Ultra2 SCSI provides a solution to the cable length and device attachment limits through Low Voltage Differential signaling100. It increases the transfer rate while retaining compatibility with older non-Ultra2 (single-ended) devices. Ultra2 LVD configurations allow up to12.5 meters of bus length and allow the attachment of up to 15 devices. In order to operate in LVD mode, all devices attached to the bus must be LVD devices. Otherwise, the protocol automatically defaults to the single-ended Ultra SCSI mode.
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