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Systems Network Architecture (SNA). The description
of the logical structure, formats, protocols, and
operational sequences for transmitting information units
through and controlling the configuration and operation
of networks.
telecommunications network. In a telecommunication
system, the combination of all terminals and other
telecommunication devices and the lines that connect
them.
terminal. (1) A point in a system or communication
network at which data can either enter or leave.
(2) Any device capable of sending and receiving
information over a communication channel.
terminal-initiated logon. A logon request that originates
from the terminal.
translate table. For the 3708, a table that defines the
translation of ASCII to EBCDIC and EBCDIC to
ASCII and that allows the use of special characters and
nonstandard codes.
turnaround character. A character that uniquely
designates the end of a line of data, such as carriage
return (CR) or line feed (LF). The default for the 3708
is two characters.
unformatted display. A screen display in which no
attribute character (and, therefore, no display field) has
been defined.
unprotected field. A display field for which the display
station operator can manually enter, modify, or erase
data.
user-defined terminal. An ASCII display that is
attached to the 3708 and that operates in protocol
conversion mode using a keyboard mapping defined by
the user.
user-defined terminal table. A table that a customer
creates in storage, which contains information for a
keyboard mapping used to define a terminal.
wraparound. (1) (TC97) In computer graphics, the
display at some point on the display space of the display
elements whose coordinates lie outside of the display
space. (2) (TC95) In display-based word processing
equipment, the automatic disposition of a printable line
of text onto two or more display lines necessitated by
the horizontal limits of the display. (3) The
continuation of an operation from the maximum
addressable location in storage to the first addressable
location. (4) The continuation of register addresses
from the highest register address to the lowest.
write control character (WCC). A character used in
conjunction with a Write command to specify that a
particular operation, or combination of operations, is to
be performed at a display station or printer.
Write Structured Field (WSF) command. A command
used for processing structured fields.
3270 data stream. Data being transferred from or to an
allocated primary or tertiary device, or to the host
system, as a continuous stream of data and 3270
Information Display System control elements in
character form.
3270 data-stream compatibility (DSC). The facility that
provides access to System/370 applications that
communicate with 3270 Information Display System
terminals.
3708 Network Conversion Unit. A device that allows
ASCII devices to communicate with an SNA host by
providing protocol conversion and protocol enveloping
and that allows ASCII devices to communicate with an
ASCII host by providing ASCII pass-through.
Glossary
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