Users Guide

Glossary
This glossary denes the special terms, abbreviations, and acronyms that are used in this publication. If
you do not nd 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.
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
The Administrator role has access to all menus. The default password is secure, and the default PIN
is 0000.
AES
Advanced Encryption Standard. A data encryption technique that improved upon and ofcially
replaced the Data Encryption Standard (DES).
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.
ambient temperature
The temperature of air or other media in a designated area, particularly the area that is surrounding
equipment.