What are the differences between SE “Single Ended” SCSI and LVD “Low Voltage Differential” SCSI?
SE vs. LVD devices: • These terms refer to the type of electrical signals used on the cable: SE = “single ended”; LVD = “low voltage differential”. LVD has much better noise immunity at all speeds. • 40 MB/s vs. 320 MB/s speed limit. • A SCSI bus can only be SE or LVD. • Unlike old AMOS systems, the AM-8000 has two SCSI busses (channels “A” and “B”), allowing both SE and LVD. • Some of the disks, tape drives, and RAIDs we have been selling recently can operate in either LVD or SE mode and may run faster on the LVD bus. On the other hand, some situations may benefit from using both busses as LVD and splitting the SCSI traffic between the two LVD buses. • Both channels can have .AMD and AMOS SCSI devices at the same time (see below), but that is not recommended.
