IBM 3745 Problem Determination Manual page 379

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.
direct attachment. The attachment of a DTE to
another DTE without a DCE.
diskette.· A thin, flexible magnetic disk, and its
protective jacket, that records diagnostics, microcode,
and 3745 files.
diskette drive. A mechanism that reads and writes
diskettes.
DOSNS. Disk Operating SystemlVirtual Storage.
duplex transmission. 'Data transmission in both
directions at the same time. Contrast with half
duplex.
Emulation Program (EP). An IBM licensed program
that allows a channel-attached communication
controller to emulate the functions of an IBM 2701
Data Adapter Unit, an IBM 2702 Transmission Control,
or an IBM 2703 Transmission Control.
Ethernet LAN adapter (ELA). Line adapter for
Ethernet-type network, composed of one
communication scanner processor card (CSP), and·
one Ethernet adapter card (EAC).
Ethernet-type subsystem (ESS). The part of the
controller that controls the data transfers over an
Ethernet V2 or IEEE 802.3 local area network.
front-end scanner (FES). A circuit that scans the
transmission lines, serializes and deserializes the
transmitted characters, and manages the line
services. It is part of the scanner.
half-duplex transmission. Data transmission in either
direction, one direction at a time. Contrast with
duplex.
high-performance transmission subsystem (HPTSS).
The part of the controller that controls the data
transfers over the high-speed transmission interface
(speed up to 2 million bps).
The HPTSS consists of up to eight high-speed
scanners (HSSs).
high-speed scanner. line adapter for lines up to 2
million bps, 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
. performs maintenance services for IBM products or
systems.
initial microcode load (IML). The process of loading
the microcode into a scanner or into MOSS.
initial program load (IPL). The initialization procedure
that causes 3745 control program to commence
operation.
LIB. A line interface base which houses:
• One multiplexer
• Up to eight L1Cs.
line. See transmission line.
line adapter (LA). The part of the TSS, HPTSS, or
TRSS that scans and cont.rols the transmission lines.
Also called scanner.
For the TSS the line adapters are low-speed scanners
(LSSs).
For the HPTSS the line adapters are high-speed
scanners (HSSs).
For the TRSS the line adapters are token-ring
adapters (TRAs).
line interface coupler (LIe). A circuit that attaches up
to four transmission cables to the controller.
Link Problem Determination Aid (LPDA.t). A set of
test facilities resident in the IBM 386X/586X modems
and activated from the control program in the
controller and from host.
low-speed scanner. Line adapter for lines up to 256
kbps, composed of a communication scanner
processor (CSP) and a front-end low-speed scanner
(FESL).
maintenance and operator subsystem (MOSS). The
part of the controller that provides operating and
servicing facilities to the customer's operator and the
IBM service representative.
microcode. A program, that is loaded in a processor
(for example, the MOSS processor) to replace a
hardware function. The microcode is not accessible
to the customer.
modem (modulator-demodulator). A functional unit
that transforms logical signals from a DTE into analog
signals suitable for transmission over
telecommunication lines (modulation), and conversely
(demodulation). A modem is a DCE. It may be
integrated in the DTE. ,
NetView. An IBM licensed program used to monitor
a network, manage it, and diagnose its problems.
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IBM 3745
Communication Controller: Problem Determination Guide