The CCITT,considering(a) that telex subscribers are often geographically located in small groups;(b) that TDM multiplexing systems are economical for the transmission of large numbers of channels;(c) that certain telex switches handle TDM frames in accordance with Series-R Recommendations directly and that frame fill should be optimized;(d) that telex switches handle channels at 50 bauds and a 7.5 unit code;(e) that a facility for regenerating start-stop signals is used in new TELEX networks;(f) that the branch-line multiplexing system should be capable of accepting and regenerating all the signals of the TELEX signalling system;(g) that the minimum signal transfer delay through TDM systems is achieved by the transmission of interleaved elements,recommendsthat,where banch-line remote or low multiplex capacity TDM systems are to be used for telegraphy,the equipment shall comply with the following standards.
ITU-T R.103 SPANISH-1988 Referenced Document
ITU-T R.101 Code and Speed Dependent TDM System for Anisochronous Telegraph and Data Transmission Using Bit Interleaving - Telegraphy Telegraph Transmission (Study Group IX) 18 pp*， 1993-01-01 Update
ITU-T R.102 4800 bit/s Code and Speed Dependent and Hybrid TDM Systems for Anisochronous Telegraph and Data Transmission Using Bit Interleaving - Telegraphy Telegraph Transmission (Study Group IX) 15 pp*， 1993-01-01 Update
ITU-T R.103 SPANISH-1988 history
1988ITU-T R.103 SPANISH-1988 CODE AND SPEED-DEPENDANT TDM 600 BIT/S SYSTEM FOR USE IN POINT-TO-POINT OR BRANCH-LINE MULDEX CONFIGURATIONS