HP Compaq NC3123 Fast Ethernet NIC PCI Adapter - Manual (Page 10)

1-2 Compaq NC3123 Fast Ethernet Server Adapter User Guide
NC3123 Connector
The Compaq NC3123 Server Adapter has one RJ-45 port and auto-negotiates 10 or 100 Mb/s,
full- or half-duplex depending on the device to which it is connected.
Figure 1-1. Compaq NC3123 Server Adapter
For information about connecting cables, see “Connecting the Network Cable” in Chapter 2.
IMPORTANT: If you are using the NC3123 Server Adapter in a residential environment, you must use a
Category 5 (or better) cable.