(1) An orderly arrangement of
data in rows and columns that can contain numbers, text, or a combination of
both. The system-recognized identifier for the object type is
*TBL. See also conversion table.
(2) In COBOL, a set of logically
consecutive data items that are defined in the Data Division with the OCCURS
clause.
(3) In RPG, a series of elements with
like characteristics. A table can be searched for a uniquely identified
element, but elements in a table cannot be accessed by their position relative
to other elements. Contrast with array.
(4) In DB2 UDB for AS/400, a named
data object consisting of a specific number of columns and some unordered
rows.
table designator
In DB2 UDB for
AS/400, a column name qualifier that designates a specific object
table.
table element
In COBOL, a data
item that can be referred to in a table.
table file
In RPG, an input file
that contains a table.
table-reference character (TRC)
(1) In
Advanced Function Printing (AFP) support, an optional control character in
line data. The TRC identifies the font used to print the record and can
be used to select a font during printing.
(2) In a 3800
Printing Subsystem, a numeric character corresponding to the order in which
the names for the character-arrangement table have been
specified.
tables
Tables that store
resources used in the CICS system.
tab stop
In VisualAge RPG, a
control setting that determines if a control can be selected by using the tab
key.
tachometer
A part that determines
speed of rotation.
tag
(1) In
UIM, the actual statements of the UIM tag language. Tags describe the
actions, format, and data of the panel. Tags are used to define the
formatting of help information.
(2) In OSI, a type designation that is
associated with every ASN.1 type.
tag content
The text associated
with a tag.
tail
In REXX, the part of a
compound symbol that follows the stem. A tail can consist of constant
symbols, simple symbols, and periods.
tailored document
In the
OfficeVision program, a shell document to which variable data is
added.
tangent
In the GDDM function, the
single point at which a straight line meets a curve or
surface.
tape cartridge
A case containing
a reel of magnetic tape that can be put into a tape unit without stringing the
tape between reels.
tape controller
A logic card
located in some tape units that controls input/output tape devices and
synchronizes their operation with the operation of the system as a
whole.
tape drive
A device used to move
the tape and read and write information on magnetic
tapes.
tape file
A device file to
support a tape device.
tape library
A device that
includes a selection of cartridges in a common (secure) area within access of
one or more automated removable media (ARM).
tape mark
A unique mark written
on the tape to distinguish file boundaries.
tape reel
A round device on which
magnetic tape is wound.
tape unit
The physical enclosure
containing the tape drive.
tape volume
A single reel of
magnetic tape.
target
(1) In advanced
program-to-program communications, the program or system to which a request
for processing is sent.
(2) In DDM, the remote system where
the request for a file is sent.
(3) In SEU, a line command, such as B
(Before) or A (After), that specifies the destination for other line commands
such as C (Copy) or M (Move).
(4) In VisualAge RPG, a part that
receives a target event from a source part whenever the state of the source
part changes.
target data queue program
In
Client Access, a series of AS/400 programs that receive requests for data
manipulation from the source data queue program. Target data queue
programs also send data and replies (to previous requests) to the source data
queue program.
target directory
In VisualAge
RPG, the directory in which the compiled VRPG application is
stored.
target distributed data manager (TDDM)
In a
distributed data management network, programming support that translates the
DDM requests received from a source system into data management or SQL
requests on the target (or remote) system. Contrast with source
distributed data manager (SDDM).
target event
In VisualAge RPG, an
event that a target part receives whenever the state of a source part
changes.
target folder
In VisualAge RPG,
the folder where the application (composite project) will be
created.
target group
In the Application
Development Manager feature of theApplication Development ToolSet licensed
program, the final group to which a part can be
promoted.
target program
(1) In communications,
the program that is started on the remote system at the request of the source
system. Contrast with source program.
(2) In display station
pass-through, a program that runs on the remote system.
(3) In VisualAge RPG, the
object to be built by the project, such as a Dynamic Link Library
(DLL).
target recovery time
The amount
of time estimated by the system that it will need to recover access paths
during an initial program load (IPL) after an abnormal system end.
Actual performance may range around the
target.
target release
(1) The release of the
operating system on which a user intends to use an object being created, or
intends to restore or use an existing object.
(2) In upgrades, the VxRxMx
of software that is to be installed.
target system
(1) The system that
receives a request from another system to establish communications.
(2) In a distributed data
management (DDM) network, the system that receives a request from an
application program on another system to use one or more files located on the
target system. Contrast with source system.
(3) In upgrades, the planned
hardware configuration and software level which will exist when the upgrade is
completed.
(4) The system that receives
information in a network of systems that exchange objects and data.
Contrast with source system.
target table
In DataPropagator
Relational, the table to which data is copied.
tariff
The fee the
packet-switching data network charges a user for sending data. The
tariff is usually based on the number of packets sent over the
network.
task control
A CICS facility that
controls resources at task syncpoint and when a normal or abnormal end
occurs.
task swapper
A function,
introduced with DOS 5.00, that allows the user to switch from one
application to another without ending either application. With the task
swapper function, only one application is active at any time. The
active program is the application that is currently running; all other
applications are suspended until the user switches to that
application.
TB
See
terabyte (TB).
TC
See
test control (TC).
TCAM
See telecommunications
access method (TCAM).
TCB
See Trusted Computing
Base (TCB).
TCP
See Transmission Control
Protocol (TCP).
TCP/IP
See Transmission
Control Protocol/Internet Protocol
(TCP/IP).
TCP/IP Connectivity Utilities
The IBM
licensed program that provides a collective set of industrial communications
protocols to support connectivity functions for both local and wide area
networks.
TCS
See terminal control
system entry (TCS).
TCT
See Terminal Control
Table (TCT).
TCTUA
See Terminal Control
Table User Area (TCTUA).
TD
See
transient data (TD).
TDDM
See target distributed
data manager (TDDM).
TDF
See time differential
factor (TDF).
TDLC
See twinaxial data link
control (TDLC).
TE
See
terminal equipment
(TE).
technical information exchange (TIE)
A part of
the electronic customer support function that allows a user to send files to
and receive files from a remote support system, and to search for information
on a remote support system. The files are sent and received through a
remote support network.
technology-independent machine interface (TIMI)
The lowest visible
architectural layer of AS/400. TIMI defines the high-level machine
instruction set and application programming interface that is independent of
the underlying implementation. This allows the underlying hardware and
Licensed Internal Code to evolve over time to take advantage of technology
advances without affecting the user-level interface.
TEI
See terminal end-point
identifier (TEI).
telecommunications
(1) The
transmission of control signals and information between two or more locations,
such as by telegraph, radio, or television.
(2) The transmission of
data between computer systems over telecommunications lines and between a
computer system and remote
devices.
telecommunications access method (TCAM)
A
370-type access method used to transfer data between main storage and
terminals (local or remote) on an AS/400
system.
Telecommunication Standardization Sector (ITU-T)
The
Telecommunication Standardization Sector (ITU-T). Formerly known as the
International Telegraph and Telephone Consultative Committee (CCITT).
As of March 1, 1993, recommendations from this group will be known as ITU-T
Recommendations. Recommendations made before March 1, 1993, will
continue to be known as CCITT
Recommendations.
telephone call state
In
telephony, the condition of a telephone call that reflects what the past
action on that call has been and what the next set of actions may
be.
telephony
The use or operation of
systems for the transmission of voice or data communications between separate
points.
Telnet
In TCP/IP, an application
protocol that allows a user at one site to access a remote system as if the
user's display station were locally attached. Telnet uses the
Transmission Control Protocol/Internet Protocol as the underlying
protocol.
template
(1) A pattern to help the
user identify the location of keys on a keyboard, functions assigned to keys
on a keyboard, or switches and lights on a control panel.
(2) A special object used to create
new objects of the same type. The newly created object has the same
characteristics as the template.
(3) In REXX, a guide that allows
strings to be parsed by words (delimited by blanks), by explicit matching of
strings, or by specifying numeric
positions.
temporary group
A list of
existing calendars used to schedule items for a group of users in one
step. The list can be used in the current session only, after which the
list is deleted.
temporary library
A library that
is automatically created for each job to contain temporary objects that are
created by the system for that job. The objects in the temporary
library are deleted when the job ends. The system name for temporary
library is QTEMP.
temporary objects
Objects, such
as data paths or compiler work areas, that are automatically deleted by the
system when the operating system is
loaded.
temporary storage (TS)
The CICS
facility that allows application programs to store data in a temporary storage
queue for later retrieval.
temporary-text-delay (TTD) character
The BSC
transmission control character that tells the receiving station that there is
a temporary delay in sending the data.
tentative
In the OfficeVision
calendar function, pertaining to an event that is still not decided or not
confirmed. A person who has authority to someone else's calendar
can schedule only tentative events on that
calendar.
terabyte (TB)
1 099 511 627 776
bytes. On AS/400, a terabyte is represented by the value, *MAX1TB,
which is the maximum size of auxiliary storage that is allowed for an access
path associated with a file.
teraspace
A type of temporary
space that has a much larger capacity than other types of space.
Teraspace storage can be used for dynamic storage allocations.
term
A string, symbol, or
function call contained within a REXX
expression.
terminal adapter
A device that
connects a computer to an external digital communications line such as an
integrated services digital network (ISDN)
line.
terminal control
In CICS, a
facility that handles addressing, and transmission error detection and
correction for terminals (displays and printers) associated with the local
CICS system. It also handles the intercommunication data queue used by
CICS.
terminal control system entry (TCS)
A table
defining the connections between CICS
systems.
Terminal Control Table (TCT)
A table
describing the terminals and logical units within a CICS
network.
Terminal Control Table User Area (TCTUA)
An area
used to pass information between application programs, but only if the same
terminal is associated with the application programs
involved.
terminal end-point identifier (TEI)
A number
to identify the end point to the ISDN. Normally, assignment of the TEI
can be done automatically by the
ISDN.
terminal equipment (TE)
In an ISDN,
data terminal equipment (DTE) that provides the function necessary for the
operation of the access protocols by the user. See also terminal
equipment 1 (TE1) and terminal equipment 2
(TE2).
terminal equipment 1 (TE1)
Data
terminal equipment (DTE) with integrated ISDN support. In an ISDN, the
AS/400 system is a TE1. See also terminal equipment 2
(TE2).
terminal equipment 2 (TE2)
Data
terminal equipment (DTE) without an ISDN interface. To communicate with
other equipment through an ISDN, this equipment must have the protocol
converted to one that can be recognized by the network. For example, a
7820 ISDN terminal adapter may be used. See also terminal
equipment 1 (TE1).
terminating plug
A part that ends
the cable path on a computer system. The terminating plug is attached
to the last disk, diskette, or tape unit in a
series.
test
In communications, a data
link command or response used to perform a basic test of the
station-to-station link connection.
test condition
A statement that,
when taken as a whole, may be either true or false, depending on the
circumstances existing at the time the expression is
evaluated.
test control (TC)
A signal sent by
the data terminal equipment (DTE) to the attached data-circuit terminating
equipment (DCE) to signal a testing mode.
test library
A user-defined
library used for debugging operations that does not contain objects needed for
normal processing. Contrast with production
library.
test value
A value used to
compare for a specified condition.
text attribute
In the GDDM
function, characteristics of chart information, such as the color or type
style.
text box
In Client Access for
Windows, a box within a dialog box into which a user can type
information. The text box may be empty or may contain default
information when the dialog box first
appears.
text index entry
An entry for a
document in the text search index database. The text index entry is
used by the system to locate documents when doing a text
search.
text instruction
In the
OfficeVision program, an abbreviated command, preceded by an instruction
character, that produces a specified arrangement such as a numbered list of
information on a page, in a file, or on a display when the document is
processed.
text profile
In the OfficeVision
program, a description of formatting and editing options for creating a
document.
text search
In the OfficeVision
program, a type of search that allows the user to find documents that contain
one or more phrases within the document
content.
text search index database
The
database files used by text search services for storing the significant words
of documents. These database files are used when a user requests a
search of the document library for one or more
phrases.
text search services
The system
support that lets office users add, delete, and search for documents in the
text search index database. See also text search and
text search index database.
text stream
In the C language, an
ordered sequence of characters where each sequence or line is ended with a new
line control sequence and consists of zero or more
characters.
text transparency
In BSC, a
method of sending and receiving data containing any or all of the 256
character combinations in EBCDIC in specific bit patterns, including
transmission control characters. Transmission control characters sent
in the data are treated as specific bit patterns, unless they are preceded by
the DLE control character.
textual data
The collective term
for menus, displays, lists, prompts, options, online help information, and
messages. See also online
information.
TE1
See terminal equipment 1
(TE1).
TE2
See terminal equipment 2
(TE2).
TFTP
See Trivial File
Transfer Protocol (TFTP).
TG
See
transmission group (TG).
TH
See
transmission header (TH).
third-party plug-in
In Operations
Navigator, the support that allows users to install software from different
vendors.
thousands separator
The character
(comma in the United States) placed every third number starting left of the
decimal point. For example, three thousands separators are used in the
number: 641,322,974,821.
thread
(1) In the Distributed
Computing Environment (DCE), a single sequential flow of control within a
process.
(2) In the Integrated Language
Environment (ILE), the basic line of the running of a program.
(3) A stream of computer instructions
that is in control of a process. A multithread process begins with one
stream of instructions (one thread) and may later create other instruction
streams to perform tasks.
(4) In the OS/2 operating system, the
smallest unit of operation to be performed within a
process.
thread-capable
Pertaining to the
ability to create threads.
thread handle
In DCE Remote
Procedure Call (RPC), a data item that enables threads to share a storage
management environment.
thread ID
The unique integral
number that can be used to identify a thread. Thread ID is sometimes
used to describe the pthread_t data type that represents the abstraction to a
thread.
thread local storage
See
thread-specific
storage.
thread private storage
See
thread-specific storage.
threadsafe
(1) A function, macro, or
operating system service that can be called from multiple threads in a process
at the same time. A thread that cannot be called from multiple threads
is referred to as thread unsafe.
(2) A conditional form of thread
safety.
thread-specific storage
Storage
that is not shared among threads, but can be accessed by all functions within
that thread. In the industry, also called thread private
storage, thread local storage, or
TLS.
Threads Service
A Distributed
Computing Environment (DCE) component that supports the creation, management,
and synchronization of multiple threads within a single
process.
threshold
(1) A level set in the
system at which a message is sent or an error-handling program is
called. For example, in a user auxiliary storage pool, the user can set
the threshold level in the system values, and the system notifies the system
operator when that level is reached.
(2) In OSI, a user-specified value
that determines the frequency with which events will be reported. For
example, if a certain error threshold is set at 10, the error will not be
reported until the tenth occurrence of the
error.
threshold analysis
In Backup
Recovery and Media Services, the comparison of actual media statistics to
standard industry statistics for that
media.
threshold event
In OSI, an event
that occurs when a counter has reached its user-specified threshold.
OSI Communications Subsystem logs threshold events and generates messages to
the operator about these events.
threshold value
In the capacity
planning tool, a value used as a general guide for optimal resource
utilization. If resource utilization is above the threshold value, the
resource performance may be unacceptable. Threshold values are also
available for the rate of synchronous reads in the machine pool and for the
sum of all pools. Contrast with guideline
value.
throughput
(1) The measure of the
amount of work performed by a computer over a period of time, for example,
number of jobs per day.
(2) In data communications, the
total traffic between stations over a period of
time.
throughput class negotiation
(1) In
X.25, a packet-switching data network optional facility that allows the
data terminal equipment (DTE) to negotiate the speed at which its packets
travel through the packet-switching data network. See also
optional user facilities.
(2) In OSI, a
network layer facility that selects the speed with which data transmission
requests are to be handled.
thunking
In Client Access, the
process that occurs when a 32-bit application calls a 32-bit application
programming interface that is implemented by a 16-bit component of the
system.
tick
In Business Graphics
Utility, a reference point on either the vertical or horizontal axis of some
chart types that represents the location of specified data values. See
also major tick and minor
tick.
ticket
In DCE Security, an
application-transparent mechanism that transmits the identity of an initiating
principal to its target. See privilege ticket, service
ticket, simple ticket, and ticket-granting
ticket.
ticket-granting ticket
In DCE
Security, a ticket that allows access to the ticket granting service.
See ticketsimple ticket, privilege ticket,
and service ticket.
TIE
See technical
information exchange (TIE).
time
A three-part value or data
type that designates a time of day in hours, minutes, and
seconds.
time differential factor (TDF)
In the
DCE Distributed Time Service (DTS), the difference between coordinated
universal time (UTC) and the time in a particular time
zone.
time duration
A decimal number
that represents a number of hours, minutes, and
seconds.
time format
In the OfficeVision
program, a calendar value that identifies whether items are scheduled
according to a 12-hour clock or a 24-hour
clock.
time-independent messaging
In
MQSeries, a method of communication between programs in which the requesting
program proceeds with its own processing without waiting for a reply to its
request. Contrast with synchronous
messaging.
timemark
A specific period of
time that is allowed by the Telnet server to verify that a connection is still
active.
timeout
(1) An event that occurs at
the end of a predetermined period of time that began at the occurrence of
another specified event.
(2) A time interval that is allotted
for certain operations to occur, for example, a response to polling or
addressing before system operation is interrupted and must be
restarted.
time-out period
In the
Distributed Computing Environment (DCE), the amount of time in seconds that
the Control Task waits for a daemon to initialize successfully. If this
time elapses and the daemon does not indicate to the Control Task that is has
successfully initialized, the daemon's state is deemed to be
unknown.
time provider interface (TPI)
In the
DCE Distributed Time Service (DTS), an interface between the DTS server and
external time provider process.
time provider program
In the DCE
Distributed Time Service (DTS), an application that functions as a time
provider.
time provider (TP)
In the DCE
Distributed Time Service (DTS), a process that queries Universal Coordinated
Time (UTC) from a hardware device and provides it to the
server.
timer-related event
A CICS
interval control function that is used to support events that are delayed,
suspended, or restarted after a time
interval.
times authority
In the
OfficeVision calendar function, the authority that allows the user to display
the calendar name, description, and the times that are scheduled on another
user's calendar.
time-sharing
Sharing computer
time and resources.
time-sharing option
An operation
on the System/370 operating system that provides interactive processing time
for remote terminals.
time slice
The amount of
processor time (specified in milliseconds) allowed for a job before other
waiting jobs of equal priority are allowed to process
data.
time slicing
In the Distributed
Computing Environment (DCE), a mechanism by which running threads are
preempted at fixed intervals. This ensures that every thread is allowed
time to be run.
time stamp
(1) To apply the current
system time.
(2) The value of an object that
indicates the system time at some critical point in the object's
history.
(3) In Query, the identification
of the day and time a query report is created, which Query automatically
provides on each report.
timestamp
In AS/400 database
support, a seven-part value or data type that consists of a date and time,
expressed in years, months, days, hours, minutes, seconds, and
microseconds.
timestamp duration
A decimal
number that represents a number of years, months, days, hours, minutes,
seconds, and microseconds.
time to live
The time interval in
seconds that an entry can exist in the cache before the name server discards
it.
TIMI
See
technology-independent machine interface (TIMI).
title
In OSI, a permanent
identifier for an object.
title bar
The area at the top of
each window that contains the system-menu symbol or the name of the
window. In Client Access for Windows, the title bar may also contains a
Control-menu box and the maximize and minimize
buttons.
TLI
See transport layer
interface (TLI).
TLS
See thread-specific
storage.
toggle
(1) Pertaining to a switching
device, such as a toggle key on a keyboard, that allows a user to switch
between two types of operations.
(2) To switch between two modes;
for example, on a personal computer connected to a network, to switch between
the data entry and command entry modes or between stand-alone operation and
device emulation.
token
(1) A predefined message or
character pattern that gives the receiver of the token the permission to
transmit information.
(2) In OSI, an attribute of a
connection. The token is dynamically assigned to one session-service
user at a time to permit certain services to be called. Tokens are a
session layer concept. (I) See also data token,
synchronize/minor token, major/activity token, and
release token.
(3) The unit of low-level syntax from
which REXX clauses are built. Tokens include literal strings, operator
characters, and special characters.
(4) In CoOperative Development
Environment/400, a character string in a specific format that has some defined
significance in a programming language.
(5) In SQL, any single keyword,
user-supplied word, or arithmetic or comparison operator. See
delimiter token and ordinary
token.
token highlighting
A function of
CoOperative Development Environment/400 that allows a user to view different
programming language tokens in different colors or type styles. See
also token.
token-ring network
A local area
network that sends data in one direction throughout a specified number of
locations by using the symbol of authority for control of the transmission
line, called a token, to allow any sending station in the network (ring) to
send data when the token arrives at that
location.
token type
In CoOperative
Development Environment/400, a token or set of tokens having a similar
characteristic or function, and assigned the same display attributes by the
CoOperative Development Environment/400 program.
tool bar
In VisualAge RPG, a menu
that contains one or more graphical choices representing actions a user can
perform using a pointing device.
topic
In dynamic data exchange
(DDE), the data that is to be exchanged within a DDE
conversation.
top-level pointer
In DCE Remote
Procedure Call (RPC), a pointer parameter that in a chain of pointers is the
only member that is not the referent of any other
pointer.
topology
(1) The relationship of the
links and nodes of a network.
Note:
The synonym for topology is configuration. The term is
above the 16th-grade reading level. See also network chart
in the IBM
Dictionary of Computing.
(2) In communications, the physical
and logical arrangement of nodes in a
network.
topology database
(1) The
representation of the current topology of the intermediate routing portion of
the APPN network. The network topology database contains entries for
network nodes and the transmission groups interconnecting them. Each
entry describes the current characteristics of the node or transmission group
that it represents. The topology database is used to determine the
preferred session route between two end nodes for a given class of
service.
(2) In Managed System
Services, a set of database files that contain topology information and
general system information for nodes throughout the
network.
topology manager
A function of
the Managed System Services program that is responsible for collecting
topology information from nodes and clients in the network. The
topology manager can reside on any system in the network; however, this
system is most likely to be the central site
system.
total accumulator
In DFU, a
storage area where final totals for a field are kept. Contrast with
batch accumulator.
total record
In RPG, an output
record written after a group of detail records. Total records generally
contain data that is the result of calculations performed on the information
in a group of detail records. Contrast with detail
record.
total time
The part of the RPG
program cycle in which calculation and output operations specified for a group
of records are done. Contrast with detail
time.
tower
In the DCE Cell Directory
Service (CDS), a set of physical address and protocol information for a
particular server.
TP
(1) See
transaction program (TP).
(2) For the Distributed Computing
Environment (DCE), see time provider.
TPDU
See transport-layer
protocol data unit (TPDU).
TPI
See time provider
interface (TPI).
TPN
See transaction program
name (TPN).
TP server
In the DCE Distributed
Time Service (DTS), a server connected to a time provider
(TP).
trace
(1) A debugging aid for system
programmers and application programmers. It produces trace entries at
set system points or in response to trace commands.
(2) In REXX, a means of tracking the
interpretation of a program. Tracing is primarily used for
debugging.
track
A circular path on the
surface of a disk or diskette on which information is magnetically recorded
and from which recorded information is
read.
Traditional Chinese
The Chinese
character set expressed in traditional form. Traditional Chinese
characters are used in Taiwan, Hong Kong, and some other parts of the
world.
Traditional Chinese double-byte character set
An
IBM-defined DBCS for Traditional Chinese, consisting of Traditional Chinese
non-Chinese set, primary set, secondary set, and up to 2,632 user-definable
characters.
Traditional Chinese non-Chinese character set
A subset of
the Traditional Chinese DBCS, consisting of non-Chinese characters, such as
Greek, Russian, Roman numeric, alphanumeric and related symbols, Katakana,
Hiragana, special symbols and Chinese phonetic symbols. There are 675
characters in this set.
Traditional Chinese primary character set
A subset of
the Traditional Chinese DBCS, consisting of commonly used Chinese
characters. There are 5,401 characters in this
set.
Traditional Chinese secondary character set
A subset of
the Traditional Chinese DBCS, consisting of less commonly used Chinese
characters. There are 7,652 characters in this
set.
transaction
(1) An item of business,
for example, the handling of customer orders and customer billing.
(2) In CICS, a four-character
code (called a tranid) that is recognized by CICS.
(3) In the Distributed Computing
Environment (DCE), a unit of processing consisting of one or more application
programs that is initiated by a single request, often from a terminal.
(4) In the Integrated Language
Environment (ILE), a group of individual changes to objects on the system that
should appear as a single atomic change to the user.
(5) In communications, an
exchange between a program on a local system and a program on a remote system
that accomplishes a particular action or result. See also
conversation and session.
(6) In performance, a unit of
work used to express the throughput of a workload or to request the estimated
response time. An interactive transaction is the work done by the
system when the Enter key or a function key is pressed. A
noninteractive transaction is defined in terms of resource activity used by
the noninteractive jobs.
(7) In DB2 UDB for AS/400, the
work that occurs between begin unit of work and commit or rollback. A
transaction defines the set of operations that is part of an integral
set.
transaction code
For the IMS
subsystem, the first one to eight characters of the first segment of a message
sent to IMS/VS. The transaction code identifies the application program
for which the message is intended.
transaction consistent
In
DataPropagator Relational, a table that includes only committed
changes.
transaction dump
In CICS, a
formatted dump for the program active at the time the dump was
requested. A transaction dump indicates where the error occurred within
the program. See also
dump.
transaction file
(1) A file
containing data, such as customer orders, that is usually used only with a
master file.
(2) In COBOL, an
input-output file used to communicate with display stations and ICF
sessions.
transaction program name (TPN)
The name
by which each program participating in an LU 6.2 conversation is
known. Normally, the initiator of a connection identifies the name of
the program it connects to at the other LU. When used in conjunction
with an LU name, a TPN identifies a specific transaction program in the
network.
transaction program network
The
hierarchical structure of user or system transaction programs communicating at
a synchronization level of none, confirm, or commit. When the
synchronization level is commit, the transaction programs communicate over
protected conversations using the two-phase commit protocol. In this
case, the hierarchy consists of an initiator, optionally one or more cascaded
initiators, and agents.
transaction program (TP)
(1) A
user-supplied application program for processing data received by the AS/400
system from a finance device.
(2) A program that
processes transactions in an SNA network. The two kinds of transaction
programs are application transaction programs and service transaction
programs.
transaction routing
A CICS
facility that provides support for inbound and outbound terminal requests from
another CICS system connected by an advanced program-to-program communications
(APPC) link.
transceiver
In communications,
the device that connects the transceiver cable to the Ethernet coaxial
cable. The transceiver is used to transmit and receive
data.
transceiver cable
In
communications, the cable along with its connectors that connects the
input/output adapter to the transceiver.
transfer mode
Aspects covering
transmission, multiplexing, and switching in a communications
network.
transfer request
In Client
Access, a description of the file you want to transfer to your personal
computer from the AS/400 system or from your personal computer to the AS/400
system.
transfer syntax
(1) In DCE Remote
Procedure Call (RPC), a set of encoding rules used for transmitting data over
a network and for converting application data to and from different local data
representations. See also Network Data
Representation.
(2) In OSI, a set of rules
for the representation of user information while it is in transit between
presentation layer entities. The transfer syntax is usually derived
from the abstract syntax by use of encoding rules. Contrast with
abstract syntax.
transform
(1) To change the
composition of a data stream (AFP) to perform the same functions in a
different data stream (ASCII).
(2) In a Virtual Private Network
(VPN), a collection of authentication algorithms, Diffie-Hellman groups, and
encryption algorithms that are used during both phases of
negotiation.
transformer
A device that
converts power from one circuit to another at the same frequency, but at a
changed voltage and current.
transform service
A function of
the OS/400 operating system that converts PostScript Level 1 spooled files to
output. This output can be printed on either IBM Advanced Function
printers (OS/400 system printers) or Hewlett Packard Printer Control Language
printers (commonly used PC printers).
transient data (TD)
A CICS facility
that provides the user with the ability to read and write data in sequential
queues.
transient error
In OSI, an error
that occurs once or at unpredictable intervals--for example, network
congestion. Contrast with permanent
error.
transient event
In OSI, an event
that indicates the occurrence of an intermittent error or an error that can be
recovered through retry. Transient events are logged but do not result
in messages to the operator. Contrast with permanent
event.
transit delay processing
In OSI,
an X.25 quality-of-service function that keeps track of delays that
data encounters on the way to its destination. Any node that receives a
call packet can reject it if the transit delay exceeds the maximum specified
by the sender.
translator
An OS/400 component
that performs the final step in a program or module compilation. In the
Integrated Language Environment (ILE) model, this is called the optimizing
translator.
transmission control characters
In data
communications, special characters that are included in a message to control
communications over a data link. For example, the sending station and
the receiving station use transmission control characters to exchange
information; the receiving station uses transmission control characters
to indicate errors in data it
receives.
transmission control layer
In SNA,
the layer within a half-session that synchronizes and controls the speed of
session-level data traffic, checks sequence numbers of requests, and enciphers
and deciphers end-user data.
Transmission Control Protocol/Internet Protocol (TCP/IP)
(1) A set of
communications protocols that support peer-to-peer connectivity functions for
both local and wide area networks.
(2) The primary
communications protocol that is used on the Internet. TCP/IP could also
be used on an internal network.
Transmission Control Protocol (TCP)
In
TCP/IP, a host-to-host protocol that provides transmission in an internet
environment. TCP assumes Internet Protocol (IP) is the underlying
protocol.
transmission executive
A part of
the DSNX/PC licensed program that runs on the personal computer to control and
handle requests and to create responses for
DSNX.
transmission group (TG)
In SNA, a
group of links between directly attached nodes appearing as a single logical
link for routing messages. A transmission group may consist of one or
more SDLC links (parallel links) or of a single System/370 channel. For
type 2.1 nodes in AS/400 networks, a transmission group can only be a
single-link connection.
transmission header (TH)
In SNA,
control information, optionally followed by a basic information unit or a
basic information unit segment, that is created and used by path control to
route messages within the network.
transmission medium
In
communications, the physical path between transmitters and receivers in a
communications network, such as an Ethernet bus or a token
ring.
transmission queue
In MQSeries, a
local queue on which prepared messages destined for a remote queue manager are
temporarily stored.
transmission services profile
In SNA,
specified in a request to start a session. Each defined transmission
services profile is identified by a number. Abbreviated TS
profile.
transmission services (TS)
A
switched, nonswitched, or packet-switched communications line provided by a
vendor.
transmitted type
In DCE Remote
Procedure Call (RPC), for data types with the Interface Definition Language
(IDL) transmit_as attribute, the data type that stubs pass over the
network. See presented
type.
transparency
(1) A picture or text on
an acetate sheet designed to be viewed by light shining through it.
(2) In asynchronous
communications, a method of hiding certain ASCII control characters from
modems or asynchronous devices.
(3) For BSC, see
transparent text mode.
transparent data
Data that can
contain any hexadecimal value.
transparent text mode
In binary
synchronous communications, a method of transmission in which only
transmission control characters preceded by the DLE control character are
processed as transmission control
characters.
transport class negotiation
In OSI,
the process by which the peer application entities decide the Transport Layer
class to use on an association.
transport class 0
In OSI, the
simplest of five classes of service (0-4) or protocols defined in the
transport layer. (I)
transport class 2
In OSI, the
transport layer class that provides an intermediate level of
service.
transport class 4
In OSI, the
most complex of five classes of service (0-4) or protocols defined in the
transport layer. (I)
transport independence
In DCE
Remote Procedure Call (RPC), the capability, without changing application
code, to use any transport protocol that both the client and the server
systems support, while guaranteeing the same call semantics. See
transport layer and transport
protocol.
transport layer
In OSI
architecture, the layer that provides services for flow control and recovery
between open systems with a predictable quality of
service. (T)
transport layer interface (TLI)
In the
Distributed Computing Environment (DCE), an interface to the transport layer
of the OSI model, designed on the ISO transport service definition. See
also transport layer.
transport-layer protocol data unit (TPDU)
In OSI,
a protocol data unit in the transport
layer. (I)
transport-layer service access point (TSAP)
In OSI,
a service access point in the transport
layer. (I)
transport-layer service data unit (TSDU)
In OSI,
a unit of data transferred between the session layer and the transport
layer.
transport mode
In the OSI
Communications Subsystem licensed program, a set of values that determine the
transport layer functions to be used on an association. See also
transport mode name.
transport mode name
In OSI, the
name of a transport mode to be used for an association. The network
administrator specifies the transport mode name on an application mode.
See also transport mode.
transport protocol
A
specification of the rules that govern the exchange of information between
components of a transport network. For example, User Datagram Protocol
(UDP) is a transport protocol.
trap
(1) An unsolicited event
generated by an agent and forwarded to a manager. Traps inform the
manager of changes that occur in the network.
(2) In REXX, to recognize that a
currently enabled condition occurred and to perform the CALL or SIGNAL
instruction specified when the condition trap was
enabled.
TRC
See table-reference
character (TRC).
tree view
In VisualAge RPG, a way
of displaying the contents of an object in a hierarchical
fashion.
T reference point
In Performance
Tools, the interface between network termination 2 (NT2) and network
termination 1 (NT1). See also S reference point and S/T
interface.
tributary station
In data
communications, a secondary device on a multipoint
line.
trigger
A set of actions that are
run automatically whenever a specified change statement is issued to a
specified table or file. Triggers are often used to enforce business
rules, such as authority protection.
trigger action
A set of actions
(high-level language statements, SQL statements, or AS/400 utilities) that are
performed automatically when a specified change operation (trigger event)
occurs on a specified table or file. See trigger and
trigger event.
trigger event
(1) A change operation
that calls the trigger action to be run. The trigger event can be an
insert, update, or delete operation in any high-level language. See
trigger, trigger action, and trigger
event.
(2) In MQSeries, an event,
such as a message arriving on a queue, that causes a queue manager to create a
trigger message on an initiation queue.
triggering
In MQSeries, a
facility that allows a queue manager to start an application automatically
when predetermined conditions on a queue are
satisfied.
trigger level
In CICS, the number
of requests for output to a CICS transient data queue that must be reached
before automatic transaction initiation
occurs.
trigger message
In MQSeries, a
message that contains information about the program that a trigger monitor is
to start.
trigger monitor
In MQSeries, a
continuously running application that serves one or more initiation
queues. When a trigger message arrives on an initiation queue, the
trigger monitor retrieves the message. It uses the information in the
trigger message to start a process that serves the queue on which a trigger
event occurred.
trigger point
In REXX, a
threshold or boundary limit used in the REXX FORMAT
function.
trigger program
A program that
contains a set of trigger actions. See trigger and
trigger action.
trigger time
The time the trigger
action runs before or after the trigger event operates. See
trigger, trigger action, and trigger
event.
trigraph
In DB2 UDB for AS/400, a
sequence of 3 characters entered into a C-language source file to create a
character from the C-language character set that is not available on certain
keyboards. For example, the characters ??( are interpreted by the
compiler as a left bracket, [.
trimming
To remove a list entry
from the end of a list opposite from the end where the new entry was
added.
triplet
A length byte, a type
byte, and one or more parameter-value bytes in a Formatted Data Object Content
Architecture (FD:OCA)
descriptor.
Trivial File Transfer Protocol (TFTP)
In the
Internet suite of protocols, a protocol that transfers files between
hosts.
TRLAN
Abbreviation in the
commands, parameters, and options for IBM Token-Ring Network. See also
token-ring network.
truncate
(1) To cut off data that
cannot be printed or displayed in the line width specified or
available. Contrast with fold.
(2) To cut off data that does not
fit in the specified field length in a field
definition.
trunk
In telephony, circuits that
connect two switching systems, as opposed to connecting a customer line to a
switching system.
trunk line
A telecommunications
line that links a private telecommunications system to a public switched
network.
trusted
Pertaining to the control
of a security policy.
Trusted Computing Base (TCB)
The term
used by the U.S. Department of Defense to describe the
combination of hardware and software in a computer system that enforces a
unified security policy. See also
C2.
trusted root
In secure
communication, the public key and associated Distinguished Name of a
certificate authority.
trusted system
A system in a
network over which you have control of security. A trusted system can
directly communicate only with other systems in the
network.
trust peer
In the Distributed
Computing Environment (DCE), one side of a cross-registration that enables two
cells to have peer trust. See peer
trust.
TS
See
transmission services (TS) or temporary storage
(TS).
TSAP
See transport-layer
service access point (TSAP).
TSAP selector
In OSI, an external
identifier for a service access point at the Transport Layer. The TSAP
selector is part of a presentation address.
TSDU
See transport-layer
service data unit (TSDU).
TSO
See time-sharing
option.
TTD
See temporary-text-delay
(TTD) character.
tuning parameters table
In
DataPropagator Relational, a table at the data server that contains timing
information used by the change capture program. The information
includes how long to keep rows in the change data table, how long the time
delay can be between changes to the DB2 UDB log and the capture of those
changes by the change-capture program.
tunnel
An L2TP access
concentrator (LAC)-L2TP network server (LNS) pair. A tunnel carries
Point-to-Point Protocol (PPP) datagrams between the LAC and the LNS.
There may be many sessions in a single tunnel. A control connection
that operates in the tunnel controls the establishment, release, and
maintenance of sessions and the tunnel itself.
turnaround
In communications,
pertaining to changing a communications line from being able to send to being
able to receive, or from being able to receive to being able to
send.
turnaround time
In
communications, the time required to reverse the direction from sending to
receiving or from receiving to sending on a communications
line.
Tutorial System Support
An
education course, supplied with the operating system licensed program, that
provides introductory education for a variety of computer users, including
system operators and business and data processing professionals.
Tutorial System Support is part of the total IBM curriculum for the AS/400
system, which consists of classroom training and other methods of
self-study.
twinaxial cable
A cable made of
two twisted wires inside a shield that is used on the 5250 family
devices.
twinaxial data link control (TDLC)
A
communications function that allows personal computers, which are attached to
the work station controller by twinaxial cable, to use advanced
program-to-program communications (APPC) or Advanced Peer-to-Peer Networking
(APPN) support.
twisted-pair
Pertaining to a
transmission medium that consists of two insulated conductors twisted together
to reduce interference. For example, twisted-pair wiring can be used as
an alternative to twinaxial cable.
two-phase commit
(1) The protocol
that permits updates to protected resources to be committed or rolled back as
a unit. During the first phase, agents are asked if they are ready to
commit. If all agents respond positively, they are asked to commit
their updates. Otherwise, the agents are asked to roll back their
updates.
(2) A protocol that is used
by the sync point manager to commit a transaction when resources that are
managed independently are changed during the transaction. For example,
two-phase commit would be used when databases on multiple systems are
changed. If either the system or communications fail during a two-phase
commit, the changes are guaranteed to be committed or rolled back according to
the sync point manager's decision. See also one-phase
commit.
two-port communications adapter cable
A cable
that connects a 50-pin connector on a communications adapter card to two other
communications cables that have 25-pin connectors
(ports).
type
(1) In Java, a class or
interface.
(2) In the Application Development
Manager feature of the Application Development ToolSet licensed program, the
third qualifier of a part name that uniquely identifies a part within a
specific group by identifying the kind of information the part
contains.
(3) In DCE X/Open Object Management
(XOM), a category into which attribute values are placed on the basis of their
purpose. See attribute type.
typed data
In OSI, a data
transfer service provided by the session layer that enables an application
entity to send data whether or not it has permission to
send.
types
In OSI, a synonym for
ASN.1 types.
type UUID
In DCE Remote Procedure
Call (RPC), the Universal Unique Identifier (UUID) that identifies a
particular type of object and an associated manager. See also
manager and object.