Glossary
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Glossary–3
I
IOCB
Input/Output Control Block
I/O module (IOM)
(1) A hardware module that interfaces with the I/O subsystem and schedules tasks by
using a message protocol. (2) A group of units that control input/output on a system,
including the task control unit (TCU), input/output unit (IOU), channel manager facility
(CMF), and interface adapters (IAs).
I/O unit (IOU)
A component of the I/O module that provides input/output support functions for the
master control program (MCP).
instruction processor (IP)
See central processor module (CPM).
J
JTAG
Joint task access group
K
KIOB (I/O Bridge)
A component of the I/O module that provides logic for moving data to and from the
memory subsystem.
L
LAN
Local area network
M
MAINTLAN
Maintenance local area network
Mb
Megabit
MB
Megabyte
MLI
Message level interface
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