IBM SY44-5902-05 manual Type D IPL. See installation IPL

SUID. System-unique identifier. A 12–character ID that is assigned by the iSeries manufacturer to support SOM software functions.

system ASP. The auxiliary storage pool where system programs and data reside. It is the storage pool that is used if the user does not define a storage pool. See also auxiliary storage pool and user ASP.

Systems Network Architecture. The description of the logical structure, formats, protocols, and operational sequences for transmitting information units through and controlling the configuration and operation of networks.

system reference code. A group of characters that identifies the machine status or a specific error condition. The system reference code can be displayed on the console from the problem log.

task. One or more sequences of instructions that are treated by a control program as an element of work to be accomplished. The basic unit of work from the standpoint of a control program.

TCLK. In data communications, transmit clock.

TD. In data communications, transmitted data. Also labeled XD.

TDE. Task dispatching element.

TI. In data communications, test indicator.

TSET. In data communications, transmitter signal element timing.

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

type D IPL. See installation IPL.

UA. (1) Unit address. (2) User agent.

Unattended IPL. An initial program load that is done automatically by the system after the system power is on.

UEPO. Unit emergency power off.

upgrade. To change or add to the system; to add devices, features, or programs.

uninterruptible power supply. A battery installed between commercial power and the system that provides power to keep the system running, if a commercial power failure occurs, until it can complete an orderly end to system processing.

URC. Unit reference code.

user ASP. One or more auxiliary storage pools used to isolate journals, journal receivers, and save files from

the other system objects that are stored in the system ASP. See also auxiliary storage pool and system ASP.

vital product data. A structured description of a device or program. For devices, it is recorded in the device at manufacture and includes at least the type, model, serial number, and installed features. It may include the manufacturer’s ID and other fields. For programs, it is compiled as a data area that accompanies the program. Data includes the name of the licensed program or Licensed Internal Code group, the release and modification, the program module names, the national language or languages selected, and possibly other fields. Vital product data is transferred from the device to the system and kept for display. Vital product data is also visible on the device name plate or a similar tag.

volume table of contents (VTOC). An area on a disk or diskette that describes the location, size, and other characteristics of each file, library, and folder on the disk or diskette.

VPD. See vital product data.

VTOC. See volume table of contents.

word. 4 bytes.

XD. In data communications, transmitted data. Also labeled TD.

X.25. In data communications, a specification of the International Telegraph and Telephone Consultative Committee (CCITT) that defines the interface to an X.25 (packet-switching) network.

330Service Functions V5R2