Texas Instruments 990 User Manual page 255

Glossary
DSR (device service routine)
FCCC
HDLC
LCI
A program that provides the software interface by servicing
interrupts and performing input and output operations
between a device and the system software. The
communications package includes a special DSR that provides
the TILINE interface between the CPU and the FCCC card.
The Four Channel Communications Controller
provides' the electr ical interface between
station and' the communications line.
board that
the primary
An abbreviation for High Level Data Link Control.
The logical channel identifier is made up of a
(Virtual Channel Group/Logical Channel Number)
assigned when the NETGEN program is executed.
VCG/LCN
that is
LLM (local line module)
A CRU device installed in the computer chassis that provides
the physical interface for TX5 secondary stations to the
network.
LUNO (logical unit number)
Modem
A number which specifies the device for an input/output
operation.
A device which (1) converts a digital waveform to an analog
waveform suitable for transmission, and (2) converts the
received analog waveform to digital during reception.
Multipoint line
A single communications line that connects several secondary
stations to one primary station. All secondary stations on
the same multipoint line are connected to the same FCCC port
in the primary station.
Network
A configuration of primary
interconnected by cables.
and secondary stations
NetwOrk Generator Programs - NETGEN and TXNETGEN
The programs that create the network information table (NIT)
entries. NETGEN creates the NIT entries for the primary
station that identify secondary stations and primary
applications programs that use the communications package.
TXNETGEN creates the NIT entries for the secondary stations
that identify secondary task that use the communications
package.
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Glossary-3