Interface Cables
96122 • Revision: F Chapter 2 SCSI Bus Physical Description 9
The library supports the following cable types and specifications:
Note – If the SCSI bus uses an A-cable, you must use an adapter to terminate the
eight additional data lines in the P-cable. You then must use the P-cable to connect
the SCSI bus to the library and tape drives.
External
StorageTek supplies a variety of external SCSI bus cables to connect the library and
tape drives to the SCSI bus. Types of cables include:
■ 50-pin Centronics
■ 68-pin Micro D-type
■ 68-pin micro-centronix
■ 68-pin AS/400 recessed hardware
■ 68-pin RS6000 (2416 IOP)
■ 68-pin 4-40 hardware
Contact a marketing representative or refer to the system assurance guide for your
library for information about SCSI cables.
Daisy-Chain
The library and the tape drives may be daisy chained on the SCSI bus using short
SCSI cables. The library and the tape drives each have two SCSI connectors wired
in parallel. To daisy chain these devices, connect a SCSI cable from the bus to one
of the connectors; then connect a SCSI daisy-chain cable from the other connector
to the next device. Daisy-chain cables are available from StorageTek.
Note – If a device is first or last on the SCSI bus, then it must be terminated. See
“Terminator” on page 10 for information and part numbers.
Cable Type Description
P-cable The SCSI-3 P-cable consists of 68 conductors:
16 data lines
9 control lines
2 parity lines
7 ground, reserved, or special signal lines
A-cable The SCSI-2 A-cable consists of 50 conductors:
8 data lines
9 control lines
1 parity lines
7 ground, reserved, or special signal lines
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