IBM 3174 Introduction

type 1 communication adapter. The 3174 adapter that
supports communication between the 3174 (and its
terminals) and a host
over telecommunication links
using any of these interfaces: (a)
EIA 232D/V.24 and
V.35
for SNA/SDLC, (b) SSC, and (c) X.25. The user
selects the appropriate interface.
type 2 communication adapter. The 3174 adapter, that
supports communication between the 3174 (and its
terminals) and a host over telecommunication links
using either the
X.21 interface for SNA/SDLC or the
X.25 interface. The user selects the interface.
u
update. In 3174 central site customizing, to tailor a
library member's customizing data, in working copy,
and put
it back to the library diskette.
upstream.
(1) In the direction opposite to data flow or
toward the source of transmission. (2) Toward the
processor from an attached unit
or end user.
(3) Contrast with downstream.
Utility (UTL) diskette. A diskette that contains the
microcode necessary to run
various utilities, for.
example, to copy portions of a diskette
for a backup
diskette.
v
V.3S communication adapter. A communication
adapter that can combine and send information on one
line at speeds up to
64 kbps, and conforms to the CCITT
V.35 standard.
w
workstation. An input/output device that allows
transmission of data
or reception of data as needed to
perform a job.
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.
x
X.21. In data communication, a recommendation of the
International Telegraph and Telephone Consultative
Committee
(CCITT) that defines the interface between
data terminal equipment and public data networks
for
digital leases and circuit switched synchronous
services.
X.21 communication adapter. A communication
adapter that can combine and send information on one
line at speeds up to
64 kbps, and that conforms to
CCITT X.21 standards.
X.2S. In data communication, a recommendation of the
CCITT that defines the interface between data terminal
equipment and packet switching networks.
3
3270 data stream. (1) The commands, control codes,
orders, attributes, and data
or structured fields for 3270
devices, that are transmitted inbound to an application
program
or outbound to a terminal. (2) 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 emulation. The use of a program that allows a
device
or system such as a personal computer or a
System/38 to operate in conjunction with a host system
as
if it were a 3270-series display station or control
unit.
Glossary
X-11

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English