IBM System/36 Maintenance Information Manual page 144

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.