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1991-12-31
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Recommendation S.140
Add the following terms and definitions:
721.32.01 function control
Control of an elementary operation to be performed by a device
other than recording or printing a letter, figure, punctuation mark
or graphic symbol contained in a message or in data.
721.32.02 function signal
A set of signal elements used to transmit a function control.
721.32.03 control character
A character whose occurrence in a particular context, initiates,
modifies or stops an operation.
Note 1 - A control character may be recorded for use in subsequent
action.
Note 2 - A control character is not a graphic character but may
have a graphic representation in some circumstances.
721.32.04 translation (in telegraphy and data transmission)
Function of a telegraph receiver in reestablishing the text of a
message from the received signal, including the recording of the
text.
721.32.05 selection (in a telegraph receiver)
Primary operation of translation, by which the control function or
thesymbol to be printed or translated is chosen automatically or
not, from the received signal.
721.32.06 local record
Display of a transmitted message made on a receiver associated with
the transmitting apparatus.
721.32.07 format effector
A function control used to insure a final lay-out of characters for
printing or display.
721.32.09 carriage return
A format effector that returns the printing or display position to
the commencement point of the line.
721.32.10 case shift
The change over of the translating mechanism of a telegraph
receiving apparatus from one case of character to the other case of
character.
721.32.11 letters case
One of the cases into which the characters, predominantly letter
characters and functions of a telegraph code with case shift are
grouped.
721.32.12 letters shift
A case shift resulting in a translation of signals as primary
characters predominantly letter characters, or functions of letters
case.
721.32.13 letter-shift signal
The signal which conditions a telegraph receiver to translate all
signals received as primary characters or functions or letters case.
721.32.14 figures case
One of the cases into which the characters, predominantly numerals
and signs, and functions of a telegraph code with case shift are
grouped.
721.32.15 figures shift
A case shift resulting in the translation of signals as secondary
characters, predominantly figure characters, or functions of figures
case.
721.32.16 figure-shift signal
The signal which conditions a telegraph receiver to translate all
signals received as secondary characters or functions of figures
case.
721.32.17 space signal
Signal corresponding to a code combination which causes the printing
position to be advanced by the character pitch without printing.
721.32.19 erasure signal
A signal used for the purpose of invalidating a previous signal.
721.32.20 "Who are you" signal (function); WRU signal
Signal corresponding to a code combination which, when received by a
telegraph terminal or data station causes an call-sign device to
transmit an call-sign.
721.32.21 call-sign; answer-back code
Unique sequence of characters identifying a particular telegraph
terminal or data station.
721.32.28 identification request
A transmission control used as a request for a response from a
remote terminal; the response may include the terminal
identification, or the state of the terminal.
721.32.35 device control
A function control designed to control certain ancillary equipments
associated with a terminal used in particular to switch such
equipments on or off.
721.32.40 warning signal
A function signal which operates an audible or visual calling device
with a view to attracting attention.
721.32.47 switching signal telex-data
A signal which switches a terminal from the telex mode to the data
transmission mode.
34.025 local end (with its termination)
That part of a connection including the apparatus, lines, telegraph
repeaters and any control units between the apparatus and the first,
or last point in that connection where the transmission quality can
be measured.