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Enterprise Tape Library 4/1000 Installation Guide for Sun Systems—January 1997
Figure 3 Maximum Differential SCSI Bus Length
Computing SCSI Bus Lengths
When connecting the ETL 4/1000 to your system, find the total SCSI bus length
for your configuration. To do this, add the length of the internal bus lengths of
each device of the system to the length of the external SCSI cable. The length of
the SCSI bus inside the ETL 4/1000 is 2 meters.
If the SCSI bus length exceeds 24 meters, or you have to install more than 15
SCSI devices, you can install some of the devices on additional SCSI buses by
installing a DWIS SCSI Host Adapter card with desktop systems or with
deskside systems. The SCSI Host Adapter card provides an additional SCSI
port (SCSI bus) for your system.
Terminating SCSI Devices
You must attach a regulated SCSI terminator to the SCSI port at the end of the
SCSI bus. A terminator holds the bus at a predetermined signal level when the
bus is not active and maintains impedance matching.
Host
SCSI peripheral
SCSI peripheral
SCSI peripheral
max. 24 meters
