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ST11950 and ST12550 Installation Guide, Rev. D 27
Terminator power
Single-ended (N and W) drives have four valid configu-
rations for terminator power (see Figure 8). Differential
(ND and WD drives) must be configured with a jumper
on J01 pins 1 and 3 only.
* Terminator power from the drive. The
drive provides its own terminator power.
* Terminator power from TERMPWR on the
SCSI bus.
Terminator power to the SCSI bus. The drive
supplies power to TERMPWR on the SCSI bus.
* Terminator power to the SCSI bus and drive.
J01
Terminator power options.
These jumpers determine how
termination is supplied.
J4
Pin 1
J01
J4
Pin 1
J01 location on “N”
and “ND” drives
J01 location on “W”
and “WD” drives
Pin 3
Pin
4
Pin
2
* Valid for single-ended (“N” and “W”) drives only.
Figure 8. Setting terminator power jumpers