IBM 86802SY Hardware Maintenance Manual - Page 109

Input/Output Ports and Connectors: The input/output (I/O) connectors are for attaching external devices, such as printers, keyboards, and displays, to your server. The I/O connectors on your server include: Two serial-port connectors One parallel-port connector One video-port connector One keyboard-port connector One auxiliary-device-port connector One external UltraSCSI-port connector Two USB-port connectors One System Management 10/100 Ethernet port connector One dual serial-port connector One RS 485 bus connector Refer to the illustration in "Input/Output Connectors and Expansion Slots" on page 121 for the locations of the connectors. Serial Port: Your server comes with two serial ports. (Refer to "Input/Output Connectors and Expansion Slots" on page 121 for the locations of the connectors.) These ports are used to communicate with printers, plotters, external modems, scanners, and auxiliary terminals. You can also use these ports to transfer data between computers. Serial ports transfer data one bit at a time, using direct memory access (DMA). DMA is a method of transferring data between I/O devices and system memory without intervention by the system microprocessor. 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 345 600 bits per second. To use a serial port at 345 600 bits per second, you need a shielded serial cable. 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. Netfinity 7000-M10 - Type 8680 101