IBM 3745 Connection And Integration Manual page 154

data terminal equipment (DTE). That part of a
data station that serves as a data source, data
link, or both, and provides for the data
communication control function according to
protocols. For example, the 3745 can be a DTE.
dependent logical unit (DLU). Any logical unit
(LU) that is made active by a command from the
host system over a data link. Such logical units
can be used only as secondary logical units, and
can have only one active LU-to-LU session at a
time. Contrast with independent logical unit.
direct attachment. The attachment of a DTE to
another DTE without a DCE.
diskette. For IBM 3745 control panel, a thin,
flexible magnetic disk, and its protective jacket,
that records diagnostics, microcode, and files.
Diskette size is 5"25. For the service processor
the diskette size is 3"5.
Distributed Console Access Facility (DCAF).
An IBM licensed program that lets a user at one
workstation to remotely monitor, control, and
operate another workstation.
extended binary-coded decimal interchange
code (EBCDIC). A coded character set of 256
8-bit characters.
electrostatic discharge (ESD). An undesirable
discharge of static electricity that can damage
equipment and degrade electrical circuitry.
emulation program (EP). An IBM control
program that allows a channel-attached 3705 or
3725 communication controller to emulate the
functions of an IBM 270x device. See also NCP.
enterprise system connection (ESCON). A set
of IBM products and services that provides a
dynamically connected environment within an
enterprise.
ESCON channel. A channel having an
Enterprise System Connection
channel-to-control-unit I/O interface that uses
optical cables as a transmission medium.
ESCON channel adapter (ESCA). A
communication controller hardware unit used to
attach the controller to a host via ESCON fiber
optics. An ESCA consists of an ESCON channel
processor and an ESCON channel coupler.
X-4
3745 All Models & 3746-900: CIG
Ethernet LAN adapter (ELA). Line adapter for
Ethernet-type network, composed of one
communication scanner processor card (CSP),
and one Ethernet adapter card (EAC).
high-speed scanner (HSS). Line adapter for
lines speeds up to 2 mbps. It is composed of a
communication scanner processor (CSP) and a
front-end high-speed scanner (FESH).
host processor. (1) A processor that controls all
or part of a user application network. (2) In a
network, the processing unit in which the access
method for the network resides. (3) In an SNA
network, the processing unit that contains a
system services control point (SSCP). (4) A
processing unit that executes the access method
for attached communication controllers. Also
called host.
IBM service representative. An individual in
IBM who does maintenance services for IBM
products or systems.
initial program load (IPL). The initialization
procedure that causes the 3745 control program
to begin operation.
input/output control (IOC). The circuit that
controls the input/output from/to the channel
adapters and scanners via the IOC bus.
integrated services digital network (ISDN). A
digital end-to-end telecommunication network that
supports multiple services including, but not
limited to, voice and data.
internal clock function (ICF). A LIC function
that provides a transmit clock for sending data,
and retrieves a receive clock from received data,
when DCEs or direct-attached terminal do not
provide those timing signals.
international organization for standard (ISO).
An organization of national standards bodies from
various countries established to promote
development of standards to help international
exchange of goods and services, and develop
cooperation in intellectual, scientific, technological,
and economic activity.
International Telecommunication Union -
Telecommunication (ITU-T). The specialized
telecommunication agency of the United Nations,