Seagate ST12550N/ND/W/WD, ST11950N/ND/W/WD manual Terminator power, Termination is supplied

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.

J01 location on “N”
and “ND” drives
J01	Pin
	2
Pin 1
Pin 3
	Pin
	4
Terminator power options.	J4
These jumpers determine how
termination is supplied.

J01 location on “W”

and “WD” drives

J01

Pin 1

J4

* 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.

* Valid for single-ended (“N” and “W”) drives only.

Figure 8. Setting terminator power jumpers