IBM 86607SU Hardware Maintenance Manual - Page 174

Input/Output ports and connectors: The input/output (I/O) connectors are for attaching external devices, such as printers, keyboards, and displays, to the server. The I/O connectors on the server include: Two serial-port connectors One systems management connector One parallel-port connector One video-port connector One keyboard-port connector One auxiliary-device-port connector One Ethernet-port connector Two USB-port connectors See the illustration in "Input/Output connectors and expansion slots" on page 194 for the locations of the connectors. Serial ports: The server comes with two serial ports. (See "Input/Output connectors and expansion slots" on page 194 for the locations of the connectors.) These ports are used to communicate with printers, plotters, external modems, scanners, and auxiliary terminals. These ports also enable you to transfer data between computers. Serial ports can transfer data asynchronously, which means that they can transmit any number of characters at any time, with no restriction on the duration of the pauses between characters. The serial ports can transmit and receive data and commands at rates of from 300 bits per second up to 115 000 bits per second. Serial port A is shared by the operating system and the integrated system management processor. Serial port B can be used by only by the operating system. Each serial port has a 9-pin, male D-shell connector on the back of the server. The pin-number assignments of this connector conform to the industry standard. 1 5 6 9 The following table shows the pin-number assignments for the serial-port connectors. Table 2. Serial Port Pin-Number Assignments Pin Signal 1 Data carrier detect 2 Receive data 3 Transmit data 4 Data terminal ready 5 Signal ground Pin Signal 6 Data set ready 7 Request to send 8 Clear to send 9 Ring indicator 166 Netfinity Server HMM