setup.
Table 24. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Lit Running
Blink Standby
2.2.2.4.4 Power Switch Header
Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The
switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power
supply to switch on or off. (The time requirement is due to internal debounce circuitry
on the board.) At least two seconds must pass before the power supply will recognize
another on/off signal.
2.2.2.5 Auxiliary Front Panel Power LED Header
Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 25. Auxiliary Front Panel Power LED Header
Pin Signal Name In/Out Description
1 FP_LED+ Out FP_LED+
2 Not connected
3 FP_LED− Out FP_LED−

Intel DH55TC Specifications

Add-in Card Connectors

PCI Express 2.0 x16 transfer speed	8 GB/s
PCI Express 2.0 x1 transfer speed	250 MB/s
Conventional PCI connectors count	1

Front Panel USB Headers

USB 2.0 specification compliance	Yes
+5 V DC power on USB headers	Fused
USB Header 2 Pin 10 routing	HDD LED