Ethernet port:
The system board in the Netfinity 5500
M20 contains an Ethernet
controller. The controller has an
external RJ-45 connector on the rear of the server that is
used with a category 3, 4, or 5 unshielded twisted-pair
(UTP) cable. The connector enables an Ethernet network
to attach to the internal transceiver in the server.
Note
The 100BASE-TX Fast Ethernet standard requires that
the cabling in the network be Category 5 or higher.
See “Configuring the ethernet controller” on page 35 for
additional information about the Ethernet controller.
Table 8 shows the pin-number assignments for the RJ-45
connector. These assignments apply to both 10BASE-T
and 100BASE-TX devices.
10BASE-T or 100 BASE-TX
UTP Cable
RJ-45 Modular Plug Connector
1
2
3
Pins
6
Universal serial bus ports:
The system board in the
Netfinity 5500 M20 contains two universal serial bus (USB)
ports. Each USB port has an external connector on the
rear on 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 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.
Table 8. Ethernet connector pin-number assignments
Pin
Signal
Pin
Signal
1
Transmit data
+
5
Reserved
2
Transmit data
−
6
Receive data
−
3
Receive data
+
7
Reserved
4
Reserved
8
Reserved
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