direct-attached terminal do not provide those timing
signals.
line. See
transmission line.
line adapter (LA). The part of the TSS, HPTSS, or
TRSS that scans and controls 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 base (LIB). A board which houses:
One multiplexer
Up to eight LICs
line interface coupler (LIC). A circuit that attaches up
to four transmission cables to the controller (from DTEs,
DCEs or telecommunication lines).
line weight. A value (0.4 through 100) that represents
the percentage of scanner occupation. The total weight
of the lines connected to a scanner must be equal to or
less than 100.
Link Problem Determination Aid (LPDA). A series of
test commands executed by an IBM DCE to determine
which of various network components may be causing
an error in the network.
link protocol. The set of rules by which a logical data
link is established, maintained, and terminated, and by
which data is transferred across the link.
Logrec. Error logging file managed via the operating
system.
low-speed scanner. Line adapter for lines up to 256
kbps. It is 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 user'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). See DCE.
multiplexer channel. A channel designed to operate
with a number of I/O devices simultaneously. Several
I/O devices can transfer records at the same time by
interleaving items of data. See also
byte multiplexer,
block multiplexer.
multiplexing. The division of a transmission facility
into two or more channels by allocating the common
channel to several different channels, one at a time.
multipoint connection. A connection established
among more than two data stations for data
transmission. The connection may include switching
facilities.
NetView. An IBM licensed program used to monitor a
network, manage it, and diagnose its problems.
NetView Performance Monitor (NPM). An IBM
licensed program that uses VTAM to record
performance data collected for various devices in a
network.
Network Control Program (NCP). An IBM licensed
program that provides communication controllers
supports 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.
online tests. Testing of a remote data station
concurrently with the execution of the user's programs
(that is, with only minimal effect on the user's normal
operation).
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 remote
console may be connected to the 3745 through the
switched network.
owning host. A host which can IPL an 3745 and also
run application programs.
pacing. A technique by which a receiving station
controls the rate of transmission of a sending station to
prevent overrun.
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.
point-to-point connection. A connection established
between two data stations for data transmission. The
connection may include switching facilities.
Glossary
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