User manual QUANTUM DAT 160 03-2007

[. . . ] User's Guide User's Guide User's Guide User's Guide User's Guide User's Guide DAT 160 DAT 160 81-81794-01 A01 Quantum DAT 160 User's Guide, P/N 81-81794-01 A01, March 2007. COPYRIGHT STATEMENT Copyright 2007 by Quantum Corporation. Your right to copy this manual is limited by copyright law. Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law. [. . . ] 2 Perform a normal system shutdown and turn off the server and any connected peripherals. 3 Attach the VHD connection on the SCSI cable to the server's external SCSI connector and secure it by tightening the screws. Figure 18 Connecting the SCSI Cable LVD SCSI terminator 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. Quantum DAT 160 User's Guide 30 Chapter 3 Installing External Tape Drives Checking SCSI Termination Why Does the Tape Drive Need a Terminator? 3 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 Checking SCSI Termination for more information about SCSI cables and termination. Checking SCSI Termination If the external tape drive is the last or only device in the SCSI chain, install a terminating plug on the unused SCSI connector on the drive's back panel. This terminator typically is a small, rectangular plastic block that is marked SCSI Terminator. Figure 19 shows two examples of using SCSI termination. Quantum DAT 160 User's Guide 31 Chapter 3 Installing External Tape Drives Connect the Power Cable Figure 19 Two SCSI Termination Examples for the External Tape Drives External SCSI device SCSI Terminators External Tape Drive External Tape Drive External SCSI device SCSI Controller (termination disabled) SCSI Controller (termination enabled) Example 1: SCSI termination in a system that has only external SCSI devices. Internal SCSI device (termination enabled) Example 2: SCSI termination in a system that has both internal and external SCSI devices. Connect the Power Cable An external Quantum DAT 160 drive will operate using any voltage in the range 100­240 volts (0. 7 A, 50-60 Hz). To connect your drive to the power supply, proceed as follows: 1 Make sure that the drive is switched OFF (O side down). 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. Quantum DAT 160 User's Guide 32 Chapter 3 Installing External Tape Drives Completing Your Installation Figure 20 Connecting the Power Cable Power Cable Completing Your Installation To complete and test your external tape drive installation: 1 Reconnect the power cord to the computer's power connector. 2 Use the On/Off Switch on the back of the external tape drive to turn on the drive (see figure 20). The Ready LED should be ON, the other three front-panel LEDs should be OFF. The documentation that came with your software should describe this procedure. 5 Gently insert a tape cartridge into the external tape drive's slot. Slide the cartridge into the slot until the drive accepts the cartridge and loads it. A brief delay occurs while the drive identifies the cartridge type and state, and moves the tape to the data area. [. . . ] But how fast or often the data is transmitted is not as important as the accuracy of the data. The host will give network bandwidth priority to periodic devices and will share any remaining bandwidth equally among any active bulk transfer devices. USB supports many types of devices and three data transfer rates, low speed, full speed, and high speed. (A keyboard does not need to transfer data to the system at the same speed as a cable modem. ) The transfer speed capabilities of a device are often referred to by the USB specification revision in which the transfer rate was defined. [. . . ]