<networking> (HDLC) A general-purpose data link control
protocol defined by ISO for use on both point-to-point and
multipoint (multidrop) data links. It supports
full-duplex, transparent-mode operation. It is used
extensively in both multipoint and computer networks.
Some manufacturers and other standards bodies still use their
own acronyms, e.g. IBM's SDLC (Synchronous Data Link
Control), the forerunner of HDLC and ANSI's ADCCP
(Advanced Data Communications Control Procedure).
[Fred Halsall, "Data Communications, Computer Networks and
Open Systems" 4th edition, 1996, p.237, Addison-Wesley
Publishing Co. Reading, Mass., USA].
(1997-11-09)
Nearby terms:
Higher Education National Software Archive « higher-order function « higher-order macro « High-level Data Link Control » high-level language » high memory area » high moby
high-level language definition
(HLL) A programming language which provides some level of
abstraction above assembly language. These normally use
statements consisting of English-like keywords such as "FOR",
"PRINT" or "GOTO", where each statement corresponds to several
machine language instructions. It is much easier to program
in a high-level language than in assembly language though
the efficiency of execution depends on how good the compiler
or interpreter is at optimising the program.
Rarely, the variants "VHLL" and "MLL" are found.
See also languages of choice, generation.
(1994-12-07)
Nearby terms:
higher-order function « higher-order macro « High-level Data Link Control « high-level language » high memory area » high moby » High Performance Computing and Communications
