HP Q1581A HP StorageWorks DAT SCSI Tape Drives user guide (Q1573 - 90905, Febr - Page 31

Connect the power cable, Why does the tape drive need a terminator?

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1. LVD SCSI terminator Figure 13 Connecting the SCSI cable 4. Attach the HD connection on the SCSI cable to one of the SCSI connectors on the rear panel of the tape drive and secure it by tightening the screws. 5. Connect the LVD terminator to the drive's other SCSI connector and tighten the screws to secure it. Why does the tape drive need a terminator? Terminators are essential, as they provide the correct voltages on the SCSI bus and prevent unwanted signal reflections from interfering with data transfers. The rule is: There must be termination at both physical ends of the bus and only at the ends. Normally the HBA forms one end of the SCSI bus and provides termination. You, therefore, need to ensure that the other end of the bus is terminated. If the tape drive is at the end of the SCSI bus, the terminator must be attached to the tape drive. If you want to attach additional devices to the SCSI bus after the tape drive, you will need to remove the SCSI terminator and attach the next device to this SCSI connector. Make sure that you attach the terminator to the last device in the chain. Always use an LVD terminator (supplied with the tape drive) or a multimode terminator. See "SCSI termination" on page 65 for more information about SCSI cables and termination. Connect the power cable An external HP StorageWorks DAT drive will operate using any voltage in the range 100-240 volts (0.7 A, 50-60 Hz). No adjustment is needed. To connect your drive to the power supply, proceed as follows: 1. Make sure that the drive is switched OFF (O side down). The power switch is on the rear panel. 2. Plug the power cable securely into the socket on the rear panel of the drive. 3. Plug the other end of the power cable into the power outlet. DAT SCSI Tape Drives 31

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1. LVD SCSI terminator
Figure 13 Connecting the SCSI cable
4.
Attach the HD connection on the SCSI cable to one of the SCSI connectors on the rear panel of the
tape drive and secure it by tightening the screws.
5.
Connect the LVD terminator to the drive’s other SCSI connector and tighten the screws to secure it.
Why does the tape drive need a terminator?
Terminators are essential, as they provide the correct voltages on the SCSI bus and prevent unwanted
signal re
fl
ections from interfering with data transfers. The rule is:
There must be termination at both physical ends of the bus and only at the ends.
Normally the HBA forms one end of the SCSI bus and provides termination. You, therefore, need to
ensure that the other end of the bus is terminated. If the tape drive is at the end of the SCSI bus, the
terminator must be attached to the tape drive.
If you want to attach additional devices to the SCSI bus after the tape drive, you will need to remove
the SCSI terminator and attach the next device to this SCSI connector. Make sure that you attach the
terminator to the last device in the chain.
Always use an LVD terminator (supplied with the tape drive) or a multimode terminator. See
“
SCSI termination
” on page 65 for more information about SCSI cables and termination.
Connect the power cable
An external HP StorageWorks DAT drive will operate using any voltage in the range 100–240 volts (0.7
A, 50-60 Hz). No adjustment is needed. To connect your drive to the power supply, proceed as follows:
1.
Make sure that the drive is switched OFF (O side down). The power switch is on the rear panel.
2.
Plug the power cable securely into the socket on the rear panel of the drive.
3.
Plug the other end of the power cable into the power outlet.
DAT SCSI Tape Drives
31