Quantum 4000 Enhanced, Installation And Operation Manual

Page: 38 / 88

4-6 Installation
62-0162-01
Count each device's SCSI ID in sequence 0 to 7 (or 0 to 15),
on each SCSI bus to confirm that no two devices have the
same ID.
Check the SCSI Bus Termination
SCSI buses require termination at each end for proper
operation. A typical external subsystem installation would be
terminated at the SCSI host adapter and at the last device in
the chain.
If an external device is being used with an internal device (on
the same channel), the SCSI host adapter would now be in the
middle of the bus rather than at the end. In this case, the
termination would be at the internal device and the last drive
in the external chain. The terminators on the SCSI host
adapter would be removed. See your SCSI host adapter
manual for directions on removing the terminators on the
board.
Is there a terminator installed on each end of the SCSI bus?
Note
The SCSI Host
Adapter is
normally set to
SCSI ID 7, so this
ID is usually not
available for a
device.
Note
For single-ended
drives,
recommends
using an active
single-ended
SCSI terminator.
For differential
drives, use a
passive
differential
terminator.