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5-14 www.hp.com Technical Reference Guide
Input/Output Interfaces
5.8 Network Interface Controller
These systems provide 10/100/1000 Mbps network support through an Intel 82579LM GbE
network interface controller (NIC), a PHY component, and a RJ-45 jack with integral status
LEDs (Figure 5-10). The support firmware is contained in the system (BIOS) ROM. The NIC
can operate in half- or full-duplex modes, and provides auto-negotiation of both mode and speed.
Half-duplex operation features an Intel-proprietary collision reduction mechanism while
full-duplex operation follows the IEEE 802.3x flow control specification.
Figure 5-10. Network Interface Controller Block Diagram
The NIC includes the following features:
■ VLAN tagging with Windows XP and Linux
■ Multiple VLAN support with Windows XP (and later)
■ Power management support for ACPI 1.1, PXE 2.0, WOL, ASF 1.0, and IPMI
■ Adapter teaming including support for Cisco Etherchannel and open standard IEEE802.3ad
■ Speed and Activity LED indicator drivers
The controller features high and low priority queues and provides priority-packet processing for
networks that can support that feature. The controller's micro-machine processes transmit and
receive frames independently and concurrently. Receive runt (under-sized) frames are not passed
on as faulty data but discarded by the controller, which also directly handles such errors as
collision detection or data under-run.
Table 5-10. LAN LED Indications
Function Activity LED Speed LED
10 MB link Green (steady) Off
100 MB link Green (steady) Yellow (steady)
1000 MB link Green (steady) Green (steady)
10 MB data transfer Green (blinking) Off
100 MB data transfer Green (blinking) Yellow (steady)
1000 MB data transfer Green (blinking Green (steady)
Intel
LAN I/F
Activity (green) LED
NIC
RJ-45
Connector
Speed (yellow/green) LED
Tx/Rx Data
Tx/Rx Data
82579LM GbE