NEC Express 5800/140Rb-4, Service Manual

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Network Interface Controllers
✏
NOTE
To ensure EMC product regulation compliance, the system must be used
with shielded LAN cables.
The baseboard includes two network interface controllers (NICs):
•
Intel 82550 NIC that supports 10Base-T and 100Base-TX networks
•
Intel 82544 NIC that supports 10Base-T, 100Base-TX networks, and 1000BASE-T networks
The 82550 controller supports the following features:
•
32-bit PCI, CardBus master interface
•
Integrated IEEE 802.3 10Base-T and 100Base-TX compatible PHY
†
•
IEEE 820.3u auto-negotiation support
•
Chained memory structure similar to the 82559, 82558, 82557 and 82596
•
Full duplex support at both 10 Mbps and 100 Mbps operation
•
Low power +3.3 V device
•
IP checksum off-loading
NIC 1 can be used as both a network interface and server management interface.
The 82544 controller supports the following features:
•
Direct 32/64-bit, 33/66-MHz interface to the PCI bus
•
Integrated IEEE 802.3 1000BASE-T, 100BASE-TX, and 10BASE-T
•
Integrated third-generation MAC and proven IEEE 803.3ab compatible PHY
•
Full duplex support for 10-Mbps, 100-Mbps, and 1000 Mpbs operation
•
Descriptor ring management architecture optimized to deliver both high performance and
PCI/PCI-X bus efficiency
•
Low power +3.3 V device
•
IP and TCP/UDP checksum off-loading
NIC Connector and Status LEDs
The NICs drive LEDs on the network interface connectors that indicate link connection and activity
on the LAN and 10- or 100-Mbps operation. The green LED indicates network connection when
on and TX/RX activity when blinking. The yellow LED indicates 100-Mbps operation when lit.