Technical data

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Chapter 1: Introducing the DLT2000XT Tape Drive and DLT2500XT Stacker
Connection and Termination Guidelines
Each desktop DLT2000XT drive or DLT2500XT stacker comes with SCSI interface cables
for connecting to the host system, as shown in Figure 1-3 and Figure 1-5, respectively.
The sled-mounted DLT2000XT tape drives install directly into the host system SCSI box
or drive rack and do not require external cabling or termination procedures. See
Chapter 2 for configuration information on the sled-mounted drives.
For the Challenge L or XL and the Onyx deskside or rackmount, each desktop
DLT2000XT tape drive and DLT2500XT stacker includes a 12-foot (3.7-m) cable. This
cable has a 68-pin high-density connector on one end for connecting to a rackmount or
deskside host, and a 50-pin connector on the other end for connecting to the back of the
desktop DLT2000XT tape drive. The DLT2500XT stacker comes with an additional
3.3-foot (1.0 m) daisy-chaining cable for connecting two differential units together.
For the Indy or Indigo
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workstation, each desktop DLT2000XT tape drive includes a
one-meter (3.3-foot) cable with a high-density 50-pin connector for the host, and a
Centronics 50-pin connector for the desktop DLT2000XT tape drive.
Caution: The single-ended desktop DLT2000XT tape drive is limited to a total SCSI
cable length of 19.6 feet (6 m) when connected to Silicon Graphics desktop or deskside
systems. Never connect the desktop DLT2000XT drive to a host system with any cable
combination that exceeds 19.6 feet (6 m), including any internal cable length. Doing so
may result in SCSI bus errors or data loss. Consult your system owner’s guide for specific
SCSI bus requirements.
No additional SCSI devices should be daisy-chained to the back of the desktop
DLT2000XT tape drive; performance can be adversely affected. Always place the
single-ended active terminator on the top SCSI connector of the desktop DLT2000XT tape
drive, or SCSI errors may result. One additional stacker can be daisy-chained to a stacker,
The desktop DLT2000XT drive uses a single-ended SCSI terminator (shipped with each
unit). This terminator is not interchangeable with the differential terminator installed on
the DLT2500XT stacker.
Pinouts for a host system’s 68-pin single-ended, 50-pin single-ended, or 68-pin
differential SCSI connector are in Appendix A, “Hardware Specifications.”