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SCSI Attachment
To communicate with a server, the IBM TotalStorage LTO Ultrium 2 Tape Drive uses
the Ultra160 LVD SCSI interface.
Physical Characteristics of the SCSI Interface
The Ultrium 2 Tape Drive contains a high-density, 68-pin, D-shell receptacle
connector (HD68) for attachment to the server. The HD68 connector includes the
connectors for the SCSI signal, the SCSI ID, and the drive’s power. The drive
supports LVD SCSI cables with HD68 connectors.
For a list of available cables, see Appendix A, “Tools and Supplies” on page 95.
Speed
The Ultra160 LVD SCSI interface is backward compatible with older SCSI
technology and is capable of data transmission at 160 MB/s. Ultra160 SCSI uses
the three management features of the Ultra3 SCSI standard that specifically affect
data transfer rate:
v Double transition clocking - a data-transfer technique that enables data rates
to double without increasing clock speed
v Domain validation - a procedure that detects and adjusts SCSI configuration
issues that might prevent interoperation between SCSI devices
v Cyclic redundancy check (CRC) - an error-checking technique
Because the cables, connectors, and terminators are the same for the Ultra160 and
Ultra2 SCSI interfaces, devices with those interfaces can be mixed on the same
bus and each device can operate at its fully rated speed.
4 IBM TotalStorage LTO Ultrium 2 Tape Drive