5-16 www.hp.com Technical Reference Guide
Input/Output Interfaces
5.9 Network Interface Controller
These systems provide 10/100/1000 Mbps network support through a Broadcom BMC5754
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 Network Interface Controller includes the following features:
■ VLAN tagging with Windows XP and Linux
■ Multiple VLAN support with Windows XP
■ Power management support for ACPI 1.1, PXE 2.0, WOL, ASF 1.0, and IPMI
■ Cisco Etherchannel support
■ Link 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.
The NIC uses 3.3 VDC auxiliary power, which allows the controller to support Wake-On-LAN
(WOL) and Alert-On-LAN (AOL) functions while the main system is powered down.
✎
For the features in the following paragraphs to function as described, the system unit must be
plugged into a live AC outlet. Controlling unit power through a switchable power strip will, with
the strip turned off, disable any wake, alert, or power mangement functionality.
Broadcom
LAN I/F
Green LED
NIC
RJ-45
Connector
Yellow LED
Tx/Rx Data
Tx/Rx Data
LED
Function
Green
Yellow
Activity/Link. Indicates network activity and link pulse reception.
Speed: Off = 10 Mb/s, yellow = 100Mb/s, green = 1 Gb/s.
BMC5754
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