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.