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38 Barracuda 9 Installation Guide, Rev. B
W/WD drives
Terminating the drive
ST19171W drives are terminated with permanently mounted IC
active terminators. If you install one of these drives and it is not
on the end of the SCSI bus, disable the terminators by removing
the jumper from pins 15 and 16 of connector J2. If you install the
drive on the end of the SCSI bus, enable termination by installing
a jumper on pins 15 and 16 of connector J2 (see Figure 11).
Note.
Use active (ANSI SCSI-2 Alternative 2) terminators when
terminating the bus.
ST19171WD drives do not have internal terminators or any other
way of adding internal termination to the drive. You must provide
external differential termination to these drives when termination
is required.
Figure 11. Terminating the drive (ST19171W shown)
*Disable SCSI terminator
*ST19171W only
*Enable SCSI terminator (default)
T
E
D
S
M
E
W
P
P
D
R
E
S
T
P
T
P
SCSI I/O
Connector
DC Power
Connector
J2
Drive
Front
J6
J1
J2 Jumper Type
(enlarged to
show detail)
Pin 1
J2