Sun Microsystems Ultra 1 Creator Series Service Manual page 193

A maximum of 15 devices (3 internal and 12 external) may be daisy-chained
through a maximum cable length of 19.69 feet (6 meters). An internal cable length
of approximately 35 inches (90 centimeters) must be accounted for in the total
cable length.
A maximum of five CD-ROM drives in DSP enclosures or a maximum of four
CD-ROM drives in Togo enclosures are allowed. The number is reduced by one if
there is an internal CD-ROM drive.
A maximum of two tape drives are allowed if disk drives or CD-ROM drives
reside on the same bus. If there are no disk drives or CD-ROM drives, an
additional tape drive is allowed.
SCSI target address 7 is reserved for the onboard SCSI host adapter (FEPS).
SCSI target address 0 and target address 1 are automatically assigned to the
internal SCSI disk drives when installed and SCSI target address 6 is
recommended for the internal CD-ROM drive. SCSI target address 4 or 5 is
recommended for the internal tape drive.
The end of the daisy chain must be terminated with an active terminator.
Note – Certain devices, such as devices mounted within desktop storage enclosures,
provide automatic termination.
If both 50-pin and 68-pin external devices are connected externally, the
68-pin device must be connected earlier in the daisy chain. A special terminator/
adapter, which terminates the extra signals and converts the extra signals into a
50-pin configuration, is available for the last 68-pin device. The last 50-pin device
must be terminated.
C.1.6.5 Optional 2.5-Gbyte, 4-mm, and 8-mm Tape Drives
The system unit or server supports the optional 2.5-Gbyte, 4-mm, and 8-mm tape
drives. Either the 2.5-Gbyte tape drive, 4-mm tape drive, or 8-mm tape drive may be
installed in the system/server unit in lieu of the CD_ROM drive.
2.5-Gbyte Tape Drive
The 2.5-Gbyte tape drive is a 1/4-inch tape drive that is equipped with an intelligent
controller and an embedded SCSI-type interface. The 2.5-Gbyte QIC Tape Drive
Specifications, document part number 802-3615, provides cleaning, jumper setting,
and tape cartridge instructions for the 2.5-Gbyte tape drive.
Appendix C Functional Description C-7