Network Interface Controller - Compaq dc5850 - Microtower PC Technical Reference Manual

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.
Broadcom
BMC5754
LED
Green Activity/Link. Indicates network activity and link pulse reception.
Yellow Speed: Off = 10 Mb/s, yellow = 100Mb/s, green = 1 Gb/s.
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.
5-16
Tx/Rx Data
NIC
Function
Green LED
RJ-45
Connector
Tx/Rx Data
LAN I/F
Yellow LED
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