COMMTEST. Communications concurrent
diagnostic test (procedure).
See
also
BSCTEST,
SDLCTEST,
and
ST
A TEST.
completion code.
See
condition code.
condition code. A code that shows the results
of
a
processing operation.
configure. To make or describe a configuration.
control panel. A panel that contains keys, lights,
and displays used by the operator (for normal
operation) and by
the.
service representative (for
system maintenance).
control storage directory. An area on disk that
contains the address
of
all programs in the control
storage library.
control storage library. An area on disk
that
contains the diagnostic programs that are loaded to
control storage.
CRC. Cyclic redundancy check (character).
CRQ. Call request.
CSP. Control storage processor.
CSu.
Customer setup.
CTS. Clear to send.
customize. To update the unit definition table and
system microcode on disk.
See
also system
customize utility.
cycle steal. The process by which a device uses
cycles
of
another machine or device. If, for
example, the processing unit
is
performing an
ALU
operation when the disk needs service, the ALU
operation
is
stopped while a byte
of
data is moved
to
or
from the disk.
cyclic redundancy check character. A character
code used for error sensing and correction.
cylinder. In disk and diskette storage devices, a
cylinder contains all the data under all heads
without moving the actuator or the head and
carriage assembly.
D-2
5363
Maintenance Information
data set ready. A communications signal that
indicates that the modem
is
ready to transmit or
receive data.
data terminal equipment. The processing unit that
uses data communications lines.
data terminal ready. An EIAjCCITT interface line
that signals the modem when the terminal
is
ready
to transmit or receive data.
dB. Decibel.
DBI.
Data
bus in.
dBm. Decibel based
on
one milliwatt.
DBO.
Data
bus out.
DCE.
Data
communications equipment.
DCP. Diagnostic control program.
DDSA. Digital
Data
Service Adapter.
DE. Disk enclosure.
decibel. A unit
of
measure that is the ratio
of
two
power or voltage levels.
dedicated.
(1) Pertaining to one application or
purpose.
(2)
A time during maintenance when no
customer jobs are running.
defect.
(1)
A failure. (2) A bad area on a disk,
diskette,
or
tape surface. (3) An error in a released
program or program module.
determination.
See
problem determination.
diagnostic control program. The supervisor program
that controls diagnostic programs.
Digital Data Service Adapter. In data
communications, a device used in place of a modem
when transmitting data over the AT&T Digital
Data
Service Network. (A DDSA can also
be
used
for local connections.)
directory.
See
control storage directory and diskette
directory.
disk enclosure. The sealed unit
of
the disk storage
device
that
contains the disks, the spindle, and the
actuator.
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