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24 AP100 Hardware Reference Guide
II. System Components
II. Components
Ultra2 SCSI Disk
Ultra2 SCSI Disk Drive
The Ultra2 SCSI disk drive has separate signal and power connections. The
power connector is the same as standard hard disk drive power. The signal
cable is different. For proper signal stability in Ultra2 speeds, a special twisted
ribbon cable must be used. Each two wires are twisted for signal shielding
like that of high speed (e.g. category 5) LAN cabling.
External SCSI Terminator
In order to prevent SCSI signal loss, the provided external SCSI terminator
must be used at the end of the 68pin SCSI cable. 50 pin SCSI cables may
also use terminators but usually use termination jumpers on the device it-
self. Currently Wide-SCSI devices have termination jumpers but Ultra2
devices do not. Some manufacturers ship SCSI devices with the terminator
set, others do not. All termination jumpers must be removed when using the
external SCSI terminator.
Ultra2 SCSI hard disk drive connections
Red stripe of signal cable
Red stripe of power cable
Ultra2 SCSI ribbon cable terminator