IBM 5251 11 Maintenance Information Manual page 14

retrace lines: Refer to reference 156.
retry: Sending frames of information a number of times
by the controller until received by the display station
without an error.
ripple level: A voltage measurement.
rolling: Pertains to movement of a display screen;
either horizontally, vertically, or a combination of both.
ROS: Read only storage.
rt adj: Right adjust.
serdes: Serializer / deserializer.
serializer/deserializer (serdes): A register that is used
to send data from the display station to the controller,
one bit at a time.
setup: Preparing a device for operation.
sign-on: The procedure performed at a display station
that can include entering the sign-on command, a
password, or other user specified security information.
stabilizer: Refer to reference 134.
stat addr: Station address.
stem: See key stem.
synchronization: Two or more events occurring at the
same time.
SVCS: Services.
Sys Req: The Sys Req key is used to enter a request
directly to the system.
TB: Terminal block.
template: Refer to reference 143.
Terminator switch: A switch used to terminate the
twinaxial cable at the last display station or printer in a
series. This switch is a part of the Cable Thru feature
on a display station.
theory: A section of this manual that includes data
flow, functional units,. and features.
twinaxial cable: A twisted-pair shielded cable that
connects a display station or printer to a controller.
typamatic key: A repeat-action key on the keyboard.
underscore: An attribute of a display field that places a
line under all positions of the field.
US: United States.
V-type display assembly: Refer to reference 150.
Vac: Volts alternating current.
Vdc: Volts direct current.
video: Pertains to the display screen image.
yoke: Refer to reference 150.
YY /MM/DD: Year, month, and day.
Glossary of Terms and Abbreviations 5251 MIM xv
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