1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 3 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(9!,0(!“%4)#!,G0G04%,%2!0(G0G04%2-).!,%15)0-%.434!.$!2$):!4)/.G0G0/ amended at New Delhi 1960, Geneva, 1964, 1976 and 1980)The CCITT,unanimously declares the view(1) that the number of characters that
2、the line of text in page-printing equipment may contain should be fixedat 69;(2) that tape- or page-printing start-stop equipment should, with a view to interworking, be fitted with:a) two keys for the transmission of the carriage-return and line- feed signals;Note New equipment may, in addition, be
3、 fitted with a single key for both carriage-return and line-feed,in accordance with the procedures described in Recommendation F.60 1.b) means to draw attention of the operator to the need to transmit carriage-return and line-feed signals in timeto prevent overprinting on the 69th character;Note New
4、 equipment may, in addition, be fitted with means preventing the input of any printing characterafter the 69th character of a line. This condition is signalled to the operator optically and/or acoustically.The carriage-return function cancels the signal and releases the input of characters.(3) that
5、for controlling the alarm, several “figures J” signals, one carriage-return signal and one line-feed signalshould be transmitted in the order indicated;(4) that such Administrations as are desirous of confirming on a tape machine the reception or transmission ofthe carriage- return and line-feed sig
6、nals shall effect this confirmation by printing:a) the symbol for the carriage-return signal;b) the symbol for the line-feed signal;(5) that, if the printing of the symbols indicated in 4 above is not desired, the reception of at least one ofthese signals shall nevertheless cause the paper to move forward. When only one of these signals causes the paper tomove forward, it should preferably be the line-feed.Reference1 CCITT Recommendation Operational provisions for the international telex service, Rec. F.60.
