Glossary
This glossary deîš³nes the special terms, abbreviations, and acronyms that are used in this publication. If
you do not îš³nd the term that you are looking for, refer to the index or to the Dictionary of Computing,
1994.
Numbers
2:1 compression
The relationship between the quantity of data that can be stored with compression as compared to
the quantity of data that can be stored without compression. In 2:1 compression, twice as much data
can be stored with compression as can be stored without compression.
2.5:1 compression
The relationship between the quantity of data that can be stored with compression as compared to
the quantity of data that can be stored without compression. In 2.5:1 compression, two-and-a-half
times as much data can be stored with compression as can be stored without compression.
3U
This library requires 3 units (3U) of rack space.
A
A
Ampere.
AC
Alternating current.
Access method
A technique for moving data between main storage and input or output devices.
Accessor
This component contains the library robot and bar code reader. The accessor moves cartridges to and
from the I/O Station, storage slots, and tape drives.
Adapter card
A circuit board that adds function to a computer.
Adj
Adjustment.
Administrator (Admin)
The Admin role has access to all menus. The default password is adm001, and the default PIN is
0000.
AH
Authentication Header. An Internet Protocol intended to guarantee connectionless integrity and data
origin authentication of IP datagrams. Further, it can optionally protect against replay attacks by using
the sliding window technique and discarding old packets.
AIX
®
Advanced Interactive Executive. IBM's implementation of the UNIX operating system. The System p
system, among others, uses AIX as its operating system.
Alphanumeric
Pertaining to a character set that contains letters, numerals, and other characters, such as
punctuation marks.
Alter
To change.
206
IBM TS4300 Tape Library Machine Type 3555: User's Guide
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