Network Controller - NEC Express5800/120Rd-2 Service Manual

1-20 System Overview

Network Controller

To ensure EMC product regulation compliance, the system must
NOTE:
be used with a shielded LAN cable.
The system board uses two Intel ® 82550PM Fast Ethernet Controllers and supports two
10Base-T/100Base-TX network subsystems.
The 82550 PM 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.
!
On the system board, NIC 1 can be used as both a network interface and server management
interface.
NIC Connector and Status LEDs
The 82550 controller drives LEDs on the network interface connector that indicate link/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.