Asus P5B-MX P5B-MX user's manual - Page 39

2. USB device wake-up (3-pin USBPW1-4, USBPW56, USBPW78) Set these jumpers to +5V to wake up the computer from S1 sleep mode (CPU stopped, DRAM refreshed, system running in low power mode) using the connected USB devices. Set to +5VSB to wake up from S3 and S4 sleep modes (no power to CPU, DRAM in slow refresh, power supply in reduced power mode). The USBPW 12 and USBPW 34 jumpers are for the rear USB ports. The USBPW 56 is for the internal USB connectors that you can connect to additional USB ports. The USBPW 78 is for the WiFi-AP module. USBPW1-4 12 23 R P5B-MX/WiFi-AP +5V (Default) +5VSB USBPW78 12 23 +5V (Default) P5B-MX/WiFi-AP USB Device Wake Up +5VSB USBPW56 12 23 +5V (Default) +5VSB • The USB device wake-up feature requires a power supply that can provide 500mA on the +5VSB lead for each USB port; otherwise, the system would not power up. • The total current consumed must NOT exceed the power supply capability (+5VSB) whether under normal condition or in sleep mode. 3. Keyboard power (3-pin KBPWR) This jumper allows you to enable or disable the keyboard wake-up feature. Set this jumper to pins 2-3 (+5VSB) to wake up the computer when you press a key on the keyboard (the default is the Space Bar). This feature requires an ATX power supply that can supply at least 1A on the +5VSB lead, and a corresponding setting in the BIOS. KBPWR R P5B-MX/WiFi-AP 12 23 +5V (Default) +5VSB P5B-MX/WiFi-AP Keyboard Power Setting ASUS P5B-MX/WiFi-AP 1-27