IBM 86624RY Maintenance Manual - Page 201

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 1 23 Pins 6 RJ-45 Modular Plug Connector Table 8. Ethernet connector pin-number assignments Pin Signal 1 Transmit data+ 2 Transmit data− 3 Receive data+ 4 Reserved Pin Signal 5 Reserved 6 Receive data− 7 Reserved 8 Reserved 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. Netfinity 5500 M20 - Type 8662 193