II. System Components

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.

Components .II

Disk SCSI Ultra2

Red stripe of signal cable

Red stripe of power cable

Ultra2 SCSI hard disk drive connections

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 ribbon cable terminator

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AP100 Hardware Reference Guide