Product Description
25
1.8 Real-Time Clock Subsystem
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the
computer is not plugged into a wall socket, the battery has an estimated life of three
years. When the computer is plugged in, the standby current from the power supply
extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC
with 3.3 VSB applied via the power supply 5 V STBY rail.
NOTE
If the battery and AC power fail, date and time values will be reset and the user will be
notified during the POST.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate. Replace the
battery with an equivalent one. Figure 1 on page 13 shows the location of the battery.
1.9 LAN Subsystem
The LAN subsystem consists of the following:
• Intel 82579V Gigabit Ethernet Controller (10/100/1000 Mb/s)
• Intel QS77 Express Chipset
• RJ-45 LAN connector with integrated status LEDs
Additional features of the LAN subsystem include:
• CSMA/CD protocol engine
• Jumbo frame support
• LAN connect interface between the PCH and the LAN controller
• Power management capabilities
ACPI technology support
LAN wake capabilities
• LAN subsystem software
LAN software and drivers http://downloadcenter.intel.com
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