RTS. Request to send.
RWS. Remote work station.
SA. Service aid.
SDLC. Synchronous data link control.
SDLCTEST. SDLC online test (procedure).
See
also
BSCTEST,
COMMTEST,
and
STATEST.
SETCOMM. Set communications (configuration
procedure).
See
also ALTERCOM,.
SLCA. Single-line communications adapter.
SNA. Systems network architecture.
SNA profile. A description
of
the characteristics
of
a systems network architecture protocol.
SNBU. Switched network backup.
spindle. The shaft that turns the disk.
SRC. System reference code.
SSA. Sequential sector address.
SSP. System support program product.
STATEST. Station test (procedure).
See
also
BSCTEST,
COMMTEST,
and
SDLCTEST.
supervisor call. An instruction that causes control
to be passed to the control storage processor.
SVC. Supervisor call.
switched network backup. In data communications,
an alternative method
of
connecting two systems
over telephone lines when the primary method
of
connection
is
by leased lines.
synchronous data
link control. Rules that control
data movement over a communications line
connecting two devices that use a communications
adapter.
Sys Req. System Request (key).
system customize utility. A utility under dedicated
DCP that lets you update the system microcode on
disk, using the diagnostic diskettes.
system reference code. A 4-character code displayed
as part
of
a system message, as part
of
a diagnostic
message, or displayed in the control panel display.
systems network architecture. An IBM
communications protocol for controlling
information transfer in a data communications
network.
SYSTEST. System test.
task. A unit
of
work.
TB. Terminal block.
TCC. Top card connector.
TDS. Transmit data space.
Tektronix. Trademark of Tektronix, Inc.
template. An overlay panel used as a mask to
interpret the communications line status or autocall
status displayed in the 4-character display on the
control panel.
TESTREQ. Test request (procedure).
TI. Test indicate.
TP. Test point.
trade.
See
World Trade.
TV.
Test unit.
twinaxial cable. A twisted-pair shielded cable that
connects a keyboard/display or work station printer
to the system.
UDT. Unit definition table.
undervoltage. A condition that occurs when power
supply voltage
is
too low.
unit definition table. An area on disk
or
in storage
that contains entries that describe the devices that
run under control
of
the
SSP.
UV. Undervoltage.
V.
Volt.
Vac. Volts,
alternating current.
Appendix D. Glossary D-5
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