The CCITT considering: (a) that Recommendation X.1 specifies the user classes of service applicable to networks offering public data services; (b) that Recommendation X.2 specifies the international user services and facilities to be offered by public data networks; (c) that Recommendations X.21 and X.21 bis define the DTE/DCE interface for circuit switched services; (d) that Recommendation X.60 specifies the common channel signalling for synchronous data networks; (e) that Recommendation X.71 specifies the channel associated signalling for synchronous data networks; (f) that Recommendation X.92 specifies the hypothetical reference connections for public data networks; (g) that Recommendation X.110 specifies the routing plan to be applied in the international portions of public data networks; (h) that Recommendation X.213 specifies the OSI Network Layer service; (i) that Recommendation X.140 specifies the user-oriented quality of service parameters applicable to data services.
ITU-T X.130 FRENCH-1988 Referenced Document
ITU-T X.21 Interface between Data Terminal Equipment and Data Circuit- Terminating Equipment for Synchronous Operation on Public Data Networks (Study Group VII) 58 pp*， 1992-01-01 Update
ITU-T X.130 FRENCH-1988 history
1988ITU-T X.130 FRENCH-1988 CALL PROCESSING DELAYS IN PUBLIC DATA NETWORKS WHEN PROVIDING INTERNATIONAL SYNCHRONOUS CIRCUIT-SWITCHED DATA SERVICES