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CHAPTER 3: Installation
3. Installation
Install the SCSI Switch II as a standalone desktop unit. The Switch gets its
power through its external power supply.
3.1 Preinstallation Guidelines
Before you install the SCSI Switch II, make sure that the total length of any
of the three possible data paths does not exceed 6 meters (19.7 feet) for 8-bit
SCSI-1 and SCSI-2 or 3 meters (9.8 feet) for 16-bit SCSI-2 and SCSI-3. This is
the maximum allowed by SCSI specification, and it is fully attainable; though
“active” (automatic) switches introduce load on the bus and reduce the
maximum length of cable you can run, the SCSI Switch II is a “passive” device
and does not subtract from this limit.
When you attach a SCSI adapter cable to the Switch, you must make sure
that Pin 1 on the cable’s connector goes to Pin 1 on the Switch’s connector.
3.2 Installing the Switch
To set up the SCSI Switch II on a desktop or otherwise outside of a system
cabinet, follow these steps:
1. Find a clear, uncluttered location away from obvious dangers, such as
liquids and high temperatures.
2. Attach the main host bus cable to the connector marked “INPUT.” Make
sure Pin 1 on the cable connector is aligned with Pin 1 of the Switch
connector.
3. Attach the branch bus cables to the respective branch connectors (“A,”
“B,” and “C”), using SCSI adapter cables if necessary. Again, make sure
Pin 1 on each cable connector is aligned with Pin 1 on the corresponding
Switch connector.
4. Plug the input cord of the Switch’s power supply into the power jack on
the rear of the Switch, then plug the power supply into a working outlet.
