Universal Serial Bus Ports - IBM xSeries 240 81Y Hardware Maintenance Manual

1
RJ-45 modular plug connector
2
3
Pins
6
Table 9. Ethernet port pin-number assignments
Pin Signal
1 Transmit data+
2 Transmit data−
3 Receive data+
4 Reserved

Universal serial bus ports:

xSeries 240 server contains two universal serial bus (USB)
ports. Each USB port has an external connector on the
rear of the server for attaching devices that previously
used serial, parallel, keyboard, mouse, and game ports.
USB is an emerging serial interface standard for telephony
and multimedia devices. USB technology uses Plug and
Play technology to determine what device is attached to
the connector. Each USB device is accessed by a unique
USB address. A device called a hub is used to convert the
USB port into multiple attachment points. A hub has
multiple ports where peripherals can be attached. USB
provides 12 megabits-per-second (Mbps) bandwidth with a
maximum of 63 peripherals and a maximum signal
distance of five meters (16 ft.) per segment.
Note
If more than one USB device is to be attached, then
the device must be connected to a hub.
Table 10 shows the pin-number assignments for the USB
connectors.
Table 10. USB port pin-number assignments
Pin Signal
1 VCC
−Data
2
+Data
3
4 Ground
148
xSeries 240 HMM
10BASE-T or 100 BASE-TX
UTP cable
Pin Signal
5 Reserved
6 Receive data−
7 Reserved
8 Reserved
The system board in the