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Cheetah 9 Installation Guide, Rev. B 45
W/WD drives
Terminating the drive
“W” model 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 “TE” 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 13).
Note. Use active (ANSI SCSI-2 Alternative 2) terminators when
terminating the bus.
“WD” model 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. See Figure 3d.
Figure 13. Terminating the drive (“W” model shown)
Disable Terminator
T
E
D
S
M
E
W
P
P
D
R
E
S
T
P
2
T
P
1
Enable Terminator (default)
J2
SCSI I/O
Connector
DC Power
Connector
J2
Pin 1
Drive
Front
J6
J1
Pin 1
Pin 2
J2 Jumper
(enlarged to
show detail)