IBM SY44-5902-05 manual Cpi. See characters per inch

BSC. Binary synchronous communications. A form of telecommunication line control that uses a standard set of transmission control characters and control character sequences, for binary synchronous transmission of binary coded data between stations.

BTM. Bus transport message.

basic assurance test. An automatic test to test the I/O processor.

browse. To look at records in a file. To rapidly scan information on the screen of a visual display unit by vertical scrolling.

card enclosure. The area that contains the logic cards.

CD. (1) In data communications, carrier detector. See also RLSD. (2) In storage media, compact disk. See also CD-ROM.

CD-ROM.Compact disk-read only memory.

CEC. (1) In data communications, connect data set to line. (2) Central electronics complex (formerly called central processing unit or CPU). (3) Card enclosure cage.

checksum. A utility that writes data in a sector for error detection purposes.

CI. (1) In data communications, calling indicator. (2) Callable interface.

CID. In data communications, cable identification (ID) usually for a common return.

CLK. In data communications, clock.

CNTL A, B. In data communications, Control A or B. A and B refer to each individual signal of a differential pair of signals.

collision wrap. A method of testing the power, ground, and signal lines on the interface of an Ethernet adapter. This test requires the use of specialized wrap connectors.

concurrent maintenance. The process of removing or replacing hardware while the system is in use.

configure. To describe to a system the devices, optional features, and programs installed on the system.

confirm. To remove doubt about any authoritative act or indisputable fact.

cpi. See characters per inch.

CPM (continuously powered main storage). Continuously powered main storage. When utility power is lost on some iSeries models with SPCN, the system applies power only to the main storage cards

for a varied amount of time (for example, one day). This process is called continuously powered main storage (CPM).

CPM increases the system availability. It provides full operating power for a short time to allow a system shut-down procedure. CPM allows the customer data to be stored and minimizes recovery time.

CRQ. (1) In data communications, call request. (2) Change request.

cryptography. A method of transforming customer data to conceal its meaning. Cryptographic services include data encryption and message

CTL A, B. In data communications, control. See CNTL.

CTS, CTSA, CTSB. In data communications, clear to send (A and B refer to each individual signal of a differential pair of signals).

CTSB. In data communications, clear to send B.

DASD. Direct access storage device.

dc. Direct current.

DCE. In data communications, data communications equipment.

DCLK, DCLKA, DCLKB. In data communications, data clock (A and B refer to each individual signal of a differential pair of signals).

DDI. Distributed data interface. The term DDI is used to represent all local area network (LAN) types based on the fiber distributed data interface (FDDI) specifications, regardless of the media used (optical fiber, copper, or shielded twisted pair).

DE. See disk enclosure.

debug. To check diagnose and eliminate errors in programs.

debug mode. An environment in which programs can be tested.

dedicated service tools (DST). The part of the service functions used to service the system.

disk enclosure. The part of a disk unit that contains the read and write heads, the magnetic disks, and the actuators.

DLO. (1) In data communications, data line occupied.

(2) Document library object.

DMA. Direct memory access channel (hardware for I/O device access to main storage).

download. To transfer data from a processing unit to an attached device, such as a microcomputer, for processing.

326Service Functions V5R2