HP Q1581A HP StorageWorks DAT SCSI Tape Drives user guide (Q1573 - 90905, Febr - Page 69

If you connect only LVD SCSI devices

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• With low voltage differential (LVD) signaling, signals travel along two wires and the difference in voltage between the wire pairs determines the signal value. This enables faster data rates and longer cabling with less susceptibility to noise than SE signaling and reduced power consumption. If you use LVD SCSI devices on the same bus as single-ended devices this will switch the LVD SCSI host adapter into single-ended mode and restrict cable length. If you connect only LVD SCSI devices, the bus will operate in low voltage differential mode and Ultra160 speeds will be enabled. You can use a combination of Ultra160 and Ultra2 devices. Each device will operate at its optimum speed. DAT SCSI Tape Drives 69

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With low voltage differential (LVD) signaling, signals travel along two wires and the difference in
voltage between the wire pairs determines the signal value. This enables faster data rates and
longer cabling with less susceptibility to noise than SE signaling and reduced power consumption.
If you use LVD SCSI devices on the same bus as single-ended devices this will switch the LVD SCSI host
adapter into single-ended mode and restrict cable length.
If you connect only LVD SCSI devices, the bus will operate in low voltage differential mode and Ultra160
speeds will be enabled. You can use a combination of Ultra160 and Ultra2 devices. Each device will
operate at its optimum speed.
DAT SCSI Tape Drives
69