Fantom Drives MGT-08SC08A Installation Reference Manual page 31

Correct SCSI termination procedures require that the last devices on the SCSI
bus be terminated. If the last device is not terminated, or if devices other than
the last are terminated, erratic SCSI bus performance may occur. Typically, the
system or host adapter (SCSI card inside the PC) is the first device and is
already terminated. When installing the disk array on a SCSI bus with other
devices, be sure to observe the above rules with all devices on the SCSI bus.
Consult your system and/or host adapter manual for additional information on
correct termination procedure.
Note:
!
If you are connecting another external device after the subsystem,
make sure to disable the terminator at the subsystem's host channel
A & B out connector. The default host channel's terminator is
disabled.
Getting Started 2-9