User Manual

Installation
Manual No. DB11-000024-00 2-3
* The Maximum number of devices allowed on a Wide Ultra SCSI bus is 8, unless bus
extender technology is used.
† This length can be extended to 25 meters if there are only 2 devices (e.g., the controller and
one drive) on the bus in a point-to-point configuration.
Safety Considerations
Be sure to observe the following precautions before beginning the controller
installation procedure:
 Caution
Anti-static handling procedures are required. Leave
the controller in its anti-static bag until it is time to
plug the controller into the PCI slot. The use of a
grounded wrist strap and other ESD protective
measures are highly recommended.
 WARNING
Disconnect the system from the electrical wall
outlet before opening the system cabinet. Working
with the system covers off and power applied to the
system can result in shock and serious injury.
Table 2-1. SCSI Formats and Bus Lengths
SCSI Trade Association
(STA) Terms
Bus
Speed,
MB/Sec,
Max.
Bus
Width,
Bits
Max. Bus Length, Meters Max. Device
Support
(Including
Controller)
Single-ended Low-Voltage
Differential
SCSI-1 5 8 6 - 8
Fast SCSI 10 8 3 - 8
Fast Wide SCSI 20 16 3 - 16
Ultra SCSI 20 8 1.5 - 8
Ultra SCSI 20 8 3 - 4
Wide Ultra SCSI 40 16 - - 16*
Wide Ultra SCSI 40 16 1.5 - 8
Wide Ultra SCSI 40 16 3 - 4
Ultra2 SCSI 40 8 Not Defined 12† 8
Wide Ultra2 SCSI 80 16 Not Defined 12† 16
Ultra 160 SCSI 160 16 Not Defined 12 16