IBM eServer xSeries 345 Type 8670, Maintenance Manual

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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 or rear of the server for
attaching USB-compatible devices.
The following illustration shows a USB-port connector. These connectors conform to
the USB version 1.1 standard.
1 4
Ethernet ports
Your server comes with an integrated dual-port Ethernet controller. This controller
provides an interface for connecting to 10-Mbps, 100-Mbps, or 1000-Mbps networks
and provides full-duplex capability, which enables simultaneous transmission and
reception of data on the Ethernet LAN.
To access the Ethernet controller, connect a Category 5, or higher, unshielded
twisted-pair (UTP) cable to either of the Ethernet (RS-45) connectors on the rear of
your server. See “System-board external port connectors” on page 46.
Ethernet connectors
There are two RS-45 Ethernet connectors on the back of the server. See
“System-board external port connectors” on page 46 for the location of these
connectors.
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Integrated system management ports
The RS-485 connectors are used for the ISMP interconnect function. The ISMP
interconnect function uses these connectors to daisy-chain several system service
processors together. This function enables the service processors to communicate
with each other in half-duplex mode.
Chapter 4. Customer replaceable units
77