Installing options 69

USB cables and hubs

You need a 4-pin cable to connect devices to USB 1 or USB
2. If you plan to attach more than two USB devices, you
must use a hub to connect the devices. The hub provides
multiple connectors for attaching additiona l external USB
devices.
USB technology provides up to 12 megabits-per-second
(Mbps) speed with a max imum of 12 7 external dev ices and
a maximum signal distance of five meters (16 ft.) per seg-
ment.

USB-port connecto rs

Each USB port has an external connector on the rear of the
server for attaching USB compatible devices.
The following table shows the pin-number assignments for
the USB-port connectors on the rear of the server .

Ethernet port

The server comes with an integrated Ethernet controller.
This controller provides an interface for connecting to 10-
Mbps or 100-Mbps networks and provides full-duplex (FDX)
capability, which enables simultaneous transmission and
reception of data on the Ethernet local area network (LAN).
To access the Ethernet port, connect a Catego ry 3, 4 or 5
unshielded twisted-pair (UTP) cable to the RJ- 45 connector
on the rear of the server.
Note: The 100BASE-TX Fast Ethernet standard requires
that the cabling in the network be Category 5 or
higher.

Configuring the Ethernet controller

When you connect the server to the network, the Ethernet
controller automatically detects the data-transfer rate
(10Mbps or 100Mbps) on the network and then sets the
controlle r to operate at the ap propri ate r ate. That is, the
Ethernet controlle r will adjust to the network d ata rate,
whether the data rate is standard Ethernet (10BASE-T), Fast
Ethernet (100BASE-TX), half duplex (HDX), or full duplex
(FDX). The controller supports half-duplex (HDX) and full-
duplex (F DX) modes at both spee ds.
The Ethe rnet controller is a PCI Plu g and Pla y device. You
do no t n ee d to s et an y j umper s o r co nf ig ure th e c ontr o ller f or
the op er ati ng sy st em befo r e y ou us e the E t hern et c on tro ll er.
However, you mus t inst all a devic e driver to enable the oper-
ating system to address the Ethernet controller. The device
drivers are provided on the Serv erGuide CDs.

Table 13. USB -port connector pin-number a ssignments

Pin Signal
1VCC
2-Data
3+Data
4Ground