IBM 3745 Problem Determination Manual page 380

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network. See user application network.
Network Control Program (NCP). An IBM licensed
program that provides communication controller
support for single-domain, multiple-domain, and
interconnected network capability.
nonswitched line. A connection between systems or
devices that does not have to be made by dialing.
The connection can be point-to-point or multipoint.
The line can be leased or private. Contrast with
switched line.
operator console. The IBM Operator Console that is '
used to operate and service the 3745 through the
MOSS. A local console must be located within
7
m of
the 3745. Optionally an alternate console may be
installed up to 120 m from the 3745, or a
r~mote
console may be connected to the 3745 through the
switched network.
partitioned emulation programming (PEP) extension.
A function of a network control program that enables
a communication controller to operate some
telecommunication lines in network control mode
while simultaneously operating others in' emulation
mode.
Post Telephone and Telegraph (PTT). A generic term
for the government-operated common carriers in
countries other than the USA and Canada.
start-stop. A data transmission system in which each
character is preceded by a start signal and is followed
by a stop signal.
switched line. A transmission line with which the
connections are established by dialing, only when
data transmission is needed. The connection is
point-to-point and uses a different transmission line
each time it is established. Contrast with
nonswitched line.
Synchronous Data Link Control (SOLC). A discipline
for managing synchronous, code-transparent,
serial-by-bit information transfer over a link
connection. Transmission exchanges may be duplex
or half-duplex over switched or nonswitched links.
The configuration of the link connection may be
point-to-point, multipoint, or loop. SLDC conforms to
subsets of the Advanced Data Communication Control
Procedures of the American National Standards
Institute and High-level Data Link Control (HDLC) of
the International Standards Organization.
synchronous transmission. Data transmi ssion in
which the sending and receiving instruments are
operating continuously at substantially the same
frequency and are maintained, by means of
correction, in a desired phase relationship. Contrast
with asynchronous transmission.
systems network architecture (SNA). The description
of the logical structure, formats, protocols, and
operational sequences for transmitting information
through a user application network. The structure of
SNA allows the users to be independent of specific
telecommunication facilities.
time out. The time interval allotted for certain
operations to occur.
token.ring subsystem (TRSS). The part of the
controller that controls the data transfers over an IBM
Token-Ring Network.
The TRSS consists of up to four token-ring adapters
(TRAs).
token·ring adapter (TRA). Line adapter for IBM
Token-Ring Network, composed of one
token~ring
multiplexor card (TRM), and two token-ring interface
couplers (TICs).
The TRSS consists of up to four token-ring adapters
(TRAs).
transmission interface. The interface between the
controller and the user application network.
transmission line. The physical means for connecting
two or more DTEs (via DCEs). It can be nonswitched
or switched. Also called a line.
transmission subsystem (TSS). The part of the
controller that controls the data transfers over low-
and medium-speed, switched and non switched
transmission interfaces.
The TSS consists of:
• Low-speed scanners (LSSs) associated with
• L1Bs
• Serial links (SLs).
two.processor switch (TPS). A feature of the channel
adapter that connects a second channel to the same
adapter.
user application network. A configuration of data
processing products, such as processors, controllers,
and terminals, for the purpose of data processing and
information exchange. This configuration may use
circuit-switched, packet-switched, and leased-circuit
services provided by carriers or PIT. Also called a
user network.
V.24, V.25, V.25 bis, V.35. EIA/CCITT
recommendations on transmission interfaces
X.20 bis, 21, 21 bis, 21 native, 25. CCITT
recommendations on transmission interfaces
Glossary
X-7