IBM 8685 Hardware Maintenance Manual - Page 120

SCSI cabling requirements For information about the maximum length of SCSI cable, see the American National Standards Institute (ANSI) SCSI standards on the ANSI Web site at http://www.ansi.org/ on the World Wide Web. Adhering to these standards will help to ensure that your server operates properly. When you attach a SCSI device to the external SCSI connector, you must set a unique ID for the device. See the information that is provided with the device for instructions to set its SCSI ID. See "Setting SCSI IDs" on page 113 for additional information about SCSI IDs. Input/output connectors This section provides information about the input/output (I/O) connectors on the rear of your server. These connectors include the following: v One video port v One keyboard port v One auxiliary-device (pointing device) port v One serial port v Four Universal Serial Bus (USB) ports v One Ethernet port v Two ISMP (RS-485) ports The server system board contains two Ultra160 SCSI connectors. See "System-board internal cable connectors" on page 45 for the SCSI connector locations. The following illustration shows the I/O ports on the rear of your server. ISMP A ISMP B External SCSI cable knockout USB USB 1 and 2 3 and 4 Line cord 1 Line cord 2 Serial Video Mouse Ethernet Keyboard Notes: 1. The ISMP ports (ISMP A and B) are dedicated for use by the system-management subsystem. The ISMP ports are used for the RS-485 110 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide