IBM eServer xSeries 235 Type 8671, Техническое обслуживание и устранение неисправностей

Страница: 119 / 214

Universal Serial Bus version 1.1 ports
Your server has one Universal Serial Bus (USB) version 1.1 connector on the front
of the server and two USB version 1.1 connectors on the rear of the server.
USB is a serial interface standard for telephony and multimedia devices. It uses
Plug and Play technology to determine the type of device that is attached to the
connector.
Notes:
1. If you attach a standard (non-USB) keyboard to the keyboard connector, the
USB ports and devices will be disabled during the power-on self-test (POST).
2. If you install a USB keyboard that has a mouse port, the USB keyboard
emulates a mouse, and you will not be able to disable the mouse settings in the
Configuration/Setup Utility program.
3. Check to make sure that your NOS supports USB devices.
4. For additional information about USB version 1.1 devices, go to
http://www.usb.org/.
USB cables and hubs
You need a 4-pin cable to connect USB devices. If you plan to attach more than
three USB devices, you must use a hub to connect the devices. The hub provides
multiple connectors for attaching additional external USB devices.
USB technology provides up to 12 Mb-per-second (Mbps) speed with a maximum of
127 devices and a maximum cable length of five meters (16 ft).
USB-port connectors
Each USB port has an external connector on the front and rear of the server for
attaching USB compatible devices.
The following illustration shows the USB-port connectors on the front and rear of
your server. These connectors conform to the USB version 1.1 standard.
1 4
Gigabit Ethernet port
Your server comes with an integrated Gigabit Ethernet controller. This controller
provides an interface for connecting to 10-Mbps, 100-Mbps, or 1000-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 connector, connect a Category 3, 4, or 5 unshielded
twisted-pair (UTP) cable to the Ethernet (RJ-45) connector on the rear of your
server. See “System-board external port connectors” on page 46.
Note: The 100BASE-TX Fast Ethernet standard and1000BASE-T standard require
that the cabling in the network be Category 5 or higher.
The Ethernet (RJ-45) connector has one LED that indicates Ethernet-link status.
When this green LED is on, there is an active connection on the Ethernet port.
Chapter 4. Customer replaceable units
109