Connecting An External Scsi Device - Intergraph InterServe 80 SL System Setup

16

Connecting an External SCSI Device

CAUTION On systems with SCSI configurations, the external controller port on the system's SCSI
controller is non-functional and can cause unexpected behavior. This section briefly explains
how to connect an external SCSI device to an optional SCSI adapter card.
If your system includes an optional SCSI adapter card, you can connect external SCSI devices
(such as tape drives) to the external port on the optional SCSI adapter card.
The optional SCSI adapter card is designed to support Ultra Wide SCSI devices. Ultra Wide
SCSI provides a maximum data transfer rate of 40 MB per second. If you connect a non-Ultra
Wide SCSI device to the adapter, data transfer rates are limited to the speed of that device.
CAUTION Using a non-compliant SCSI-1 device with your system may cause your system to stop
working or lead to other unpredictable results.
You can connect up to seven external single-ended SCSI devices to an installed SCSI adapter.
However, the number of drives and length of the cables used to connect the drives is a factor
when using SCSI-1, Fast SCSI (SCSI-2), Ultra SCSI, and Wide Ultra SCSI drives. Fast SCSI,
Ultra SCSI, and Wide Ultra SCSI impose shorter cable restrictions than SCSI-1.
The total length of the SCSI cabling must not exceed the following:
Drives
1 to 4
5 to 7
NOTE You must count the SCSI adapter as one device.
NOTE Make sure the last device on a chain of external SCSI devices has an active SCSI terminator
connected to the open SCSI port. All other external SCSI devices must have SCSI
termination disabled or removed.
See the SCSI adapter documentation delivered with the system for more detailed information
on the SCSI adapter and connecting SCSI devices to it.
SCSI-1 Fast SCSI-2
19.8 ft 9.9 ft
(6 meters) (3 meters)
9.9 ft 9.9 ft
(3 meters) (3 meters)
Ultra SCSI Wide Ultra SCSI
9.9 ft 9.9 ft
(3 meters) (3 meters)
4.5 ft 4.5 ft
(1.5 meters) (1.5 meters)